e838471bc4
This is the case which triggered the revert of 660b740. Note that the test is extremely fragile as it depends on getting a truncating store at the right moment rather than folding the constant to a narrower bitwidth. This appears to happen on skylake, but not e.g. plain avx.
22 lines
793 B
LLVM
22 lines
793 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
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; RUN: llc -mtriple=x86_64-unknown-unknown -mcpu=skx < %s | FileCheck %s
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; If we have a truncating store, we need to truncate the elements when
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; when combining the constants.
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define void @pr64593(ptr %p) {
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; CHECK-LABEL: pr64593:
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; CHECK: # %bb.0:
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; CHECK-NEXT: vpxor %xmm0, %xmm0, %xmm0
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; CHECK-NEXT: vpmovqb %zmm0, (%rdi)
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; CHECK-NEXT: movq $0, 8(%rdi)
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; CHECK-NEXT: vzeroupper
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; CHECK-NEXT: retq
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%v = insertelement <8 x i64> zeroinitializer, i64 0, i32 1
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%trunc = trunc <8 x i64> %v to <8 x i8>
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%p1 = getelementptr i8, ptr %p, i32 0
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%p2 = getelementptr i8, ptr %p, i32 8
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store <8 x i8> %trunc, ptr %p1
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store <8 x i8> zeroinitializer, ptr %p2
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ret void
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}
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