6568ceb9fa
Alive2: https://alive2.llvm.org/ce/z/pMcD7q Closes https://github.com/llvm/llvm-project/issues/118172.
87 lines
2.9 KiB
LLVM
87 lines
2.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -S -passes='require<profile-summary>,function(codegenprepare)' -mtriple=x86_64-unknown-unknown < %s | FileCheck %s
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; Make sure the nsw flag is dropped when the load ext is combined.
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define i32 @simplify_load_ext_drop_trunc_nsw(ptr %p) {
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; CHECK-LABEL: define i32 @simplify_load_ext_drop_trunc_nsw(
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; CHECK-SAME: ptr [[P:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[X:%.*]] = load i32, ptr [[P]], align 4
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; CHECK-NEXT: [[TMP0:%.*]] = and i32 [[X]], 255
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; CHECK-NEXT: [[TRUNC:%.*]] = trunc i32 [[TMP0]] to i8
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; CHECK-NEXT: [[EXT1:%.*]] = sext i8 [[TRUNC]] to i16
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; CHECK-NEXT: call void @use(i32 [[TMP0]])
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; CHECK-NEXT: [[EXT2:%.*]] = zext i16 [[EXT1]] to i32
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; CHECK-NEXT: ret i32 [[EXT2]]
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;
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entry:
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%x = load i32, ptr %p, align 4
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%trunc = trunc nsw i32 %x to i8
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%ext1 = sext i8 %trunc to i16
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%conv2 = and i32 %x, 255
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call void @use(i32 %conv2)
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%ext2 = zext i16 %ext1 to i32
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ret i32 %ext2
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}
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; Make sure the nsw flag is dropped when the load ext is combined.
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define i32 @simplify_load_ext_drop_shl_nsw(ptr %p) {
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; CHECK-LABEL: define i32 @simplify_load_ext_drop_shl_nsw(
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; CHECK-SAME: ptr [[P:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[X:%.*]] = load i32, ptr [[P]], align 4
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; CHECK-NEXT: [[TMP0:%.*]] = and i32 [[X]], 255
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; CHECK-NEXT: [[SHL:%.*]] = shl i32 [[TMP0]], 24
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; CHECK-NEXT: call void @use(i32 [[TMP0]])
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; CHECK-NEXT: ret i32 [[SHL]]
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;
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entry:
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%x = load i32, ptr %p, align 4
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%shl = shl nsw i32 %x, 24
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%conv2 = and i32 %x, 255
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call void @use(i32 %conv2)
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ret i32 %shl
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}
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define i32 @simplify_load_ext_keep_trunc_nuw(ptr %p) {
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; CHECK-LABEL: define i32 @simplify_load_ext_keep_trunc_nuw(
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; CHECK-SAME: ptr [[P:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[X:%.*]] = load i32, ptr [[P]], align 4
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; CHECK-NEXT: [[TMP0:%.*]] = and i32 [[X]], 255
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; CHECK-NEXT: [[TRUNC:%.*]] = trunc nuw i32 [[TMP0]] to i8
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; CHECK-NEXT: [[EXT1:%.*]] = sext i8 [[TRUNC]] to i16
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; CHECK-NEXT: call void @use(i32 [[TMP0]])
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; CHECK-NEXT: [[EXT2:%.*]] = zext i16 [[EXT1]] to i32
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; CHECK-NEXT: ret i32 [[EXT2]]
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;
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entry:
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%x = load i32, ptr %p, align 4
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%trunc = trunc nuw i32 %x to i8
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%ext1 = sext i8 %trunc to i16
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%conv2 = and i32 %x, 255
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call void @use(i32 %conv2)
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%ext2 = zext i16 %ext1 to i32
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ret i32 %ext2
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}
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define i32 @simplify_load_ext_drop_shl_nuw(ptr %p) {
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; CHECK-LABEL: define i32 @simplify_load_ext_drop_shl_nuw(
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; CHECK-SAME: ptr [[P:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*:]]
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; CHECK-NEXT: [[X:%.*]] = load i32, ptr [[P]], align 4
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; CHECK-NEXT: [[TMP0:%.*]] = and i32 [[X]], 255
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; CHECK-NEXT: [[SHL:%.*]] = shl nuw i32 [[TMP0]], 24
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; CHECK-NEXT: call void @use(i32 [[TMP0]])
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; CHECK-NEXT: ret i32 [[SHL]]
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;
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entry:
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%x = load i32, ptr %p, align 4
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%shl = shl nuw i32 %x, 24
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%conv2 = and i32 %x, 255
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call void @use(i32 %conv2)
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ret i32 %shl
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}
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declare void @use(i32)
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