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99aeb8e3a5
These intrinsics don't need to be marked as arbitrary writing, it's sufficient to write inaccessible memory (aka "side effect") to preserve control dependencies. This means less special-casing in BasicAA. This is intended as an alternative to D98925. Differential Revision: https://reviews.llvm.org/D99022
28 lines
1.0 KiB
LLVM
28 lines
1.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -instcombine %s -S -o - | FileCheck %s
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; This tests that llvm.annotation does not prevent load combining.
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-grtev4-linux-gnu"
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declare i32 @llvm.annotation.i32(i32, i8*, i8*, i32) #1
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define dso_local i32 @annotated(i32* %c) local_unnamed_addr #0 {
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; CHECK-LABEL: @annotated(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP0:%.*]] = load i32, i32* [[C:%.*]], align 4
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; CHECK-NEXT: [[TMP1:%.*]] = call i32 @llvm.annotation.i32(i32 [[TMP0]], i8* undef, i8* undef, i32 undef)
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; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[TMP1]], [[TMP0]]
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; CHECK-NEXT: ret i32 [[ADD]]
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;
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entry:
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%0 = load i32, i32* %c, align 4
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%1 = call i32 @llvm.annotation.i32(i32 %0, i8* undef, i8* undef, i32 undef)
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%2 = load i32, i32* %c, align 4
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%add = add nsw i32 %1, %2
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ret i32 %add
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}
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attributes #0 = { nofree nounwind uwtable willreturn mustprogress }
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