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X86 Lowering - Fixed a crash in ICMP scalar instruction

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Fixed a bug in EmitTest() function in combining shl + icmp.

https://llvm.org/bugs/show_bug.cgi?id=28119



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273899 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Elena Demikhovsky 2016-06-27 18:07:16 +00:00
parent d96514bcfe
commit 89fca4c1b1
2 changed files with 33 additions and 4 deletions
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6
lib/Target/X86/X86ISelLowering.cpp
View File

@ -14597,10 +14597,8 @@ SDValue X86TargetLowering::EmitTest(SDValue Op, unsigned X86CC, const SDLoc &dl,
: APInt::getLowBitsSet(BitWidth, BitWidth - ShAmt);
if (!Mask.isSignedIntN(32)) // Avoid large immediates.
break;
SDValue New = DAG.getNode(ISD::AND, dl, VT, Op->getOperand(0),
DAG.getConstant(Mask, dl, VT));
DAG.ReplaceAllUsesWith(Op, New);
Op = New;
Op = DAG.getNode(ISD::AND, dl, VT, Op->getOperand(0),
DAG.getConstant(Mask, dl, VT));
}
break;

31
test/CodeGen/X86/2016-06-28-ICmpCrash.ll Normal file
View File

@ -0,0 +1,31 @@
;RUN: llc < %s -mcpu=core-avx2
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%struct.struct_1 = type { i24 }
@a = global i8 0, align 1
@b = global i8 0, align 1
@d = global i8 0, align 1
@e = global i8 0, align 1
@c = global %struct.struct_1 zeroinitializer, align 4
; Function Attrs: norecurse nounwind uwtable
define void @_Z3fn1v() #0 {
%bf.load = load i32, i32* bitcast (%struct.struct_1* @c to i32*), align 4
%bf.shl = shl i32 %bf.load, 8
%bf.ashr = ashr exact i32 %bf.shl, 8
%tobool4 = icmp ne i32 %bf.ashr, 0
%conv = zext i1 %tobool4 to i32
%x1 = load i8, i8* @e, align 1
%conv6 = zext i8 %x1 to i32
%add = add nuw nsw i32 %conv, %conv6
%tobool7 = icmp ne i32 %add, 0
%frombool = zext i1 %tobool7 to i8
store i8 %frombool, i8* @b, align 1
%tobool14 = icmp ne i32 %bf.shl, 0
%frombool15 = zext i1 %tobool14 to i8
store i8 %frombool15, i8* @d, align 1
ret void
}