fecf609998
This reverts commit 1ec7e86b3a779df2a0af3f37e58c8f5b3a398d7f after issue #190072 was fixed.
35 lines
1.1 KiB
LLVM
35 lines
1.1 KiB
LLVM
;; This test comes from a real world scenario in LTO, where the definition of
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;; bcmp was deleted because it has no uses, but later instcombine re-introduced
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;; a call to bcmp() as part of SimplifyLibCalls. Such deletions must not be
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;; allowed.
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; RUN: opt %s -o %t.o -mtriple x86_64-unknown-linux-musl
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; RUN: llvm-lto2 run -o %t.lto.o \
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; RUN: -r %t.o,foo,plx \
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; RUN: -r %t.o,memcmp,x \
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; RUN: -r %t.o,bcmp,pl \
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; RUN: -r %t.o,bcmp_impl,x %t.o -save-temps
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; RUN: llvm-dis %t.lto.o.0.4.opt.bc -o - | FileCheck %s
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define i1 @foo(ptr %0, ptr %1, i64 %2) {
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; CHECK-LABEL: define{{.*}}i1 @foo
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; CHECK-NEXT: %bcmp = {{.*}}call i32 @bcmp
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; CHECK-NEXT: %eq = icmp eq i32 %bcmp, 0
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; CHECK-NEXT: ret i1 %eq
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%cmp = call i32 @memcmp(ptr %0, ptr %1, i64 %2)
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%eq = icmp eq i32 %cmp, 0
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ret i1 %eq
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}
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declare i32 @memcmp(ptr, ptr, i64)
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declare i32 @bcmp_impl(ptr, ptr, i64)
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;; Ensure bcmp is not removed from module because it is external.
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; CHECK: define dso_local i32 @bcmp
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define i32 @bcmp(ptr %0, ptr %1, i64 %2) noinline {
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%r = call i32 @bcmp_impl(ptr %0, ptr %1, i64 %2)
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ret i32 %r
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}
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