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328f32455c
When comparing a zero-extended value against a constant small enough to
be in range of the inner type, it doesn't matter whether a signed or
unsigned compare operation (for the outer type) is being used. This is
why the code in adjustSubwordCmp had this assertion:
assert(C.ICmpType == SystemZICMP::Any &&
"Signedness shouldn't matter here.");
assuming the the caller had already detected that fact. However, it
turns out that there cases, in particular with always-true or always-
false conditions that have not been eliminated when compiling at -O0,
where this is not true.
Instead of failing an assertion if C.ICmpType is not SystemZICMP::Any
here, we can simply *set* it safely to SystemZICMP::Any, however.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255786 91177308-0d34-0410-b5e6-96231b3b80d8
25 lines
497 B
LLVM
25 lines
497 B
LLVM
; This used to crash the backend due to a failed assertion.
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; No particular output expected, but must compile.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu
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define void @test(i16 *%input, i32 *%result) {
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entry:
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%0 = load i16, i16* %input, align 2
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%1 = zext i16 %0 to i32
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%2 = icmp slt i32 %1, 0
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br i1 %2, label %if.then, label %if.else
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if.then:
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store i32 1, i32* %result, align 4
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br label %return
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if.else:
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store i32 0, i32* %result, align 4
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br label %return
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return:
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ret void
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}
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