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Correct some thinkos in the expansion of ADD/SUB

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when the target does not support ADDC/SUBC.  This
fixes PR3044.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59120 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands 2008-11-12 08:23:26 +00:00
parent e7c3551e6f
commit 245146b58a
2 changed files with 21 additions and 6 deletions
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13
lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
View File

@ -1228,7 +1228,6 @@ void DAGTypeLegalizer::ExpandIntRes_ADDSUB(SDNode *N,
GetExpandedInteger(N->getOperand(1), RHSL, RHSH);
MVT NVT = LHSL.getValueType();
SDVTList VTList = DAG.getVTList(NVT, MVT::Flag);
SDValue LoOps[2] = { LHSL, RHSL };
SDValue HiOps[3] = { LHSH, RHSH };
@ -1242,6 +1241,7 @@ void DAGTypeLegalizer::ExpandIntRes_ADDSUB(SDNode *N,
TLI.getTypeToExpandTo(NVT));
if (hasCarry) {
SDVTList VTList = DAG.getVTList(NVT, MVT::Flag);
if (N->getOpcode() == ISD::ADD) {
Lo = DAG.getNode(ISD::ADDC, VTList, LoOps, 2);
HiOps[2] = Lo.getValue(1);
@ -1253,8 +1253,8 @@ void DAGTypeLegalizer::ExpandIntRes_ADDSUB(SDNode *N,
}
} else {
if (N->getOpcode() == ISD::ADD) {
Lo = DAG.getNode(ISD::ADD, VTList, LoOps, 2);
Hi = DAG.getNode(ISD::ADD, VTList, HiOps, 2);
Lo = DAG.getNode(ISD::ADD, NVT, LoOps, 2);
Hi = DAG.getNode(ISD::ADD, NVT, HiOps, 2);
SDValue Cmp1 = DAG.getSetCC(TLI.getSetCCResultType(Lo), Lo, LoOps[0],
ISD::SETULT);
SDValue Carry1 = DAG.getNode(ISD::SELECT, NVT, Cmp1,
@ -1266,9 +1266,10 @@ void DAGTypeLegalizer::ExpandIntRes_ADDSUB(SDNode *N,
DAG.getConstant(1, NVT), Carry1);
Hi = DAG.getNode(ISD::ADD, NVT, Hi, Carry2);
} else {
Lo = DAG.getNode(ISD::SUB, VTList, LoOps, 2);
Hi = DAG.getNode(ISD::SUB, VTList, HiOps, 2);
SDValue Cmp = DAG.getSetCC(NVT, LoOps[0], LoOps[1], ISD::SETULT);
Lo = DAG.getNode(ISD::SUB, NVT, LoOps, 2);
Hi = DAG.getNode(ISD::SUB, NVT, HiOps, 2);
SDValue Cmp = DAG.getSetCC(TLI.getSetCCResultType(LoOps[0]),
LoOps[0], LoOps[1], ISD::SETULT);
SDValue Borrow = DAG.getNode(ISD::SELECT, NVT, Cmp,
DAG.getConstant(1, NVT),
DAG.getConstant(0, NVT));

14
test/CodeGen/Alpha/2008-11-12-Add128.ll Normal file
View File

@ -0,0 +1,14 @@
; RUN: llvm-as < %s | llc
; PR3044
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-f128:128:128"
target triple = "alphaev6-unknown-linux-gnu"
define i128 @__mulvti3(i128 %u, i128 %v) nounwind {
entry:
%0 = load i128* null, align 16 ; <i128> [#uses=1]
%1 = load i64* null, align 8 ; <i64> [#uses=1]
%2 = zext i64 %1 to i128 ; <i128> [#uses=1]
%3 = add i128 %2, %0 ; <i128> [#uses=1]
store i128 %3, i128* null, align 16
unreachable
}