[llvm-commits] [llvm] r141924 - /llvm/trunk/lib/Target/X86/X86InstrSSE.td

[Jakob Stoklund Olesen]

Author: stoklund
Date: Thu Oct 13 19:39:50 2011
New Revision: 141924

URL: http://llvm.org/viewvc/llvm-project?rev=141924&view=rev
Log:
V_SET0 has no side effects.

TableGen will mark any pattern-less instruction as having unmodeled side
effects. This is extra bad for V_SET0 which gets rematerialized a lot.

This was part of the cause for PR11125, but the real bug was fixed
in r141923.

Modified:
    llvm/trunk/lib/Target/X86/X86InstrSSE.td

Modified: llvm/trunk/lib/Target/X86/X86InstrSSE.td
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86InstrSSE.td?rev=141924&r1=141923&r2=141924&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86InstrSSE.td (original)
+++ llvm/trunk/lib/Target/X86/X86InstrSSE.td Thu Oct 13 19:39:50 2011
@@ -266,7 +266,7 @@
 // We set canFoldAsLoad because this can be converted to a constant-pool
 // load of an all-zeros value if folding it would be beneficial.
 let isReMaterializable = 1, isAsCheapAsAMove = 1, canFoldAsLoad = 1,
-    isPseudo = 1 in {
+    isPseudo = 1, neverHasSideEffects = 1 in {
 def V_SET0 : I<0, Pseudo, (outs VR128:$dst), (ins), "", []>;
 }