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Fix a codegen abort seen in 483.xalancbmk.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93417 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2010-01-14 03:08:49 +00:00
parent e8f422b9f3
commit ff00a55517
2 changed files with 23 additions and 0 deletions
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3
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1684,6 +1684,9 @@ SDValue DAGCombiner::SimplifyBinOpWithSameOpcodeHands(SDNode *N) {
EVT VT = N0.getValueType();
assert(N0.getOpcode() == N1.getOpcode() && "Bad input!");
// Bail early if none of these transforms apply.
if (N0.getNode()->getNumOperands() == 0) return SDValue();
// For each of OP in AND/OR/XOR:
// fold (OP (zext x), (zext y)) -> (zext (OP x, y))
// fold (OP (sext x), (sext y)) -> (sext (OP x, y))

20
test/CodeGen/X86/br-fold.ll Normal file
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@ -0,0 +1,20 @@
; RUN: llc -march=x86-64 < %s | FileCheck %s
; CHECK: orq
; CHECK-NEXT: jne
@_ZN11xercesc_2_513SchemaSymbols21fgURI_SCHEMAFORSCHEMAE = external constant [33 x i16], align 32 ; <[33 x i16]*> [#uses=1]
@_ZN11xercesc_2_56XMLUni16fgNotationStringE = external constant [9 x i16], align 16 ; <[9 x i16]*> [#uses=1]
define fastcc void @foo() {
entry:
br i1 icmp eq (i64 or (i64 ptrtoint ([33 x i16]* @_ZN11xercesc_2_513SchemaSymbols21fgURI_SCHEMAFORSCHEMAE to i64),
i64 ptrtoint ([9 x i16]* @_ZN11xercesc_2_56XMLUni16fgNotationStringE to i64)), i64 0),
label %bb8.i329, label %bb4.i.i318.preheader
bb4.i.i318.preheader: ; preds = %bb6
unreachable
bb8.i329: ; preds = %bb6
unreachable
}