xref: /llvm-project/llvm/test/Transforms/InstCombine/pr44541.ll (revision c00f49cf12ff2916a372176f2154a83eb80f1692)
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -S -passes=instcombine < %s | FileCheck %s
3
4; This test used to cause an infinite combine loop.
5
6define i16 @passthru(i16 returned %x) {
7; CHECK-LABEL: @passthru(
8; CHECK-NEXT:    ret i16 [[X:%.*]]
9;
10  ret i16 %x
11}
12
13define i16 @test(i16 %arg) {
14; CHECK-LABEL: @test(
15; CHECK-NEXT:    [[ZERO:%.*]] = call i16 @passthru(i16 0)
16; CHECK-NEXT:    [[RET:%.*]] = call i16 @llvm.smax.i16(i16 [[ARG:%.*]], i16 0)
17; CHECK-NEXT:    ret i16 [[RET]]
18;
19  %zero = call i16 @passthru(i16 0)
20  %sub = sub nuw nsw i16 %arg, %zero
21  %cmp = icmp slt i16 %sub, 0
22  %ret = select i1 %cmp, i16 0, i16 %sub
23  ret i16 %ret
24}
25