55ae279ba7
All extractvalues of the same value at the same index will map to the same register, so even if one specific extractvalue only has one use, we should not mark it as a trivial kill, as there may be more extractvalues later. Fixes https://bugs.llvm.org/show_bug.cgi?id=49467. Differential Revision: https://reviews.llvm.org/D98145
28 lines
885 B
LLVM
28 lines
885 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -O0 -fast-isel -verify-machineinstrs -mtriple=x86_64 < %s | FileCheck %s
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declare { i8*, i64 } @get()
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declare void @use(i8*, i64)
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define void @test(i64* %p) nounwind {
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; CHECK-LABEL: test:
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; CHECK: # %bb.0:
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; CHECK-NEXT: pushq %rax
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; CHECK-NEXT: movq %rdi, (%rsp) # 8-byte Spill
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; CHECK-NEXT: callq get@PLT
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; CHECK-NEXT: movq (%rsp), %rdi # 8-byte Reload
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; CHECK-NEXT: movq %rdx, %rsi
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; CHECK-NEXT: movq %rsi, (%rdi)
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; CHECK-NEXT: # implicit-def: $rdi
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; CHECK-NEXT: callq use@PLT
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; CHECK-NEXT: popq %rax
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; CHECK-NEXT: retq
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%struct = call { i8*, i64 } @get()
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%struct.1 = extractvalue { i8*, i64 } %struct, 1
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store i64 %struct.1, i64* %p, align 8
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%struct.2 = extractvalue { i8*, i64 } %struct, 1
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call void @use(i8* undef, i64 %struct.2)
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ret void
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}
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