51 lines
1.3 KiB
LLVM
51 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define void @hang_2002-03-11(i32 %X) {
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; CHECK-LABEL: @hang_2002-03-11(
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; CHECK-NEXT: ret void
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;
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%reg117 = add i32 %X, 0
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ret void
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}
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; Instcombine was missing a test that caused it to make illegal transformations
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; sometimes. In this case, it transformed the sub into an add:
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define i32 @sub_failure_2002-05-14(i32 %i, i32 %j) {
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; CHECK-LABEL: @sub_failure_2002-05-14(
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; CHECK-NEXT: [[A:%.*]] = mul i32 %i, %j
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; CHECK-NEXT: [[B:%.*]] = sub i32 2, [[A]]
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; CHECK-NEXT: ret i32 [[B]]
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;
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%A = mul i32 %i, %j
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%B = sub i32 2, %A
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ret i32 %B
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}
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; This testcase was incorrectly getting completely eliminated. There should be
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; SOME instruction named %c here, even if it's a bitwise and.
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define i64 @cast_test_2002-08-02(i64 %A) {
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; CHECK-LABEL: @cast_test_2002-08-02(
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; CHECK-NEXT: [[C2:%.*]] = and i64 %A, 255
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; CHECK-NEXT: ret i64 [[C2]]
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;
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%c1 = trunc i64 %A to i8
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%c2 = zext i8 %c1 to i64
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ret i64 %c2
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}
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define i32 @missed_const_prop_2002-12-05(i32 %A) {
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; CHECK-LABEL: @missed_const_prop_2002-12-05(
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; CHECK-NEXT: ret i32 0
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;
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%A.neg = sub i32 0, %A
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%.neg = sub i32 0, 1
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%X = add i32 %.neg, 1
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%Y.neg.ra = add i32 %A, %X
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%r = add i32 %A.neg, %Y.neg.ra
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ret i32 %r
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}
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