derek.holloway
7502bf64a4
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489 lines
12 KiB
LLVM
489 lines
12 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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define i1 @test1(i8 %A) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: ret i1 true
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;
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%B = sitofp i8 %A to double
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%C = fcmp ult double %B, 128.0
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ret i1 %C
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}
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define i1 @test2(i8 %A) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: ret i1 true
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;
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%B = sitofp i8 %A to double
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%C = fcmp ugt double %B, -128.1
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ret i1 %C
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}
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define i1 @test3(i8 %A) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: ret i1 true
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;
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%B = sitofp i8 %A to double
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%C = fcmp ule double %B, 127.0
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ret i1 %C
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}
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define i1 @test4(i8 %A) {
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; CHECK-LABEL: @test4(
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; CHECK-NEXT: [[C:%.*]] = icmp ne i8 [[A:%.*]], 127
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; CHECK-NEXT: ret i1 [[C]]
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;
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%B = sitofp i8 %A to double
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%C = fcmp ult double %B, 127.0
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ret i1 %C
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}
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define i32 @test5(i32 %A) {
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; CHECK-LABEL: @test5(
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; CHECK-NEXT: ret i32 [[A:%.*]]
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;
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%B = sitofp i32 %A to double
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%C = fptosi double %B to i32
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%D = uitofp i32 %C to double
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%E = fptoui double %D to i32
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ret i32 %E
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}
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define i32 @test6(i32 %A) {
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; CHECK-LABEL: @test6(
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; CHECK-NEXT: [[ADDCONV:%.*]] = and i32 [[A:%.*]], 39
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; CHECK-NEXT: ret i32 [[ADDCONV]]
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;
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%B = and i32 %A, 7
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%C = and i32 %A, 32
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%D = sitofp i32 %B to double
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%E = sitofp i32 %C to double
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%F = fadd double %D, %E
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%G = fptosi double %F to i32
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ret i32 %G
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}
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define i32 @test7(i32 %A) {
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; CHECK-LABEL: @test7(
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; CHECK-NEXT: ret i32 [[A:%.*]]
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;
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%B = sitofp i32 %A to double
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%C = fptoui double %B to i32
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ret i32 %C
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}
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define i32 @test8(i32 %A) {
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; CHECK-LABEL: @test8(
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; CHECK-NEXT: ret i32 [[A:%.*]]
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;
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%B = uitofp i32 %A to double
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%C = fptosi double %B to i32
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ret i32 %C
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}
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define i32 @test9(i8 %A) {
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; CHECK-LABEL: @test9(
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; CHECK-NEXT: [[C:%.*]] = zext i8 [[A:%.*]] to i32
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; CHECK-NEXT: ret i32 [[C]]
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;
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%B = sitofp i8 %A to float
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%C = fptoui float %B to i32
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ret i32 %C
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}
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define i32 @test10(i8 %A) {
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; CHECK-LABEL: @test10(
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; CHECK-NEXT: [[C:%.*]] = sext i8 [[A:%.*]] to i32
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; CHECK-NEXT: ret i32 [[C]]
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;
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%B = sitofp i8 %A to float
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%C = fptosi float %B to i32
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ret i32 %C
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}
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; If the input value is outside of the range of the output cast, it's
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; undefined behavior, so we can assume it fits.
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define i8 @test11(i32 %A) {
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; CHECK-LABEL: @test11(
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; CHECK-NEXT: [[C:%.*]] = trunc i32 [[A:%.*]] to i8
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; CHECK-NEXT: ret i8 [[C]]
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;
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%B = sitofp i32 %A to float
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%C = fptosi float %B to i8
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ret i8 %C
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}
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; If the input value is negative, it'll be outside the range of the
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; output cast, and thus undefined behavior.
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define i32 @test12(i8 %A) {
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; CHECK-LABEL: @test12(
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; CHECK-NEXT: [[C:%.*]] = zext i8 [[A:%.*]] to i32
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; CHECK-NEXT: ret i32 [[C]]
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;
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%B = sitofp i8 %A to float
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%C = fptoui float %B to i32
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ret i32 %C
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}
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; This can't fold because the 25-bit input doesn't fit in the mantissa.
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define i32 @test13(i25 %A) {
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; CHECK-LABEL: @test13(
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; CHECK-NEXT: [[B:%.*]] = uitofp i25 [[A:%.*]] to float
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; CHECK-NEXT: [[C:%.*]] = fptoui float [[B]] to i32
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; CHECK-NEXT: ret i32 [[C]]
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;
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%B = uitofp i25 %A to float
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%C = fptoui float %B to i32
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ret i32 %C
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}
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; But this one can.
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define i32 @test14(i24 %A) {
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; CHECK-LABEL: @test14(
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; CHECK-NEXT: [[C:%.*]] = zext i24 [[A:%.*]] to i32
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; CHECK-NEXT: ret i32 [[C]]
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;
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%B = uitofp i24 %A to float
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%C = fptoui float %B to i32
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ret i32 %C
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}
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; And this one can too.
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define i24 @test15(i32 %A) {
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; CHECK-LABEL: @test15(
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; CHECK-NEXT: [[C:%.*]] = trunc i32 [[A:%.*]] to i24
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; CHECK-NEXT: ret i24 [[C]]
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;
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%B = uitofp i32 %A to float
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%C = fptoui float %B to i24
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ret i24 %C
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}
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; This can fold because the 25-bit input is signed and we discard the sign bit.
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define i32 @test16(i25 %A) {
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; CHECK-LABEL: @test16(
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; CHECK-NEXT: [[C:%.*]] = zext i25 [[A:%.*]] to i32
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; CHECK-NEXT: ret i32 [[C]]
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;
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%B = sitofp i25 %A to float
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%C = fptoui float %B to i32
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ret i32 %C
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}
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; This can't fold because the 26-bit input won't fit the mantissa
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; even after discarding the signed bit.
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define i32 @test17(i26 %A) {
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; CHECK-LABEL: @test17(
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; CHECK-NEXT: [[B:%.*]] = sitofp i26 [[A:%.*]] to float
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; CHECK-NEXT: [[C:%.*]] = fptoui float [[B]] to i32
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; CHECK-NEXT: ret i32 [[C]]
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;
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%B = sitofp i26 %A to float
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%C = fptoui float %B to i32
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ret i32 %C
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}
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; This can't fold because the 54-bit output is big enough to hold an input
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; that was rounded when converted to double.
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define i54 @test18(i64 %A) {
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; CHECK-LABEL: @test18(
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; CHECK-NEXT: [[B:%.*]] = sitofp i64 [[A:%.*]] to double
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; CHECK-NEXT: [[C:%.*]] = fptosi double [[B]] to i54
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; CHECK-NEXT: ret i54 [[C]]
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;
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%B = sitofp i64 %A to double
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%C = fptosi double %B to i54
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ret i54 %C
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}
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; This can't fold because the 55-bit output won't fit the mantissa
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; even after discarding the sign bit.
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define i55 @test19(i64 %A) {
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; CHECK-LABEL: @test19(
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; CHECK-NEXT: [[B:%.*]] = sitofp i64 [[A:%.*]] to double
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; CHECK-NEXT: [[C:%.*]] = fptosi double [[B]] to i55
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; CHECK-NEXT: ret i55 [[C]]
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;
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%B = sitofp i64 %A to double
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%C = fptosi double %B to i55
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ret i55 %C
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}
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; The mask guarantees that the input is small enough to eliminate the FP casts.
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define i25 @masked_input(i25 %A) {
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; CHECK-LABEL: @masked_input(
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; CHECK-NEXT: [[M:%.*]] = and i25 [[A:%.*]], 65535
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; CHECK-NEXT: ret i25 [[M]]
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;
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%m = and i25 %A, 65535
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%B = uitofp i25 %m to float
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%C = fptoui float %B to i25
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ret i25 %C
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}
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define i25 @max_masked_input(i25 %A) {
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; CHECK-LABEL: @max_masked_input(
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; CHECK-NEXT: [[M:%.*]] = and i25 [[A:%.*]], 16777215
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; CHECK-NEXT: ret i25 [[M]]
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;
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%m = and i25 %A, 16777215 ; max intermediate 16777215 (= 1 << 24)-1
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%B = uitofp i25 %m to float
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%C = fptoui float %B to i25
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ret i25 %C
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}
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define i25 @consider_lowbits_masked_input(i25 %A) {
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; CHECK-LABEL: @consider_lowbits_masked_input(
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; CHECK-NEXT: [[M:%.*]] = and i25 [[A:%.*]], -16777214
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; CHECK-NEXT: ret i25 [[M]]
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;
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%m = and i25 %A, 16777218 ; Make use of the low zero bits - intermediate 16777218 (= 1 << 24 + 2)
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%B = uitofp i25 %m to float
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%C = fptoui float %B to i25
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ret i25 %C
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}
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define i32 @overflow_masked_input(i32 %A) {
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; CHECK-LABEL: @overflow_masked_input(
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; CHECK-NEXT: [[M:%.*]] = and i32 [[A:%.*]], 16777217
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; CHECK-NEXT: [[B:%.*]] = uitofp nneg i32 [[M]] to float
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; CHECK-NEXT: [[C:%.*]] = fptoui float [[B]] to i32
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; CHECK-NEXT: ret i32 [[C]]
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;
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%m = and i32 %A, 16777217 ; Negative test - intermediate 16777217 (= 1 << 24 + 1)
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%B = uitofp i32 %m to float
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%C = fptoui float %B to i32
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ret i32 %C
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}
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; Clear the low bit - guarantees that the input is converted to FP without rounding.
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define i25 @low_masked_input(i25 %A) {
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; CHECK-LABEL: @low_masked_input(
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; CHECK-NEXT: [[M:%.*]] = and i25 [[A:%.*]], -2
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; CHECK-NEXT: ret i25 [[M]]
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;
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%m = and i25 %A, -2
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%B = uitofp i25 %m to float
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%C = fptoui float %B to i25
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ret i25 %C
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}
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; Output is small enough to ensure exact cast (overflow produces poison).
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define i11 @s32_half_s11(i32 %x) {
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; CHECK-LABEL: @s32_half_s11(
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; CHECK-NEXT: [[R:%.*]] = trunc i32 [[X:%.*]] to i11
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; CHECK-NEXT: ret i11 [[R]]
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;
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%h = sitofp i32 %x to half
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%r = fptosi half %h to i11
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ret i11 %r
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}
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; Output is small enough to ensure exact cast (overflow produces poison).
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define i11 @s32_half_u11(i32 %x) {
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; CHECK-LABEL: @s32_half_u11(
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; CHECK-NEXT: [[R:%.*]] = trunc i32 [[X:%.*]] to i11
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; CHECK-NEXT: ret i11 [[R]]
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;
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%h = sitofp i32 %x to half
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%r = fptoui half %h to i11
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ret i11 %r
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}
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; Output is small enough to ensure exact cast (overflow produces poison).
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define i11 @u32_half_s11(i32 %x) {
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; CHECK-LABEL: @u32_half_s11(
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; CHECK-NEXT: [[R:%.*]] = trunc i32 [[X:%.*]] to i11
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; CHECK-NEXT: ret i11 [[R]]
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;
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%h = uitofp i32 %x to half
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%r = fptosi half %h to i11
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ret i11 %r
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}
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; Output is small enough to ensure exact cast (overflow produces poison).
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define i11 @u32_half_u11(i32 %x) {
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; CHECK-LABEL: @u32_half_u11(
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; CHECK-NEXT: [[R:%.*]] = trunc i32 [[X:%.*]] to i11
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; CHECK-NEXT: ret i11 [[R]]
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;
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%h = uitofp i32 %x to half
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%r = fptoui half %h to i11
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ret i11 %r
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}
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; Too many bits in output to ensure exact cast.
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define i12 @s32_half_s12(i32 %x) {
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; CHECK-LABEL: @s32_half_s12(
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; CHECK-NEXT: [[H:%.*]] = sitofp i32 [[X:%.*]] to half
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; CHECK-NEXT: [[R:%.*]] = fptosi half [[H]] to i12
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; CHECK-NEXT: ret i12 [[R]]
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;
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%h = sitofp i32 %x to half
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%r = fptosi half %h to i12
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ret i12 %r
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}
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; Too many bits in output to ensure exact cast.
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define i12 @s32_half_u12(i32 %x) {
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; CHECK-LABEL: @s32_half_u12(
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; CHECK-NEXT: [[H:%.*]] = sitofp i32 [[X:%.*]] to half
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; CHECK-NEXT: [[R:%.*]] = fptoui half [[H]] to i12
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; CHECK-NEXT: ret i12 [[R]]
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;
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%h = sitofp i32 %x to half
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%r = fptoui half %h to i12
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ret i12 %r
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}
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; TODO: This is safe to convert to trunc.
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define i12 @u32_half_s12(i32 %x) {
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; CHECK-LABEL: @u32_half_s12(
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; CHECK-NEXT: [[H:%.*]] = uitofp i32 [[X:%.*]] to half
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; CHECK-NEXT: [[R:%.*]] = fptosi half [[H]] to i12
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; CHECK-NEXT: ret i12 [[R]]
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;
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%h = uitofp i32 %x to half
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%r = fptosi half %h to i12
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ret i12 %r
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}
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; Too many bits in output to ensure exact cast.
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define i12 @u32_half_u12(i32 %x) {
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; CHECK-LABEL: @u32_half_u12(
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; CHECK-NEXT: [[H:%.*]] = uitofp i32 [[X:%.*]] to half
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; CHECK-NEXT: [[R:%.*]] = fptoui half [[H]] to i12
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; CHECK-NEXT: ret i12 [[R]]
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;
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%h = uitofp i32 %x to half
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%r = fptoui half %h to i12
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ret i12 %r
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}
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define <2 x i1> @i8_vec_sitofp_test1(<2 x i8> %A) {
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; CHECK-LABEL: @i8_vec_sitofp_test1(
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; CHECK-NEXT: ret <2 x i1> splat (i1 true)
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;
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%B = sitofp <2 x i8> %A to <2 x double>
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%C = fcmp ult <2 x double> %B, <double 128.0, double 128.0>
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ret <2 x i1> %C
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}
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define <2 x i1> @i8_vec_sitofp_test2(<2 x i8> %A) {
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; CHECK-LABEL: @i8_vec_sitofp_test2(
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; CHECK-NEXT: ret <2 x i1> splat (i1 true)
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;
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%B = sitofp <2 x i8> %A to <2 x double>
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%C = fcmp ugt <2 x double> %B, <double -128.1, double -128.1>
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ret <2 x i1> %C
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}
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define <2 x i1> @i8_vec_sitofp_test3(<2 x i8> %A) {
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; CHECK-LABEL: @i8_vec_sitofp_test3(
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; CHECK-NEXT: ret <2 x i1> splat (i1 true)
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;
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%B = sitofp <2 x i8> %A to <2 x double>
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%C = fcmp ule <2 x double> %B, <double 127.0, double 127.0>
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ret <2 x i1> %C
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}
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define <2 x i1> @i8_vec_sitofp_test4(<2 x i8> %A) {
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; CHECK-LABEL: @i8_vec_sitofp_test4(
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; CHECK-NEXT: [[C:%.*]] = icmp ne <2 x i8> [[A:%.*]], splat (i8 127)
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; CHECK-NEXT: ret <2 x i1> [[C]]
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;
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%B = sitofp <2 x i8> %A to <2 x double>
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%C = fcmp ult <2 x double> %B, <double 127.0, double 127.0>
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ret <2 x i1> %C
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}
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; Mask 98 = PosZero (64) | NegZero (32) | QNan (2)
|
|
define i1 @test_sitofp_nonzero(i32 %a) {
|
|
; CHECK-LABEL: @test_sitofp_nonzero(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: ret i1 false
|
|
;
|
|
entry:
|
|
%or = or i32 %a, 1
|
|
%f = sitofp i32 %or to float
|
|
%is.zero = call i1 @llvm.is.fpclass.f32(float %f, i32 98)
|
|
ret i1 %is.zero
|
|
}
|
|
|
|
; The i32 value 0xFF80 truncated to i16 is 0xFF80 = -128 (signed).
|
|
; Mask 960 = PosInf(512) | PosNormal(256) | PosSubnormal(128) | PosZero(64)
|
|
define i1 @test_sitofp_known_negative_trunc(i32 %a) {
|
|
; CHECK-LABEL: @test_sitofp_known_negative_trunc(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: ret i1 false
|
|
;
|
|
entry:
|
|
%or = or i32 %a, 65408
|
|
%trunc = trunc i32 %or to i16
|
|
%f = sitofp i16 %trunc to float
|
|
%is.pos = call i1 @llvm.is.fpclass.f32(float %f, i32 960)
|
|
ret i1 %is.pos
|
|
}
|
|
|
|
; The i32 value masked with 0x7FFF truncated to i16 clears the sign bit.
|
|
; Mask 60 = NegInf(4) | NegNormal(8) | NegSubnormal(16) | NegZero(32)
|
|
define i1 @test_sitofp_known_nonneg_trunc(i32 %a) {
|
|
; CHECK-LABEL: @test_sitofp_known_nonneg_trunc(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: ret i1 false
|
|
;
|
|
entry:
|
|
%and = and i32 %a, 32767
|
|
%trunc = trunc i32 %and to i16
|
|
%f = sitofp i16 %trunc to float
|
|
%is.neg = call i1 @llvm.is.fpclass.f32(float %f, i32 60)
|
|
ret i1 %is.neg
|
|
}
|
|
|
|
; Mask 516 = PosInf (512) | NegInf (4)
|
|
define i1 @test_uitofp_no_inf(i64 %a) {
|
|
; CHECK-LABEL: @test_uitofp_no_inf(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: ret i1 false
|
|
;
|
|
entry:
|
|
%and = and i64 %a, 32767
|
|
%f = uitofp i64 %and to half
|
|
; 516 checks for +Inf or -Inf
|
|
%is.inf = call i1 @llvm.is.fpclass.f16(half %f, i32 516)
|
|
ret i1 %is.inf
|
|
}
|
|
|
|
; Mask 516 = PosInf (512) | NegInf (4)
|
|
define i1 @test_sitofp_no_inf(i64 %a) {
|
|
; CHECK-LABEL: @test_sitofp_no_inf(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: ret i1 false
|
|
;
|
|
entry:
|
|
%and = and i64 %a, 32767
|
|
%f = sitofp i64 %and to half
|
|
; 516 checks for +Inf or -Inf
|
|
%is.inf = call i1 @llvm.is.fpclass.f16(half %f, i32 516)
|
|
ret i1 %is.inf
|
|
}
|