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79519fecc3
An identity COPY like this: %AL = COPY %AL, %EAX<imp-def> has no semantic effect, but encodes liveness information: Further users of %EAX only depend on this instruction even though it does not define the full register. Replace the COPY with a KILL instruction in those cases to maintain this liveness information. (This reverts a small part of r238588 but this time adds a comment explaining why a KILL instruction is useful). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274952 91177308-0d34-0410-b5e6-96231b3b80d8
70 lines
2.0 KiB
LLVM
70 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=x86_64-apple-darwin -mcpu=skx | FileCheck %s
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define i8 @mask8(i8 %x) {
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; CHECK-LABEL: mask8:
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; CHECK: ## BB#0:
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; CHECK-NEXT: kmovb %edi, %k0
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; CHECK-NEXT: knotb %k0, %k0
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; CHECK-NEXT: kmovb %k0, %eax
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; CHECK-NEXT: ## kill: %AL<def> %AL<kill> %EAX<kill>
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; CHECK-NEXT: retq
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%m0 = bitcast i8 %x to <8 x i1>
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%m1 = xor <8 x i1> %m0, <i1 -1, i1 -1, i1 -1, i1 -1, i1 -1, i1 -1, i1 -1, i1 -1>
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%ret = bitcast <8 x i1> %m1 to i8
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ret i8 %ret
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}
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define void @mask8_mem(i8* %ptr) {
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; CHECK-LABEL: mask8_mem:
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; CHECK: ## BB#0:
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; CHECK-NEXT: kmovb (%rdi), %k0
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; CHECK-NEXT: knotb %k0, %k0
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; CHECK-NEXT: kmovb %k0, (%rdi)
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; CHECK-NEXT: retq
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%x = load i8, i8* %ptr, align 4
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%m0 = bitcast i8 %x to <8 x i1>
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%m1 = xor <8 x i1> %m0, <i1 -1, i1 -1, i1 -1, i1 -1, i1 -1, i1 -1, i1 -1, i1 -1>
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%ret = bitcast <8 x i1> %m1 to i8
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store i8 %ret, i8* %ptr, align 4
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ret void
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}
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define i8 @mand8(i8 %x, i8 %y) {
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; CHECK-LABEL: mand8:
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; CHECK: ## BB#0:
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; CHECK-NEXT: movl %edi, %eax
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; CHECK-NEXT: xorl %esi, %eax
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; CHECK-NEXT: andl %esi, %edi
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; CHECK-NEXT: orl %eax, %edi
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; CHECK-NEXT: movl %edi, %eax
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; CHECK-NEXT: retq
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%ma = bitcast i8 %x to <8 x i1>
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%mb = bitcast i8 %y to <8 x i1>
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%mc = and <8 x i1> %ma, %mb
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%md = xor <8 x i1> %ma, %mb
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%me = or <8 x i1> %mc, %md
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%ret = bitcast <8 x i1> %me to i8
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ret i8 %ret
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}
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define i8 @mand8_mem(<8 x i1>* %x, <8 x i1>* %y) {
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; CHECK-LABEL: mand8_mem:
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; CHECK: ## BB#0:
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; CHECK-NEXT: kmovb (%rdi), %k0
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; CHECK-NEXT: kmovb (%rsi), %k1
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; CHECK-NEXT: kandb %k1, %k0, %k2
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; CHECK-NEXT: kxorb %k1, %k0, %k0
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; CHECK-NEXT: korb %k0, %k2, %k0
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; CHECK-NEXT: kmovb %k0, %eax
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; CHECK-NEXT: ## kill: %AL<def> %AL<kill> %EAX<kill>
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; CHECK-NEXT: retq
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%ma = load <8 x i1>, <8 x i1>* %x
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%mb = load <8 x i1>, <8 x i1>* %y
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%mc = and <8 x i1> %ma, %mb
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%md = xor <8 x i1> %ma, %mb
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%me = or <8 x i1> %mc, %md
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%ret = bitcast <8 x i1> %me to i8
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ret i8 %ret
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}
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