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