derek.holloway
7502bf64a4
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69 lines
2.0 KiB
LLVM
69 lines
2.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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; Transform
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; (~x) a>> y
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; into:
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; ~(x a>> y)
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declare void @use8(i8)
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; Most basic positive test
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define i8 @t0(i8 %x, i8 %y) {
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; CHECK-LABEL: @t0(
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; CHECK-NEXT: [[NOT_X_NOT:%.*]] = ashr i8 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[ASHR:%.*]] = xor i8 [[NOT_X_NOT]], -1
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; CHECK-NEXT: ret i8 [[ASHR]]
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;
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%not_x = xor i8 %x, -1
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%ashr = ashr i8 %not_x, %y
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ret i8 %ashr
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}
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; 'exact'-ness isn't preserved!
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define i8 @t1(i8 %x, i8 %y) {
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; CHECK-LABEL: @t1(
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; CHECK-NEXT: [[NOT_X_NOT:%.*]] = ashr i8 [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[ASHR:%.*]] = xor i8 [[NOT_X_NOT]], -1
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; CHECK-NEXT: ret i8 [[ASHR]]
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;
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%not_x = xor i8 %x, -1
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%ashr = ashr exact i8 %not_x, %y
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ret i8 %ashr
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}
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; Basic vector test
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define <2 x i8> @t2_vec(<2 x i8> %x, <2 x i8> %y) {
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; CHECK-LABEL: @t2_vec(
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; CHECK-NEXT: [[NOT_X_NOT:%.*]] = ashr <2 x i8> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[ASHR:%.*]] = xor <2 x i8> [[NOT_X_NOT]], splat (i8 -1)
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; CHECK-NEXT: ret <2 x i8> [[ASHR]]
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;
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%not_x = xor <2 x i8> %x, <i8 -1, i8 -1>
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%ashr = ashr <2 x i8> %not_x, %y
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ret <2 x i8> %ashr
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}
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; Note that we must sanitize poison elts of -1 constant to -1 or 0.
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define <2 x i8> @t3_vec_poison(<2 x i8> %x, <2 x i8> %y) {
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; CHECK-LABEL: @t3_vec_poison(
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; CHECK-NEXT: [[NOT_X_NOT:%.*]] = ashr <2 x i8> [[X:%.*]], [[Y:%.*]]
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; CHECK-NEXT: [[ASHR:%.*]] = xor <2 x i8> [[NOT_X_NOT]], splat (i8 -1)
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; CHECK-NEXT: ret <2 x i8> [[ASHR]]
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;
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%not_x = xor <2 x i8> %x, <i8 -1, i8 poison>
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%ashr = ashr <2 x i8> %not_x, %y
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ret <2 x i8> %ashr
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}
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; Extra use prevents the fold.
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define i8 @n4(i8 %x, i8 %y) {
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; CHECK-LABEL: @n4(
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; CHECK-NEXT: [[NOT_X:%.*]] = xor i8 [[X:%.*]], -1
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; CHECK-NEXT: call void @use8(i8 [[NOT_X]])
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; CHECK-NEXT: [[ASHR:%.*]] = ashr i8 [[NOT_X]], [[Y:%.*]]
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; CHECK-NEXT: ret i8 [[ASHR]]
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;
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%not_x = xor i8 %x, -1
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call void @use8(i8 %not_x)
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%ashr = ashr i8 %not_x, %y
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ret i8 %ashr
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}
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