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08762f9f1e
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). llvm-svn: 274952
22 lines
625 B
LLVM
22 lines
625 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: llc < %s -mtriple=i386-unknown-unknown | FileCheck %s
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define i8 @foo(i8 %tmp325) {
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; CHECK-LABEL: foo:
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; CHECK: # BB#0:
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; CHECK-NEXT: movzbl {{[0-9]+}}(%esp), %ecx
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; CHECK-NEXT: imull $111, %ecx, %eax
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; CHECK-NEXT: andl $28672, %eax # imm = 0x7000
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; CHECK-NEXT: shrl $12, %eax
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; CHECK-NEXT: movb $37, %dl
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; CHECK-NEXT: # kill: %AL<def> %AL<kill> %EAX<kill>
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; CHECK-NEXT: mulb %dl
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; CHECK-NEXT: subb %al, %cl
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; CHECK-NEXT: movl %ecx, %eax
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; CHECK-NEXT: retl
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;
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%t546 = urem i8 %tmp325, 37
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ret i8 %t546
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}
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