derek.holloway
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59 lines
1.5 KiB
LLVM
59 lines
1.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -S -passes=instcombine | FileCheck %s
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declare i8 @llvm.bitreverse.i8(i8)
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declare i32 @llvm.bitreverse.i32(i32)
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define i1 @test1(i32 %arg) {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: ret i1 true
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;
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%a = or i32 %arg, 4294901760
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%b = call i32 @llvm.bitreverse.i32(i32 %a)
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%and = and i32 %b, 65535
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%res = icmp eq i32 %and, 65535
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ret i1 %res
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}
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define i1 @test2(i32 %arg) {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: ret i1 true
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;
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%a = or i32 %arg, 1
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%b = call i32 @llvm.bitreverse.i32(i32 %a)
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%c = and i32 %b, 2147483648
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%d = call i32 @llvm.bitreverse.i32(i32 %c)
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%res = icmp eq i32 %d, 1
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ret i1 %res
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}
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define i1 @test3(i32 %arg) {
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; CHECK-LABEL: @test3(
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; CHECK-NEXT: ret i1 false
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;
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%a = or i32 %arg, 65536
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%b = call i32 @llvm.bitreverse.i32(i32 %a)
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%and = and i32 %b, 32768
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%res = icmp eq i32 %and, 0
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ret i1 %res
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}
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; known bits for the bitreverse will say the result is in the range [0, 64)
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; but the metadata says [0, 16). So make sure the range metadata wins.
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; add %reverse, 1111 0000
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; should become
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; or %reverse, 1111 0000
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define i8 @add_bitreverse(i8 %a) {
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; CHECK-LABEL: @add_bitreverse(
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; CHECK-NEXT: [[TMP1:%.*]] = or i8 [[A:%.*]], 15
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; CHECK-NEXT: [[C:%.*]] = call i8 @llvm.bitreverse.i8(i8 [[TMP1]])
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; CHECK-NEXT: ret i8 [[C]]
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;
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%b = and i8 %a, 252
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%reverse = call i8 @llvm.bitreverse.i8(i8 %b), !range !1
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%c = add i8 %reverse, -16
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ret i8 %c
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}
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!1 = !{i8 0, i8 16}
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