Remove obsolete README_SSE note.

We are generating movaps for all XMM register copies, including scalar
floating point values. This is known to be at least as good as movss and movsd
for all known architectures up to and including Nehalem because it avoids a
partial register stall.

The SSEDomainFix pass will switch movaps to movdqa when appropriate (i.e., when
operands come from the integer unit). We don't now that switching movaps to
movapd has any benefit.

The same applies to andps -> pand.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108096 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/README-SSE.txt b/lib/Target/X86/README-SSE.txt
index 2a8506f..b6aba93 100644 (file)
--- a/lib/Target/X86/README-SSE.txt
+++ b/lib/Target/X86/README-SSE.txt
@@ -89,16 +89,6 @@ Perhaps use pxor / xorp* to clear a XMM register first?
 
 //===---------------------------------------------------------------------===//
 
-X86RegisterInfo::copyRegToReg() returns X86::MOVAPSrr for VR128. Is it possible
-to choose between movaps, movapd, and movdqa based on types of source and
-destination?
-
-How about andps, andpd, and pand? Do we really care about the type of the packed
-elements? If not, why not always use the "ps" variants which are likely to be
-shorter.
-
-//===---------------------------------------------------------------------===//
-
 External test Nurbs exposed some problems. Look for
 __ZN15Nurbs_SSE_Cubic17TessellateSurfaceE, bb cond_next140. This is what icc
 emits: