[llvm-commits] [llvm] r72756 - in /llvm/trunk: lib/Target/ARM/ARMLoadStoreOptimizer.cpp test/CodeGen/ARM/str_pre-2.ll

[Evan Cheng]

Author: evancheng
Date: Wed Jun  3 01:14:58 2009
New Revision: 72756

URL: http://llvm.org/viewvc/llvm-project?rev=72756&view=rev
Log:
Fold preceding / trailing base inc / dec into the single load / store as well.

Added:
    llvm/trunk/test/CodeGen/ARM/str_pre-2.ll
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=72756&r1=72755&r2=72756&view=diff

==============================================================================
--- llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp (original)
+++ llvm/trunk/lib/Target/ARM/ARMLoadStoreOptimizer.cpp Wed Jun  3 01:14:58 2009
@@ -697,7 +697,7 @@
         // LDM/STM ops.
         for (unsigned i = 0, e = MBBII.size(); i < e; ++i)
           if (mergeBaseUpdateLSMultiple(MBB, MBBII[i], Advance, MBBI))
-            NumMerges++;
+            ++NumMerges;
         NumMerges += MBBII.size();
 
         // Try folding preceeding/trailing base inc/dec into those load/store
@@ -705,10 +705,17 @@
         for (unsigned i = 0; i != NumMemOps; ++i)
           if (!MemOps[i].Merged)
             if (mergeBaseUpdateLoadStore(MBB, MemOps[i].MBBI, TII,Advance,MBBI))
-              NumMerges++;
+              ++NumMerges;
 
         // RS may be pointing to an instruction that's deleted. 
         RS->skipTo(prior(MBBI));
+      } else if (NumMemOps == 1) {
+        // Try folding preceeding/trailing base inc/dec into the single
+        // load/store.
+        if (mergeBaseUpdateLoadStore(MBB, MemOps[0].MBBI, TII, Advance, MBBI)) {
+          ++NumMerges;
+          RS->skipTo(prior(MBBI));
+        }
       }
 
       CurrBase = 0;

Added: llvm/trunk/test/CodeGen/ARM/str_pre-2.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/ARM/str_pre-2.ll?rev=72756&view=auto

==============================================================================
--- llvm/trunk/test/CodeGen/ARM/str_pre-2.ll (added)
+++ llvm/trunk/test/CodeGen/ARM/str_pre-2.ll Wed Jun  3 01:14:58 2009
@@ -0,0 +1,12 @@
+; RUN: llvm-as < %s | llc -mtriple=arm-linux-gnu | grep {str.*\\!}
+; RUN: llvm-as < %s | llc -mtriple=arm-linux-gnu | grep {ldr.*\\\[.*\], #+4}
+
+ at b = external global i64*
+
+define i64 @t(i64 %a) nounwind readonly {
+entry:
+	%0 = load i64** @b, align 4
+	%1 = load i64* %0, align 4
+	%2 = mul i64 %1, %a
+	ret i64 %2
+}