[llvm-commits] [llvm] r112329 - /llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
Bob Wilson
bob.wilson at apple.com
Fri Aug 27 16:57:52 PDT 2010
Author: bwilson
Date: Fri Aug 27 18:57:52 2010
New Revision: 112329
URL: http://llvm.org/viewvc/llvm-project?rev=112329&view=rev
Log:
When merging Thumb2 loads/stores, do not give up when the offset is one of
the special values that for ARM would be used with IB or DA modes. Fall
through and consider materializing a new base address is it would be
profitable.
Modified:
llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
Modified: llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp?rev=112329&r1=112328&r2=112329&view=diff
==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp (original)
+++ llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp Fri Aug 27 18:57:52 2010
@@ -193,20 +193,17 @@
return false;
ARM_AM::AMSubMode Mode = ARM_AM::ia;
+ // VFP and Thumb2 do not support IB or DA modes.
bool isNotVFP = isi32Load(Opcode) || isi32Store(Opcode);
- if (isNotVFP && Offset == 4) {
- if (isThumb2)
- // Thumb2 does not support ldmib / stmib.
- return false;
+ bool haveIBAndDA = isNotVFP && !isThumb2;
+ if (Offset == 4 && haveIBAndDA)
Mode = ARM_AM::ib;
- } else if (isNotVFP && Offset == -4 * (int)NumRegs + 4) {
- if (isThumb2)
- // Thumb2 does not support ldmda / stmda.
- return false;
+ else if (Offset == -4 * (int)NumRegs + 4 && haveIBAndDA)
Mode = ARM_AM::da;
- } else if (isNotVFP && Offset == -4 * (int)NumRegs) {
+ else if (Offset == -4 * (int)NumRegs && isNotVFP)
+ // VLDM/VSTM do not support DB mode without also updating the base reg.
Mode = ARM_AM::db;
- } else if (Offset != 0) {
+ else if (Offset != 0) {
// If starting offset isn't zero, insert a MI to materialize a new base.
// But only do so if it is cost effective, i.e. merging more than two
// loads / stores.
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