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Fix PR15632: No support for ppcf128 floating-point remainder on PowerPC.

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For this we need to use a libcall.  Previously LLVM didn't implement
libcall support for frem, so I've added it in the usual
straightforward manner.  A test case from the bug report is included.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178639 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Schmidt 2013-04-03 13:05:44 +00:00
parent 4385f5dfce
commit cd7a1558ed
4 changed files with 28 additions and 0 deletions
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11
lib/CodeGen/SelectionDAG/LegalizeFloatTypes.cpp
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@ -824,6 +824,7 @@ void DAGTypeLegalizer::ExpandFloatResult(SDNode *N, unsigned ResNo) {
case ISD::LOAD: ExpandFloatRes_LOAD(N, Lo, Hi); break;
case ISD::SINT_TO_FP:
case ISD::UINT_TO_FP: ExpandFloatRes_XINT_TO_FP(N, Lo, Hi); break;
case ISD::FREM: ExpandFloatRes_FREM(N, Lo, Hi); break;
}
// If Lo/Hi is null, the sub-method took care of registering results etc.
@ -1051,6 +1052,16 @@ void DAGTypeLegalizer::ExpandFloatRes_FPOWI(SDNode *N,
GetPairElements(Call, Lo, Hi);
}
void DAGTypeLegalizer::ExpandFloatRes_FREM(SDNode *N,
SDValue &Lo, SDValue &Hi) {
SDValue Call = LibCallify(GetFPLibCall(N->getValueType(0),
RTLIB::REM_F32, RTLIB::REM_F64,
RTLIB::REM_F80, RTLIB::REM_F128,
RTLIB::REM_PPCF128),
N, false);
GetPairElements(Call, Lo, Hi);
}
void DAGTypeLegalizer::ExpandFloatRes_FRINT(SDNode *N,
SDValue &Lo, SDValue &Hi) {
SDValue Call = LibCallify(GetFPLibCall(N->getValueType(0),

1
lib/CodeGen/SelectionDAG/LegalizeTypes.h
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@ -465,6 +465,7 @@ private:
void ExpandFloatRes_FP_EXTEND (SDNode *N, SDValue &Lo, SDValue &Hi);
void ExpandFloatRes_FPOW (SDNode *N, SDValue &Lo, SDValue &Hi);
void ExpandFloatRes_FPOWI (SDNode *N, SDValue &Lo, SDValue &Hi);
void ExpandFloatRes_FREM (SDNode *N, SDValue &Lo, SDValue &Hi);
void ExpandFloatRes_FRINT (SDNode *N, SDValue &Lo, SDValue &Hi);
void ExpandFloatRes_FSIN (SDNode *N, SDValue &Lo, SDValue &Hi);
void ExpandFloatRes_FSQRT (SDNode *N, SDValue &Lo, SDValue &Hi);

1
lib/Target/PowerPC/PPCISelLowering.cpp
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@ -116,6 +116,7 @@ PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
setOperationAction(ISD::FTRUNC, MVT::ppcf128, Expand);
setOperationAction(ISD::FRINT, MVT::ppcf128, Expand);
setOperationAction(ISD::FNEARBYINT, MVT::ppcf128, Expand);
setOperationAction(ISD::FREM, MVT::ppcf128, Expand);
// PowerPC has no SREM/UREM instructions
setOperationAction(ISD::SREM, MVT::i32, Expand);

15
test/CodeGen/PowerPC/pr15632.ll Normal file
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@ -0,0 +1,15 @@
; RUN: llc -mcpu=pwr7 -O0 < %s | FileCheck %s
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
declare void @other(ppc_fp128 %tmp70)
define void @bug() {
entry:
%tmp70 = frem ppc_fp128 0xM00000000000000000000000000000000, undef
call void @other(ppc_fp128 %tmp70)
unreachable
}
; CHECK: bl fmodl