[llvm] r321956 - [X86] Correct the load folding flags for xmm fp->mmx conversion instructions.

[Craig Topper via llvm-commits]

Author: ctopper
Date: Sat Jan  6 22:24:30 2018
New Revision: 321956

URL: http://llvm.org/viewvc/llvm-project?rev=321956&view=rev
Log:
[X86] Correct the load folding flags for xmm fp->mmx conversion instructions.

The instructions that load 64-bits or an xmm register should be TB_NO_REVERSE to avoid the load being widened during unfold. The instructions that load 128-bits need to ensure 128-bit alignment.

Modified:
    llvm/trunk/lib/Target/X86/X86InstrInfo.cpp

Modified: llvm/trunk/lib/Target/X86/X86InstrInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86InstrInfo.cpp?rev=321956&r1=321955&r2=321956&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86InstrInfo.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86InstrInfo.cpp Sat Jan  6 22:24:30 2018
@@ -672,11 +672,11 @@ X86InstrInfo::X86InstrInfo(X86Subtarget
     { X86::UCOMISSrr,       X86::UCOMISSrm,           0 },
 
     // MMX version of foldable instructions
-    { X86::MMX_CVTPD2PIirr,   X86::MMX_CVTPD2PIirm,   0 },
+    { X86::MMX_CVTPD2PIirr,   X86::MMX_CVTPD2PIirm,   TB_ALIGN_16 },
     { X86::MMX_CVTPI2PDirr,   X86::MMX_CVTPI2PDirm,   0 },
-    { X86::MMX_CVTPS2PIirr,   X86::MMX_CVTPS2PIirm,   0 },
-    { X86::MMX_CVTTPD2PIirr,  X86::MMX_CVTTPD2PIirm,  0 },
-    { X86::MMX_CVTTPS2PIirr,  X86::MMX_CVTTPS2PIirm,  0 },
+    { X86::MMX_CVTPS2PIirr,   X86::MMX_CVTPS2PIirm,   TB_NO_REVERSE },
+    { X86::MMX_CVTTPD2PIirr,  X86::MMX_CVTTPD2PIirm,  TB_ALIGN_16 },
+    { X86::MMX_CVTTPS2PIirr,  X86::MMX_CVTTPS2PIirm,  TB_NO_REVERSE },
     { X86::MMX_MOVD64to64rr,  X86::MMX_MOVQ64rm,      0 },
     { X86::MMX_PABSBrr64,     X86::MMX_PABSBrm64,     0 },
     { X86::MMX_PABSDrr64,     X86::MMX_PABSDrm64,     0 },