Changes in directory llvm/lib/Target/IA64:
IA64ISelDAGToDAG.cpp updated: 1.23 -> 1.24
---
Log message:
fixing divides
---
Diffs of the changes: (+9 -12)
IA64ISelDAGToDAG.cpp | 21 +++++++++------------
1 files changed, 9 insertions(+), 12 deletions(-)
Index: llvm/lib/Target/IA64/IA64ISelDAGToDAG.cpp
diff -u llvm/lib/Target/IA64/IA64ISelDAGToDAG.cpp:1.23
llvm/lib/Target/IA64/IA64ISelDAGToDAG.cpp:1.24
--- llvm/lib/Target/IA64/IA64ISelDAGToDAG.cpp:1.23 Mon Jan 16 08:33:04 2006
+++ llvm/lib/Target/IA64/IA64ISelDAGToDAG.cpp Mon Jan 16 19:19:49 2006
@@ -228,6 +228,8 @@
TmpPR = TmpF5.getValue(1);
Chain = TmpF5.getValue(2);
+ Chain = CurDAG->getCopyToReg(Chain, IA64::F8, TmpF5);
+
SDOperand minusB;
if(isModulus) { // for remainders, it'll be handy to have
// copies of -input_b
@@ -287,23 +289,18 @@
TmpR2 = CurDAG->getTargetNode(IA64::CFNMAS1, MVT::f64,
TmpF4, TmpQ2, TmpF3, TmpPR);
Chain = TmpR2.getValue(1);
-
+
// we want TmpQ3 to have the same target register as the frcpa? maybe we
// should two-address hack it. See the comment "for this to work..." on page
// 48 of Intel application note #245415
- TmpQ3 = CurDAG->getTargetNode(IA64::CFMAS1, MVT::f64,
- TmpR2, TmpY2, TmpQ2, TmpPR);
+ TmpQ3 = CurDAG->getTargetNode(IA64::TCFMAS1, MVT::f64,
+ TmpF5, TmpR2, TmpY2, TmpQ2, TmpPR);
Chain = TmpQ3.getValue(1);
- // FIXME: this is unfortunate :(
- // the story is that the dest reg of the fnma above and the fma below it
- // (and therefore the src of the fcvt.fx[u] below as well) cannot
- // be the same register, or this code breaks if the first argument is
- // zero. (e.g. without this hack, 0%8 yields -64, not 0.)
-/* XXX: these two lines do nothing */
- SDOperand bogus = CurDAG->getTargetNode(IA64::IUSE, MVT::Other, TmpR2);
- Chain = bogus.getValue(0);
-
+ // STORY: without these two-address instructions (TCFMAS1 and TCFMADS0)
+ // the FPSWA won't be able to help out in the case of large/tiny
+ // arguments. Other fun bugs may also appear, e.g. 0/x = x, not 0.
+
if(isSigned)
TmpQ = CurDAG->getTargetNode(IA64::FCVTFXTRUNCS1, MVT::f64, TmpQ3);
else
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