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Fix a crasher newly introduced in r176659/r176649, where fast-isel tries to 

lower an expect intrinsic that is a constant expression.

llvm-svn: 176830
This commit is contained in:
Nick Lewycky 2013-03-11 21:44:37 +00:00
parent 2eb7195ee6
commit 48beb21185
2 changed files with 25 additions and 0 deletions
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2
llvm/lib/CodeGen/SelectionDAG/FastISel.cpp
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@ -698,6 +698,8 @@ bool FastISel::SelectCall(const User *I) {
} }
case Intrinsic::expect: { case Intrinsic::expect: {
unsigned ResultReg = getRegForValue(Call->getArgOperand(0)); unsigned ResultReg = getRegForValue(Call->getArgOperand(0));
if (ResultReg == 0)
return false;
UpdateValueMap(Call, ResultReg); UpdateValueMap(Call, ResultReg);
return true; return true;
} }

23
llvm/test/CodeGen/X86/fast-isel-expect.ll Normal file
View File

@ -0,0 +1,23 @@
; RUN: llc < %s -O0 -march=x86 | 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-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@glbl = extern_weak constant i8
declare i64 @llvm.expect.i64(i64, i64) #0
define void @test() {
; CHECK: movl $glbl
%tmp = call i64 @llvm.expect.i64(i64 zext (i1 icmp eq (i8* @glbl, i8* null) to i64), i64 0)
%tmp2 = icmp ne i64 %tmp, 0
br i1 %tmp2, label %bb1, label %bb2
bb1:
unreachable
bb2:
unreachable
}
attributes #0 = { nounwind readnone }