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Stabilize the order of live intervals in the priority_queue used by the

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linear scan reg alloc.  This fixes a problem I ran into where extracting
a function from a larger file caused the generated code to change (masking
the problem I was trying to debug) because the allocator behaved differently.

This changes the results for two X86 regression checks.  stack-color-with-reg
is improved, with one less instruction, but pr3495 is worse, with one more
copy.  As far as I can tell, these tests were just getting lucky or unlucky,
so I've changed the expected results.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81060 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2009-09-05 01:19:16 +00:00
parent bd1d6a8ce1
commit da4ae4be5b
3 changed files with 8 additions and 5 deletions
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2
test/CodeGen/X86/stack-color-with-reg.ll
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@@ -1,7 +1,7 @@
; RUN: llvm-as < %s | llc -mtriple=x86_64-apple-darwin10 -relocation-model=pic -disable-fp-elim -color-ss-with-regs -stats -info-output-file - > %t
; RUN: grep stackcoloring %t | grep "loads eliminated"
; RUN: grep stackcoloring %t | grep "stack slot refs replaced with reg refs" | grep 5
; RUN: grep asm-printer %t | grep 182
; RUN: grep asm-printer %t | grep 181
type { [62 x %struct.Bitvec*] } ; type %0
type { i8* } ; type %1