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fix PR3995. A scale must be 1, 2, 4 or 8. 

llvm-svn: 69284
This commit is contained in:
Rafael Espindola 2009-04-16 12:34:53 +00:00
parent 092f0ccd9c
commit 5e42177a0f
2 changed files with 24 additions and 1 deletions
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2
llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
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@ -1041,7 +1041,7 @@ bool X86DAGToDAGISel::MatchAddress(SDValue N, X86ISelAddressMode &AM,
// a scaled index. // a scaled index.
if (Shift.getOpcode() == ISD::SRL && Shift.hasOneUse()) { if (Shift.getOpcode() == ISD::SRL && Shift.hasOneUse()) {
unsigned ScaleLog = 8 - C1->getZExtValue(); unsigned ScaleLog = 8 - C1->getZExtValue();
if (ScaleLog > 0 && ScaleLog < 64 && if (ScaleLog > 0 && ScaleLog < 4 &&
C2->getZExtValue() == (UINT64_C(0xff) << ScaleLog)) { C2->getZExtValue() == (UINT64_C(0xff) << ScaleLog)) {
SDValue Eight = CurDAG->getConstant(8, MVT::i8); SDValue Eight = CurDAG->getConstant(8, MVT::i8);
SDValue Mask = CurDAG->getConstant(0xff, N.getValueType()); SDValue Mask = CurDAG->getConstant(0xff, N.getValueType());

23
llvm/test/CodeGen/X86/2009-04-scale.ll Normal file
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@ -0,0 +1,23 @@
; RUN: llvm-as < %s | llc -march=x86 -mtriple=i386-unknown-linux-gnu
; PR3995
%struct.vtable = type { i32 (...)** }
%struct.array = type { %struct.impl, [256 x %struct.pair], [256 x %struct.pair], [256 x %struct.pair], [256 x %struct.pair], [256 x %struct.pair], [256 x %struct.pair] }
%struct.impl = type { %struct.vtable, i8, %struct.impl*, i32, i32, i64, i64 }
%struct.pair = type { i64, i64 }
define void @test() {
entry:
%0 = load i32* null, align 4 ; <i32> [#uses=1]
%1 = lshr i32 %0, 8 ; <i32> [#uses=1]
%2 = and i32 %1, 255 ; <i32> [#uses=1]
%3 = getelementptr %struct.array* null, i32 0, i32 3 ; <[256 x %struct.pair]*> [#uses=1]
%4 = getelementptr [256 x %struct.pair]* %3, i32 0, i32 %2 ; <%struct.pair*> [#uses=1]
%5 = getelementptr %struct.pair* %4, i32 0, i32 1 ; <i64*> [#uses=1]
%6 = load i64* %5, align 4 ; <i64> [#uses=1]
%7 = xor i64 0, %6 ; <i64> [#uses=1]
%8 = xor i64 %7, 0 ; <i64> [#uses=1]
%9 = xor i64 %8, 0 ; <i64> [#uses=1]
store i64 %9, i64* null, align 8
unreachable
}