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[NFC][InstCombine] '(Op1 & С) - Op1' pattern tests (PR44427)

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Roman Lebedev 2020-01-03 21:05:34 +03:00
parent 9b750cc6ba
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llvm/test/Transforms/InstCombine/hoist-negation-out-of-bias-calculation-with-constant.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S < %s -instcombine | FileCheck %s
; Fold
; (X & C) - X
; to
; - (X & ~C)
;
; This allows us to possibly hoist said negation further out,
; and decreases use count of X.
; https://bugs.llvm.org/show_bug.cgi?id=44427
; Base tests
define i8 @t0(i8 %x) {
; CHECK-LABEL: @t0(
; CHECK-NEXT: [[UNBIASEDX:%.*]] = and i8 [[X:%.*]], 42
; CHECK-NEXT: [[NEGBIAS:%.*]] = sub i8 [[UNBIASEDX]], [[X]]
; CHECK-NEXT: ret i8 [[NEGBIAS]]
;
%unbiasedx = and i8 %x, 42
%negbias = sub i8 %unbiasedx, %x
ret i8 %negbias
}
define <2 x i8> @t1_vec(<2 x i8> %x) {
; CHECK-LABEL: @t1_vec(
; CHECK-NEXT: [[UNBIASEDX:%.*]] = and <2 x i8> [[X:%.*]], <i8 42, i8 42>
; CHECK-NEXT: [[NEGBIAS:%.*]] = sub <2 x i8> [[UNBIASEDX]], [[X]]
; CHECK-NEXT: ret <2 x i8> [[NEGBIAS]]
;
%unbiasedx = and <2 x i8> %x, <i8 42, i8 42>
%negbias = sub <2 x i8> %unbiasedx, %x
ret <2 x i8> %negbias
}
define <2 x i8> @t2_vec_undef(<2 x i8> %x) {
; CHECK-LABEL: @t2_vec_undef(
; CHECK-NEXT: [[UNBIASEDX:%.*]] = and <2 x i8> [[X:%.*]], <i8 42, i8 undef>
; CHECK-NEXT: [[NEGBIAS:%.*]] = sub <2 x i8> [[UNBIASEDX]], [[X]]
; CHECK-NEXT: ret <2 x i8> [[NEGBIAS]]
;
%unbiasedx = and <2 x i8> %x, <i8 42, i8 undef>
%negbias = sub <2 x i8> %unbiasedx, %x
ret <2 x i8> %negbias
}
define <2 x i8> @t3_vec_nonsplat(<2 x i8> %x) {
; CHECK-LABEL: @t3_vec_nonsplat(
; CHECK-NEXT: [[UNBIASEDX:%.*]] = and <2 x i8> [[X:%.*]], <i8 42, i8 44>
; CHECK-NEXT: [[NEGBIAS:%.*]] = sub <2 x i8> [[UNBIASEDX]], [[X]]
; CHECK-NEXT: ret <2 x i8> [[NEGBIAS]]
;
%unbiasedx = and <2 x i8> %x, <i8 42, i8 44>
%negbias = sub <2 x i8> %unbiasedx, %x
ret <2 x i8> %negbias
}
; Extra uses always prevent fold
declare void @use8(i8)
define i8 @n4_extrause(i8 %x) {
; CHECK-LABEL: @n4_extrause(
; CHECK-NEXT: [[UNBIASEDX:%.*]] = and i8 [[X:%.*]], 42
; CHECK-NEXT: call void @use8(i8 [[UNBIASEDX]])
; CHECK-NEXT: [[NEGBIAS:%.*]] = sub i8 [[UNBIASEDX]], [[X]]
; CHECK-NEXT: ret i8 [[NEGBIAS]]
;
%unbiasedx = and i8 %x, 42
call void @use8(i8 %unbiasedx)
%negbias = sub i8 %unbiasedx, %x
ret i8 %negbias
}
; Negative tests
define i8 @n5(i8 %x) {
; CHECK-LABEL: @n5(
; CHECK-NEXT: [[NEGBIAS:%.*]] = and i8 [[X:%.*]], -43
; CHECK-NEXT: ret i8 [[NEGBIAS]]
;
%unbiasedx = and i8 %x, 42
%negbias = sub i8 %x, %unbiasedx ; wrong order
ret i8 %negbias
}
define i8 @n6(i8 %x0, i8 %x1) {
; CHECK-LABEL: @n6(
; CHECK-NEXT: [[UNBIASEDX:%.*]] = and i8 [[X1:%.*]], 42
; CHECK-NEXT: [[NEGBIAS:%.*]] = sub i8 [[UNBIASEDX]], [[X0:%.*]]
; CHECK-NEXT: ret i8 [[NEGBIAS]]
;
%unbiasedx = and i8 %x1, 42 ; not %x0
%negbias = sub i8 %unbiasedx, %x0 ; not %x1
ret i8 %negbias
}