diff options
| -rw-r--r-- | lib/Target/X86/README-SSE.txt | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/lib/Target/X86/README-SSE.txt b/lib/Target/X86/README-SSE.txt index 9d642910b7..20e5a91dc5 100644 --- a/lib/Target/X86/README-SSE.txt +++ b/lib/Target/X86/README-SSE.txt @@ -671,3 +671,27 @@ beneficial because it prevents the load from being folded into the multiply. //===---------------------------------------------------------------------===// +In this loop: + +LBB4_6: # bb47.preheader + shlw $2, %si + decw %si + movzwl %si, %eax + incl %eax + xorl %ecx, %ecx +LBB4_7: # bb47 + xorps %xmm0, %xmm0 # (1) + movaps %xmm0, (%edx) + movaps %xmm0, 16(%edx) + addl $32, %edx + incl %ecx + cmpl %eax, %ecx + jne LBB4_7 # bb47 +LBB4_8: # bb42.return_crit_edge + xorw %si, %si + jmp LBB4_12 # return + +The instruction at (1) can be moved out of the main body of the loop. + +//===---------------------------------------------------------------------===// + |