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PR3686: make the legalizer handle bitcast from i80 to x86 long double.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66021 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Friedman 2009-03-04 06:23:34 +00:00
parent 29582d1223
commit 27759f41ca
3 changed files with 20 additions and 0 deletions
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7
lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
View File

@ -667,6 +667,7 @@ bool DAGTypeLegalizer::PromoteIntegerOperand(SDNode *N, unsigned OpNo) {
abort();
case ISD::ANY_EXTEND: Res = PromoteIntOp_ANY_EXTEND(N); break;
case ISD::BIT_CONVERT: Res = PromoteIntOp_BIT_CONVERT(N); break;
case ISD::BR_CC: Res = PromoteIntOp_BR_CC(N, OpNo); break;
case ISD::BRCOND: Res = PromoteIntOp_BRCOND(N, OpNo); break;
case ISD::BUILD_PAIR: Res = PromoteIntOp_BUILD_PAIR(N); break;
@ -745,6 +746,12 @@ SDValue DAGTypeLegalizer::PromoteIntOp_ANY_EXTEND(SDNode *N) {
return DAG.getNode(ISD::ANY_EXTEND, N->getDebugLoc(), N->getValueType(0), Op);
}
SDValue DAGTypeLegalizer::PromoteIntOp_BIT_CONVERT(SDNode *N) {
// This should only occur in unusual situations like bitcasting to an
// x86_fp80, so just turn it into a store+load
return CreateStackStoreLoad(N->getOperand(0), N->getValueType(0));
}
SDValue DAGTypeLegalizer::PromoteIntOp_BR_CC(SDNode *N, unsigned OpNo) {
assert(OpNo == 2 && "Don't know how to promote this operand!");

1
lib/CodeGen/SelectionDAG/LegalizeTypes.h
View File

@ -285,6 +285,7 @@ private:
// Integer Operand Promotion.
bool PromoteIntegerOperand(SDNode *N, unsigned OperandNo);
SDValue PromoteIntOp_ANY_EXTEND(SDNode *N);
SDValue PromoteIntOp_BIT_CONVERT(SDNode *N);
SDValue PromoteIntOp_BUILD_PAIR(SDNode *N);
SDValue PromoteIntOp_BR_CC(SDNode *N, unsigned OpNo);
SDValue PromoteIntOp_BRCOND(SDNode *N, unsigned OpNo);

12
test/CodeGen/X86/2009-03-03-BitcastLongDouble.ll Normal file
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@ -0,0 +1,12 @@
; RUN: llvm-as < %s | llc -march=x86
; PR3686
define i32 @x(i32 %y) nounwind readnone {
entry:
%tmp14 = zext i32 %y to i80 ; <i80> [#uses=1]
%tmp15 = bitcast i80 %tmp14 to x86_fp80 ; <x86_fp80> [#uses=1]
%add = add x86_fp80 %tmp15, 0xK3FFF8000000000000000 ; <x86_fp80> [#uses=1]
%tmp11 = bitcast x86_fp80 %add to i80 ; <i80> [#uses=1]
%tmp10 = trunc i80 %tmp11 to i32 ; <i32> [#uses=1]
ret i32 %tmp10
}