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Fix crasher introduced in r200203 and caught by a libc++ buildbot. Don't assume that getMulExpr returns a SCEVMulExpr, it may have simplified it to something else!

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llvm-svn: 200210
This commit is contained in:
Nick Lewycky 2014-01-27 10:47:44 +00:00
parent baf1d18cf0
commit 30a25a7139
2 changed files with 12 additions and 1 deletions
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4
lib/Analysis/ScalarEvolution.cpp
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@ -2292,7 +2292,9 @@ const SCEV *ScalarEvolution::getUDivExactExpr(const SCEV *LHS,
Operands.append(Mul->op_begin() + 1, Mul->op_end());
LHS = getMulExpr(Operands);
RHS = RHSCst;
Mul = cast<SCEVMulExpr>(LHS);
Mul = dyn_cast<SCEVMulExpr>(LHS);
if (!Mul)
return getUDivExactExpr(LHS, RHS);
}
}
}

9
test/Analysis/ScalarEvolution/fold.ll
View File

@ -77,3 +77,12 @@ define void @test5(i32 %i) {
; CHECK: --> (-2147483648 * (%i /u -2147483648))
ret void
}
define void @test6(i8 %x) {
; CHECK-LABEL: @test6
%A = zext i8 %x to i16
%B = shl nuw i16 %A, 8
%C = and i16 %B, -2048
; CHECK: --> (2048 * ((zext i8 %x to i16) /u 8))
ret void
}