Changes in directory llvm/lib/CodeGen/SelectionDAG:
DAGCombiner.cpp updated: 1.72 -> 1.73
---
Log message:
fold (conv (load x)) -> (load (conv*)x).
This allows us to compile this:
void foo(double);
void bar(double *X) { foo(*X); }
To this:
bar:
save -96, %o6, %o6
ld [%i0+4], %o1
ld [%i0], %o0
call foo
nop
restore %g0, %g0, %g0
retl
nop
instead of this:
bar:
save -104, %o6, %o6
ldd [%i0], %f0
std %f0, [%i6+-8]
ld [%i6+-4], %o1
ld [%i6+-8], %o0
call foo
nop
restore %g0, %g0, %g0
retl
nop
on SparcV8.
---
Diffs of the changes: (+10 -0)
DAGCombiner.cpp | 10 ++++++++++
1 files changed, 10 insertions(+)
Index: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
diff -u llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.72
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.73
--- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp:1.72 Thu Dec 22 23:37:50 2005
+++ llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp Thu Dec 22 23:44:41 2005
@@ -1760,6 +1760,16 @@
if (N0.getOpcode() == ISD::BIT_CONVERT) // conv(conv(x,t1),t2) -> conv(x,t2)
return DAG.getNode(ISD::BIT_CONVERT, VT, N0.getOperand(0));
+ // fold (conv (load x)) -> (load (conv*)x)
+ if (N0.getOpcode() == ISD::LOAD && N0.hasOneUse()) {
+ SDOperand Load = DAG.getLoad(VT, N0.getOperand(0), N0.getOperand(1),
+ N0.getOperand(2));
+ WorkList.push_back(N);
+ CombineTo(N0.Val, DAG.getNode(ISD::BIT_CONVERT, N0.getValueType(), Load),
+ Load.getValue(1));
+ return Load;
+ }
+
return SDOperand();
}
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