42 lines
1.4 KiB
LLVM
42 lines
1.4 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -nary-reassociate -S | FileCheck %s
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; RUN: opt < %s -passes='nary-reassociate' -S | FileCheck %s
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define i32 @foo(i32 %t4) {
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; CHECK-LABEL: @foo(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[T13:%.*]] = add i32 [[T4:%.*]], -128
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; CHECK-NEXT: [[T14:%.*]] = add i32 [[T13]], 8
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; CHECK-NEXT: [[T23:%.*]] = add i32 [[T13]], 119
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; CHECK-NEXT: ret i32 [[T23]]
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;
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entry:
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%t5 = add i32 %t4, 8
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%t13 = add i32 %t4, -128 ; deleted
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%t14 = add i32 %t13, 8 ; => %t5 + -128
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%t21 = add i32 119, %t4
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; do not rewrite %t23 against %t13 because %t13 is already deleted
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%t23 = add i32 %t21, -128
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ret i32 %t23
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}
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; This is essentially the same test as the previous one but intermidiate result (t14) has a use.
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define i32 @foo2(i32 %t4) {
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; CHECK-LABEL: @foo2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[T13:%.*]] = add i32 [[T4:%.*]], -128
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; CHECK-NEXT: [[T14:%.*]] = add i32 [[T13]], 8
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; CHECK-NEXT: [[T23:%.*]] = add i32 [[T13]], 119
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; CHECK-NEXT: [[RES:%.*]] = add i32 [[T14]], [[T23]]
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; CHECK-NEXT: ret i32 [[RES]]
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;
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entry:
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%t5 = add i32 %t4, 8 ; initially dead
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%t13 = add i32 %t4, -128
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%t14 = add i32 %t13, 8
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%t21 = add i32 119, %t4 ; => dead after reassociation
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%t23 = add i32 %t21, -128; => reassociated to t13 + 119
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%res = add i32 %t14, %t23
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ret i32 %res
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}
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