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LowerFP_TO_SINT must not create a stack object if it's not needed.

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llvm-svn: 43004
This commit is contained in:
Evan Cheng 2007-10-15 20:11:21 +00:00
parent b4a9a2e418
commit f5bcd3d737
2 changed files with 24 additions and 6 deletions
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12
lib/Target/X86/X86ISelLowering.cpp
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@ -3895,13 +3895,7 @@ SDOperand X86TargetLowering::LowerSINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
SDOperand X86TargetLowering::LowerFP_TO_SINT(SDOperand Op, SelectionDAG &DAG) {
assert(Op.getValueType() <= MVT::i64 && Op.getValueType() >= MVT::i16 &&
"Unknown FP_TO_SINT to lower!");
// We lower FP->sint64 into FISTP64, followed by a load, all to a temporary
// stack slot.
SDOperand Result;
MachineFunction &MF = DAG.getMachineFunction();
unsigned MemSize = MVT::getSizeInBits(Op.getValueType())/8;
int SSFI = MF.getFrameInfo()->CreateStackObject(MemSize, MemSize);
SDOperand StackSlot = DAG.getFrameIndex(SSFI, getPointerTy());
// These are really Legal.
if (Op.getValueType() == MVT::i32 &&
@ -3915,6 +3909,12 @@ SDOperand X86TargetLowering::LowerFP_TO_SINT(SDOperand Op, SelectionDAG &DAG) {
Op.getOperand(0).getValueType() != MVT::f80)
return Result;
// We lower FP->sint64 into FISTP64, followed by a load, all to a temporary
// stack slot.
MachineFunction &MF = DAG.getMachineFunction();
unsigned MemSize = MVT::getSizeInBits(Op.getValueType())/8;
int SSFI = MF.getFrameInfo()->CreateStackObject(MemSize, MemSize);
SDOperand StackSlot = DAG.getFrameIndex(SSFI, getPointerTy());
unsigned Opc;
switch (Op.getValueType()) {
default: assert(0 && "Invalid FP_TO_SINT to lower!");

18
test/CodeGen/X86/fp2sint.ll Normal file
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@ -0,0 +1,18 @@
;; LowerFP_TO_SINT should not create a stack object if it's not needed.
; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2 | not grep add
define i32 @main(i32 %argc, i8** %argv) {
cond_false.i.i.i: ; preds = %bb.i5
%tmp35.i = load double* null, align 8 ; <double> [#uses=1]
%tmp3536.i = fptosi double %tmp35.i to i32 ; <i32> [#uses=1]
%tmp3536140.i = zext i32 %tmp3536.i to i64 ; <i64> [#uses=1]
%tmp39.i = load double* null, align 4 ; <double> [#uses=1]
%tmp3940.i = fptosi double %tmp39.i to i32 ; <i32> [#uses=1]
%tmp3940137.i = zext i32 %tmp3940.i to i64 ; <i64> [#uses=1]
%tmp3940137138.i = shl i64 %tmp3940137.i, 32 ; <i64> [#uses=1]
%tmp3940137138.ins.i = or i64 %tmp3940137138.i, %tmp3536140.i ; <i64> [#uses=1]
%tmp95.i.i = trunc i64 %tmp3940137138.ins.i to i32 ; <i32> [#uses=1]
store i32 %tmp95.i.i, i32* null, align 4
ret i32 0
}