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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27790 91177308-0d34-0410-b5e6-96231b3b80d8
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Evan Cheng 2006-04-18 03:45:01 +00:00
parent 72dd9bdcc5
commit 4980467476
1 changed files with 6 additions and 6 deletions
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12
lib/Target/X86/README.txt
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@ -982,17 +982,17 @@ LBB_main_4: # cond_true44
jne LBB_main_4 # cond_true44 jne LBB_main_4 # cond_true44
There are two problems. 1) No need to two loop induction variables. We can There are two problems. 1) No need to two loop induction variables. We can
compare against 262144 * 16. 2) Poor register allocation decisions. We should compare against 262144 * 16. 2) Known register coalescer issue. We should
be able eliminate one of the movaps: be able eliminate one of the movaps:
addps %xmm1, %xmm2 addps %xmm2, %xmm1 <=== Commute!
subps %xmm3, %xmm2 subps %xmm3, %xmm1
movaps (%ecx), %xmm4 movaps (%ecx), %xmm4
movaps %xmm2, %xmm2 <=== Eliminate! movaps %xmm1, %xmm1 <=== Eliminate!
addps %xmm4, %xmm2 addps %xmm4, %xmm1
addl $16, %ecx addl $16, %ecx
incl %edx incl %edx
cmpl $262144, %edx cmpl $262144, %edx
movaps %xmm3, %xmm1 movaps %xmm3, %xmm2
movaps %xmm4, %xmm3 movaps %xmm4, %xmm3
jne LBB_main_4 # cond_true44 jne LBB_main_4 # cond_true44