21 lines
860 B
LLVM
21 lines
860 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
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; RUN: opt -S -passes=newgvn < %s | FileCheck %s
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; Check that loads from calloc are recognized as being zero.
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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-S128"
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; Function Attrs: nounwind uwtable
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define i32 @test1() {
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; CHECK-LABEL: define i32 @test1() {
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; CHECK-NEXT: [[TMP1:%.*]] = tail call noalias ptr @calloc(i64 1, i64 4)
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; CHECK-NEXT: ret i32 0
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;
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%1 = tail call noalias ptr @calloc(i64 1, i64 4)
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; This load is trivially constant zero
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%2 = load i32, ptr %1, align 4
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ret i32 %2
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}
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declare noalias ptr @calloc(i64, i64) mustprogress nofree nounwind willreturn allockind("alloc,zeroed") allocsize(0,1) "alloc-family"="malloc"
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