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llvm-project/llvm/test/CodeGen/SystemZ/int-cmp-52.ll

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[SystemZ] Fix assertion failure in adjustSubwordCmp 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. llvm-svn: 255786
2015-12-17 02:04:06 +08:00
; This used to crash the backend due to a failed assertion.
; No particular output expected, but must compile.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu
define void @test(i16 *%input, i32 *%result) {
entry:
%0 = load i16, i16* %input, align 2
%1 = zext i16 %0 to i32
%2 = icmp slt i32 %1, 0
br i1 %2, label %if.then, label %if.else
if.then:
store i32 1, i32* %result, align 4
br label %return
if.else:
store i32 0, i32* %result, align 4
br label %return
return:
ret void
}