[PATCH 7/9] R600/SI: swap operands if it helps folding
Christian König
deathsimple at vodafone.de
Mon Feb 25 06:49:02 PST 2013
From: Christian König <christian.koenig at amd.com>
Signed-off-by: Christian König <christian.koenig at amd.com>
---
lib/Target/R600/SIISelLowering.cpp | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/lib/Target/R600/SIISelLowering.cpp b/lib/Target/R600/SIISelLowering.cpp
index bf1f3bf..da30c07 100644
--- a/lib/Target/R600/SIISelLowering.cpp
+++ b/lib/Target/R600/SIISelLowering.cpp
@@ -545,8 +545,22 @@ SDNode *SITargetLowering::PostISelFolding(MachineSDNode *Node,
// Is this a VSrc or SSrc operand ?
unsigned RegClass = Desc->OpInfo[Op].RegClass;
- if (!isVSrc(RegClass) && !isSSrc(RegClass))
+ if (!isVSrc(RegClass) && !isSSrc(RegClass)) {
+
+ if (i == 1 && Desc->isCommutable() &&
+ fitsRegClass(DAG, Ops[0], RegClass) &&
+ foldImm(Ops[1], Immediate, ScalarSlotUsed)) {
+
+ assert(isVSrc(Desc->OpInfo[NumDefs].RegClass) ||
+ isSSrc(Desc->OpInfo[NumDefs].RegClass));
+
+ // Swap commutable operands
+ SDValue Tmp = Ops[1];
+ Ops[1] = Ops[0];
+ Ops[0] = Tmp;
+ }
continue;
+ }
// Try to fold the immediates
if (!foldImm(Ops[i], Immediate, ScalarSlotUsed)) {
--
1.7.10.4
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