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Add original reproducer for r307754 / PR33689

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Apparently I managed to drop the test case between two revisions in
Phabricator: https://reviews.llvm.org/D35003

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307887 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Mikael Holmen 2017-07-13 07:38:53 +00:00
parent ff281e5fb6
commit 3e55e45537
1 changed files with 53 additions and 0 deletions
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53
test/Transforms/InstCombine/pr33689_same_bitwidth.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -instcombine %s -o - | FileCheck %s
; All the "useless" instructions should be removed and we shouldn't crash.
target datalayout = "p:16:16"
%i64_t = type i64
@a = external global i16
@b = external global i16*
define void @f() {
; CHECK-LABEL: @f(
; CHECK-NEXT: bb0:
; CHECK-NEXT: [[TMP12:%.*]] = alloca [2 x i32], align 8
; CHECK-NEXT: [[TMP12_SUB:%.*]] = getelementptr inbounds [2 x i32], [2 x i32]* [[TMP12]], i16 0, i16 0
; CHECK-NEXT: br i1 undef, label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[TMP8:%.*]] = ptrtoint [2 x i32]* [[TMP12]] to i16
; CHECK-NEXT: store i16 [[TMP8]], i16* @a, align 2
; CHECK-NEXT: unreachable
; CHECK: bb2:
; CHECK-NEXT: [[TMP9:%.*]] = load i16*, i16** @b, align 2
; CHECK-NEXT: store i16 0, i16* [[TMP9]], align 2
; CHECK-NEXT: [[TMP10:%.*]] = load i32, i32* [[TMP12_SUB]], align 8
; CHECK-NEXT: [[TMP11:%.*]] = add i32 [[TMP10]], -1
; CHECK-NEXT: store i32 [[TMP11]], i32* [[TMP12_SUB]], align 8
; CHECK-NEXT: ret void
;
bb0:
%tmp1 = alloca %i64_t
%tmp2 = bitcast %i64_t* %tmp1 to i32*
%useless3 = bitcast %i64_t* %tmp1 to i16*
%useless4 = getelementptr inbounds i16, i16* %useless3, i16 undef
%useless5 = bitcast i16* %useless4 to i32*
br i1 undef, label %bb1, label %bb2
bb1: ; preds = %bb0
%useless6 = insertvalue [1 x i32*] undef, i32* %tmp2, 0
%useless7 = insertvalue [1 x i32*] %useless6, i32* null, 0
%tmp8 = ptrtoint i32* %tmp2 to i16
store i16 %tmp8, i16* @a
unreachable
bb2: ; preds = %bb0
%tmp9 = load i16*, i16** @b
store i16 0, i16* %tmp9
%tmp10 = load i32, i32* %tmp2
%tmp11 = sub i32 %tmp10, 1
store i32 %tmp11, i32* %tmp2
ret void
}