sdiv-exact-by-power-of-two.ll
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; 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
}