diff options
| -rw-r--r-- | lib/Target/X86/README.txt | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index 39a4407f8b..67bc04ff71 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -982,17 +982,17 @@ 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 -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: - addps %xmm1, %xmm2 - subps %xmm3, %xmm2 + addps %xmm2, %xmm1 <=== Commute! + subps %xmm3, %xmm1 movaps (%ecx), %xmm4 - movaps %xmm2, %xmm2 <=== Eliminate! - addps %xmm4, %xmm2 + movaps %xmm1, %xmm1 <=== Eliminate! + addps %xmm4, %xmm1 addl $16, %ecx incl %edx cmpl $262144, %edx - movaps %xmm3, %xmm1 + movaps %xmm3, %xmm2 movaps %xmm4, %xmm3 jne LBB_main_4 # cond_true44 |