forked from OSchip/llvm-project
69 lines
1.8 KiB
LLVM
69 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt %s -instcombine -S | FileCheck %s
|
|
|
|
; Fold
|
|
; x s/EXACT (1 << y)
|
|
; to
|
|
; x a>>EXACT y
|
|
; iff 1<<y is non-negative
|
|
|
|
define i8 @t0(i8 %x) {
|
|
; CHECK-LABEL: @t0(
|
|
; CHECK-NEXT: [[DIV:%.*]] = ashr exact i8 [[X:%.*]], 5
|
|
; CHECK-NEXT: ret i8 [[DIV]]
|
|
;
|
|
%div = sdiv exact i8 %x, 32
|
|
ret i8 %div
|
|
}
|
|
define i8 @n1(i8 %x) {
|
|
; CHECK-LABEL: @n1(
|
|
; CHECK-NEXT: [[DIV:%.*]] = sdiv i8 [[X:%.*]], 32
|
|
; CHECK-NEXT: ret i8 [[DIV]]
|
|
;
|
|
%div = sdiv i8 %x, 32 ; not exact
|
|
ret i8 %div
|
|
}
|
|
define i8 @n2(i8 %x) {
|
|
; CHECK-LABEL: @n2(
|
|
; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i8 [[X:%.*]], -128
|
|
; CHECK-NEXT: [[DIV:%.*]] = zext i1 [[TMP1]] to i8
|
|
; CHECK-NEXT: ret i8 [[DIV]]
|
|
;
|
|
%div = sdiv i8 %x, 128 ; negative divisor
|
|
ret i8 %div
|
|
}
|
|
|
|
define <2 x i8> @t3_vec_splat(<2 x i8> %x) {
|
|
; CHECK-LABEL: @t3_vec_splat(
|
|
; CHECK-NEXT: [[DIV:%.*]] = ashr exact <2 x i8> [[X:%.*]], <i8 5, i8 5>
|
|
; CHECK-NEXT: ret <2 x i8> [[DIV]]
|
|
;
|
|
%div = sdiv exact <2 x i8> %x, <i8 32, i8 32>
|
|
ret <2 x i8> %div
|
|
}
|
|
|
|
define <2 x i8> @t4_vec(<2 x i8> %x) {
|
|
; CHECK-LABEL: @t4_vec(
|
|
; CHECK-NEXT: [[DIV:%.*]] = ashr exact <2 x i8> [[X:%.*]], <i8 5, i8 4>
|
|
; CHECK-NEXT: ret <2 x i8> [[DIV]]
|
|
;
|
|
%div = sdiv exact <2 x i8> %x, <i8 32, i8 16>
|
|
ret <2 x i8> %div
|
|
}
|
|
|
|
define <2 x i8> @n5_vec_undef(<2 x i8> %x) {
|
|
; CHECK-LABEL: @n5_vec_undef(
|
|
; CHECK-NEXT: ret <2 x i8> undef
|
|
;
|
|
%div = sdiv exact <2 x i8> %x, <i8 32, i8 undef>
|
|
ret <2 x i8> %div
|
|
}
|
|
define <2 x i8> @n6_vec_negative(<2 x i8> %x) {
|
|
; CHECK-LABEL: @n6_vec_negative(
|
|
; CHECK-NEXT: [[DIV:%.*]] = sdiv exact <2 x i8> [[X:%.*]], <i8 32, i8 -128>
|
|
; CHECK-NEXT: ret <2 x i8> [[DIV]]
|
|
;
|
|
%div = sdiv exact <2 x i8> %x, <i8 32, i8 128> ; non-non-negative divisor
|
|
ret <2 x i8> %div
|
|
}
|