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[NFC][InstCombine] Tests for x - ~(y) -> x + y + 1 fold (PR42457) 

https://bugs.llvm.org/show_bug.cgi?id=42457
https://rise4fun.com/Alive/iFhE

llvm-svn: 364739
This commit is contained in:
Roman Lebedev 2019-07-01 09:57:53 +00:00
parent f55818e3a7
commit 4f878fe3a7
1 changed files with 94 additions and 0 deletions
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llvm/test/Transforms/InstCombine/fold-sub-of-not-to-inc-of-add.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -instcombine -S < %s | FileCheck %s
; Given:
; sub %y, (xor %x, -1)
; Transform it to:
; add (add %x, %y), 1
;------------------------------------------------------------------------------;
; Scalar tests
;------------------------------------------------------------------------------;
define i32 @p0_scalar(i32 %x, i32 %y) {
; CHECK-LABEL: @p0_scalar(
; CHECK-NEXT: [[T0:%.*]] = xor i32 [[X:%.*]], -1
; CHECK-NEXT: [[T1:%.*]] = sub i32 [[Y:%.*]], [[T0]]
; CHECK-NEXT: ret i32 [[T1]]
;
%t0 = xor i32 %x, -1
%t1 = sub i32 %y, %t0
ret i32 %t1
}
;------------------------------------------------------------------------------;
; Vector tests
;------------------------------------------------------------------------------;
define <4 x i32> @p1_vector_splat(<4 x i32> %x, <4 x i32> %y) {
; CHECK-LABEL: @p1_vector_splat(
; CHECK-NEXT: [[T0:%.*]] = xor <4 x i32> [[X:%.*]], <i32 -1, i32 -1, i32 -1, i32 -1>
; CHECK-NEXT: [[T1:%.*]] = sub <4 x i32> [[Y:%.*]], [[T0]]
; CHECK-NEXT: ret <4 x i32> [[T1]]
;
%t0 = xor <4 x i32> %x, <i32 -1, i32 -1, i32 -1, i32 -1>
%t1 = sub <4 x i32> %y, %t0
ret <4 x i32> %t1
}
define <4 x i32> @p2_vector_undef(<4 x i32> %x, <4 x i32> %y) {
; CHECK-LABEL: @p2_vector_undef(
; CHECK-NEXT: [[T0:%.*]] = xor <4 x i32> [[X:%.*]], <i32 -1, i32 -1, i32 undef, i32 -1>
; CHECK-NEXT: [[T1:%.*]] = sub <4 x i32> [[Y:%.*]], [[T0]]
; CHECK-NEXT: ret <4 x i32> [[T1]]
;
%t0 = xor <4 x i32> %x, <i32 -1, i32 -1, i32 undef, i32 -1>
%t1 = sub <4 x i32> %y, %t0
ret <4 x i32> %t1
}
;------------------------------------------------------------------------------;
; One-use test
;------------------------------------------------------------------------------;
declare void @use32(i32)
define i32 @p3_oneuse(i32 %x, i32 %y) {
; CHECK-LABEL: @p3_oneuse(
; CHECK-NEXT: [[T0:%.*]] = xor i32 [[X:%.*]], -1
; CHECK-NEXT: call void @use32(i32 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = sub i32 [[Y:%.*]], [[T0]]
; CHECK-NEXT: ret i32 [[T1]]
;
%t0 = xor i32 %x, -1
call void @use32(i32 %t0)
%t1 = sub i32 %y, %t0
ret i32 %t1
}
;------------------------------------------------------------------------------;
; Basic negative tests
;------------------------------------------------------------------------------;
; The `sub` (and the fold) is not commutative.
define i32 @n4(i32 %x, i32 %y) {
; CHECK-LABEL: @n4(
; CHECK-NEXT: [[T0:%.*]] = xor i32 [[X:%.*]], -1
; CHECK-NEXT: [[T1:%.*]] = sub i32 [[T0]], [[Y:%.*]]
; CHECK-NEXT: ret i32 [[T1]]
;
%t0 = xor i32 %x, -1
%t1 = sub i32 %t0, %y ; swapped
ret i32 %t1
}
define i32 @n5_is_not_not(i32 %x, i32 %y) {
; CHECK-LABEL: @n5_is_not_not(
; CHECK-NEXT: [[T0:%.*]] = xor i32 [[X:%.*]], 2147483647
; CHECK-NEXT: [[T1:%.*]] = sub i32 [[Y:%.*]], [[T0]]
; CHECK-NEXT: ret i32 [[T1]]
;
%t0 = xor i32 %x, 2147483647 ; not -1
%t1 = sub i32 %y, %t0
ret i32 %t1
}