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PHI elimination should not break back edge. It can cause some significant code placement issues. rdar://8263994

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good:
LBB0_2:
  mov     r2, r0
  . . .
  mov     r1, r2
  bne     LBB0_2

bad:
LBB0_2:
  mov     r2, r0
  . . .
@ BB#3:
  mov     r1, r2
  b       LBB0_2


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111221 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2010-08-17 01:20:36 +00:00
parent 922157c834
commit 97b9b97853
4 changed files with 45 additions and 7 deletions
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4
test/CodeGen/X86/lsr-reuse.ll
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@@ -464,7 +464,7 @@ bb5: ; preds = %bb3, %entry
; And the one at %bb68, where we want to be sure to use superhero mode:
; CHECK: BB10_10:
; CHECK: BB10_9:
; CHECK-NEXT: movaps 48(%r{{[^,]*}}), %xmm{{.*}}
; CHECK-NEXT: mulps %xmm{{.*}}, %xmm{{.*}}
; CHECK-NEXT: movaps 32(%r{{[^,]*}}), %xmm{{.*}}
@@ -484,7 +484,7 @@ bb5: ; preds = %bb3, %entry
; CHECK-NEXT: addq $64, %r{{.*}}
; CHECK-NEXT: addq $64, %r{{.*}}
; CHECK-NEXT: addq $-16, %r{{.*}}
; CHECK-NEXT: BB10_11:
; CHECK-NEXT: BB10_10:
; CHECK-NEXT: cmpq $15, %r{{.*}}
; CHECK-NEXT: jg