diff options
| -rw-r--r-- | lib/Target/X86/README.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Target/X86/README.txt b/lib/Target/X86/README.txt index 09d9bb6ef8..060552b93d 100644 --- a/lib/Target/X86/README.txt +++ b/lib/Target/X86/README.txt @@ -667,3 +667,9 @@ directly %esp[0] if there are no other uses. Use movhps to update upper 64-bits of a v4sf value. Also movlps on lower half of a v4sf value. + +//===---------------------------------------------------------------------===// + +Better codegen for vector_shuffles like this { x, 0, 0, 0 } or { x, 0, x, 0}. +Perhaps use pxor / xorp* to clear a XMM register first? + |