derek.holloway
7502bf64a4
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197 lines
6.4 KiB
LLVM
197 lines
6.4 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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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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; Perform the shift first and merge the truncs as long as all zero/sign
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; bits created by the shift are removed by the trunc.
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declare void @use(i32)
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define i8 @trunc_lshr_trunc(i64 %a) {
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; CHECK-LABEL: @trunc_lshr_trunc(
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; CHECK-NEXT: [[C1:%.*]] = lshr i64 [[A:%.*]], 8
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; CHECK-NEXT: [[D:%.*]] = trunc i64 [[C1]] to i8
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; CHECK-NEXT: ret i8 [[D]]
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;
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%b = trunc i64 %a to i32
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%c = lshr i32 %b, 8
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%d = trunc i32 %c to i8
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ret i8 %d
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}
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define <2 x i8> @trunc_shl_trunc(<2 x i64> %a) {
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; CHECK-LABEL: @trunc_shl_trunc(
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; CHECK-NEXT: [[B:%.*]] = trunc <2 x i64> [[A:%.*]] to <2 x i32>
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; CHECK-NEXT: [[C:%.*]] = shl <2 x i32> [[B]], <i32 9, i32 7>
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; CHECK-NEXT: [[D:%.*]] = trunc <2 x i32> [[C]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[D]]
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;
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%b = trunc <2 x i64> %a to <2 x i32>
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%c = shl <2 x i32> %b, <i32 9, i32 7>
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%d = trunc <2 x i32> %c to <2 x i8>
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ret <2 x i8> %d
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}
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define <2 x i8> @trunc_lshr_trunc_uniform(<2 x i64> %a) {
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; CHECK-LABEL: @trunc_lshr_trunc_uniform(
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; CHECK-NEXT: [[C1:%.*]] = lshr <2 x i64> [[A:%.*]], splat (i64 8)
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; CHECK-NEXT: [[D:%.*]] = trunc <2 x i64> [[C1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[D]]
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;
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%b = trunc <2 x i64> %a to <2 x i32>
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%c = lshr <2 x i32> %b, <i32 8, i32 8>
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%d = trunc <2 x i32> %c to <2 x i8>
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ret <2 x i8> %d
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}
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define <2 x i8> @trunc_lshr_trunc_nonuniform(<2 x i64> %a) {
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; CHECK-LABEL: @trunc_lshr_trunc_nonuniform(
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; CHECK-NEXT: [[C1:%.*]] = lshr <2 x i64> [[A:%.*]], <i64 8, i64 2>
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; CHECK-NEXT: [[D:%.*]] = trunc <2 x i64> [[C1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[D]]
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;
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%b = trunc <2 x i64> %a to <2 x i32>
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%c = lshr <2 x i32> %b, <i32 8, i32 2>
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%d = trunc <2 x i32> %c to <2 x i8>
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ret <2 x i8> %d
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}
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define <2 x i8> @trunc_lshr_trunc_uniform_poison(<2 x i64> %a) {
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; CHECK-LABEL: @trunc_lshr_trunc_uniform_poison(
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; CHECK-NEXT: [[C1:%.*]] = lshr <2 x i64> [[A:%.*]], <i64 24, i64 poison>
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; CHECK-NEXT: [[D:%.*]] = trunc <2 x i64> [[C1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[D]]
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;
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%b = trunc <2 x i64> %a to <2 x i32>
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%c = lshr <2 x i32> %b, <i32 24, i32 poison>
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%d = trunc <2 x i32> %c to <2 x i8>
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ret <2 x i8> %d
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}
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define i8 @trunc_lshr_trunc_outofrange(i64 %a) {
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; CHECK-LABEL: @trunc_lshr_trunc_outofrange(
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; CHECK-NEXT: [[B:%.*]] = trunc i64 [[A:%.*]] to i32
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; CHECK-NEXT: [[C:%.*]] = lshr i32 [[B]], 25
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; CHECK-NEXT: [[D:%.*]] = trunc nuw nsw i32 [[C]] to i8
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; CHECK-NEXT: ret i8 [[D]]
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;
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%b = trunc i64 %a to i32
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%c = lshr i32 %b, 25
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%d = trunc i32 %c to i8
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ret i8 %d
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}
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define <2 x i8> @trunc_lshr_trunc_nonuniform_outofrange(<2 x i64> %a) {
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; CHECK-LABEL: @trunc_lshr_trunc_nonuniform_outofrange(
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; CHECK-NEXT: [[B:%.*]] = trunc <2 x i64> [[A:%.*]] to <2 x i32>
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; CHECK-NEXT: [[C:%.*]] = lshr <2 x i32> [[B]], <i32 8, i32 25>
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; CHECK-NEXT: [[D:%.*]] = trunc <2 x i32> [[C]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[D]]
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;
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%b = trunc <2 x i64> %a to <2 x i32>
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%c = lshr <2 x i32> %b, <i32 8, i32 25>
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%d = trunc <2 x i32> %c to <2 x i8>
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ret <2 x i8> %d
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}
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define i8 @trunc_ashr_trunc(i64 %a) {
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; CHECK-LABEL: @trunc_ashr_trunc(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr i64 [[A:%.*]], 8
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; CHECK-NEXT: [[D:%.*]] = trunc i64 [[TMP1]] to i8
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; CHECK-NEXT: ret i8 [[D]]
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;
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%b = trunc i64 %a to i32
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%c = ashr i32 %b, 8
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%d = trunc i32 %c to i8
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ret i8 %d
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}
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define i8 @trunc_ashr_trunc_exact(i64 %a) {
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; CHECK-LABEL: @trunc_ashr_trunc_exact(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr exact i64 [[A:%.*]], 8
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; CHECK-NEXT: [[D:%.*]] = trunc i64 [[TMP1]] to i8
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; CHECK-NEXT: ret i8 [[D]]
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;
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%b = trunc i64 %a to i32
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%c = ashr exact i32 %b, 8
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%d = trunc i32 %c to i8
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ret i8 %d
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}
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define <2 x i8> @trunc_ashr_trunc_uniform(<2 x i64> %a) {
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; CHECK-LABEL: @trunc_ashr_trunc_uniform(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr <2 x i64> [[A:%.*]], splat (i64 8)
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; CHECK-NEXT: [[D:%.*]] = trunc <2 x i64> [[TMP1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[D]]
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;
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%b = trunc <2 x i64> %a to <2 x i32>
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%c = ashr <2 x i32> %b, <i32 8, i32 8>
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%d = trunc <2 x i32> %c to <2 x i8>
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ret <2 x i8> %d
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}
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define <2 x i8> @trunc_ashr_trunc_nonuniform(<2 x i64> %a) {
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; CHECK-LABEL: @trunc_ashr_trunc_nonuniform(
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; CHECK-NEXT: [[C1:%.*]] = ashr <2 x i64> [[A:%.*]], <i64 0, i64 23>
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; CHECK-NEXT: [[D:%.*]] = trunc <2 x i64> [[C1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[D]]
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;
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%b = trunc <2 x i64> %a to <2 x i32>
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%c = ashr <2 x i32> %b, <i32 0, i32 23>
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%d = trunc <2 x i32> %c to <2 x i8>
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ret <2 x i8> %d
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}
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define <2 x i8> @trunc_ashr_trunc_uniform_poison(<2 x i64> %a) {
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; CHECK-LABEL: @trunc_ashr_trunc_uniform_poison(
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; CHECK-NEXT: [[C1:%.*]] = ashr <2 x i64> [[A:%.*]], <i64 8, i64 poison>
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; CHECK-NEXT: [[D:%.*]] = trunc <2 x i64> [[C1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[D]]
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;
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%b = trunc <2 x i64> %a to <2 x i32>
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%c = ashr <2 x i32> %b, <i32 8, i32 poison>
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%d = trunc <2 x i32> %c to <2 x i8>
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ret <2 x i8> %d
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}
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define i8 @trunc_ashr_trunc_outofrange(i64 %a) {
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; CHECK-LABEL: @trunc_ashr_trunc_outofrange(
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; CHECK-NEXT: [[B:%.*]] = trunc i64 [[A:%.*]] to i32
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; CHECK-NEXT: [[C:%.*]] = ashr i32 [[B]], 25
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; CHECK-NEXT: [[D:%.*]] = trunc nsw i32 [[C]] to i8
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; CHECK-NEXT: ret i8 [[D]]
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;
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%b = trunc i64 %a to i32
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%c = ashr i32 %b, 25
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%d = trunc i32 %c to i8
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ret i8 %d
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}
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define <2 x i8> @trunc_ashr_trunc_nonuniform_outofrange(<2 x i64> %a) {
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; CHECK-LABEL: @trunc_ashr_trunc_nonuniform_outofrange(
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; CHECK-NEXT: [[B:%.*]] = trunc <2 x i64> [[A:%.*]] to <2 x i32>
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; CHECK-NEXT: [[C:%.*]] = ashr <2 x i32> [[B]], <i32 8, i32 25>
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; CHECK-NEXT: [[D:%.*]] = trunc <2 x i32> [[C]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[D]]
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;
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%b = trunc <2 x i64> %a to <2 x i32>
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%c = ashr <2 x i32> %b, <i32 8, i32 25>
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%d = trunc <2 x i32> %c to <2 x i8>
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ret <2 x i8> %d
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}
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define i8 @trunc_ashr_trunc_multiuse(i64 %a) {
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; CHECK-LABEL: @trunc_ashr_trunc_multiuse(
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; CHECK-NEXT: [[B:%.*]] = trunc i64 [[A:%.*]] to i32
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; CHECK-NEXT: [[C:%.*]] = ashr i32 [[B]], 9
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; CHECK-NEXT: [[D:%.*]] = trunc i32 [[C]] to i8
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; CHECK-NEXT: call void @use(i32 [[C]])
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; CHECK-NEXT: ret i8 [[D]]
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;
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%b = trunc i64 %a to i32
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%c = ashr i32 %b, 9
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%d = trunc i32 %c to i8
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call void @use(i32 %c)
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ret i8 %d
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}
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