35 lines
1.0 KiB
LLVM
35 lines
1.0 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 triple = "nvptx64"
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declare void @user(i8*)
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declare i8* @malloc(i64)
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declare void @free(i8*)
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; Ensure the nvptx backend states malloc & free are a thing so we can recognize
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; so we will optimize them properly. In the test below the malloc-free chain is
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; useless and we can remove it *if* we know about malloc & free.
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define void @malloc_then_free_not_needed() {
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; CHECK-LABEL: @malloc_then_free_not_needed(
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; CHECK-NEXT: ret void
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;
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%a = call i8* @malloc(i64 4)
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store i8 0, i8* %a
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call void @free(i8* %a)
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ret void
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}
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define void @malloc_then_free_needed() {
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; CHECK-LABEL: @malloc_then_free_needed(
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; CHECK-NEXT: [[A:%.*]] = call dereferenceable_or_null(4) i8* @malloc(i64 4)
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; CHECK-NEXT: call void @user(i8* [[A]])
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; CHECK-NEXT: call void @free(i8* [[A]])
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; CHECK-NEXT: ret void
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;
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%a = call i8* @malloc(i64 4)
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call void @user(i8* %a)
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call void @free(i8* %a)
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ret void
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}
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