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When constant double 0.0 is lowered, make sure 0 is copied directly from an

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integer register to a floating point register. It is not valid to interpret
the value of a floating pointer register as part of a double precision
floating point value after a single precision floating point computational
or move instruction stores its result to the register.

- In the test case, the following code is generated before this patch is
  applied:
mtc1  $zero, $f2    ; unformatted copy to $f2
mov.s $f0, $f2      ; $f0 is in single format
sdc1  $f12, 0($sp)
mov.s $f1, $f2      ; $f1 is in single format
c.eq.d  $f12, $f0   ; $f0 cannot be interpreted as double

- The following code is generated after this patch is applied:
mtc1  $zero, $f0    ; unformatted copy to $f0
mtc1  $zero, $f1    ; unformatted copy to $f1
c.eq.d  $f12, $f0   ; $f0 can be interpreted as double

Bhanu Chetlapalli and Chris Dearman at MIPS technologies reported this bug and
provided the test case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137484 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2011-08-12 18:09:59 +00:00
parent d95f8f6ada
commit 0285e7d1c1
1 changed files with 2 additions and 9 deletions
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11
lib/Target/Mips/MipsISelDAGToDAG.cpp
View File

@ -417,15 +417,8 @@ SDNode* MipsDAGToDAGISel::Select(SDNode *Node) {
if (Node->getValueType(0) == MVT::f64 && CN->isExactlyValue(+0.0)) {
SDValue Zero = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl,
Mips::ZERO, MVT::i32);
SDValue Undef = SDValue(
CurDAG->getMachineNode(TargetOpcode::IMPLICIT_DEF, dl, MVT::f64), 0);
SDNode *MTC = CurDAG->getMachineNode(Mips::MTC1, dl, MVT::f32, Zero);
SDValue I0 = CurDAG->getTargetInsertSubreg(Mips::sub_fpeven, dl,
MVT::f64, Undef, SDValue(MTC, 0));
SDValue I1 = CurDAG->getTargetInsertSubreg(Mips::sub_fpodd, dl,
MVT::f64, I0, SDValue(MTC, 0));
ReplaceUses(SDValue(Node, 0), I1);
return I1.getNode();
return CurDAG->getMachineNode(Mips::BuildPairF64, dl, MVT::f64, Zero,
Zero);
}
break;
}