forked from OSchip/llvm-project
99 lines
2.7 KiB
LLVM
99 lines
2.7 KiB
LLVM
; 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: [[TMP1:%.*]] = and i8 [[X:%.*]], -43
|
|
; CHECK-NEXT: [[NEGBIAS:%.*]] = sub i8 0, [[TMP1]]
|
|
; 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: [[TMP1:%.*]] = and <2 x i8> [[X:%.*]], <i8 -43, i8 -43>
|
|
; CHECK-NEXT: [[NEGBIAS:%.*]] = sub <2 x i8> zeroinitializer, [[TMP1]]
|
|
; 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: [[TMP1:%.*]] = and <2 x i8> [[X:%.*]], <i8 -43, i8 undef>
|
|
; CHECK-NEXT: [[NEGBIAS:%.*]] = sub <2 x i8> zeroinitializer, [[TMP1]]
|
|
; 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: [[TMP1:%.*]] = and <2 x i8> [[X:%.*]], <i8 -43, i8 -45>
|
|
; CHECK-NEXT: [[NEGBIAS:%.*]] = sub <2 x i8> zeroinitializer, [[TMP1]]
|
|
; 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
|
|
}
|