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Add tests for transforming (max/min (xor X, Pow2), X); NFC
Differential Revision: https://reviews.llvm.org/D144605
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‎llvm/test/Transforms/InstCombine/minmax-of-xor-x.ll

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; 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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declare i8 @llvm.smin.i8(i8, i8)
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declare i8 @llvm.umin.i8(i8, i8)
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declare i8 @llvm.smax.i8(i8, i8)
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declare i8 @llvm.umax.i8(i8, i8)
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declare <2 x i8> @llvm.smin.v2i8(<2 x i8>, <2 x i8>)
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declare <2 x i8> @llvm.umin.v2i8(<2 x i8>, <2 x i8>)
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declare <2 x i8> @llvm.smax.v2i8(<2 x i8>, <2 x i8>)
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declare <2 x i8> @llvm.umax.v2i8(<2 x i8>, <2 x i8>)
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declare void @llvm.assume(i1)
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declare void @barrier()
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define <2 x i8> @umax_xor_Cpow2(<2 x i8> %x) {
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; CHECK-LABEL: @umax_xor_Cpow2(
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; CHECK-NEXT: [[X_XOR:%.*]] = xor <2 x i8> [[X:%.*]], <i8 -128, i8 -128>
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; CHECK-NEXT: [[R:%.*]] = call <2 x i8> @llvm.umax.v2i8(<2 x i8> [[X]], <2 x i8> [[X_XOR]])
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; CHECK-NEXT: ret <2 x i8> [[R]]
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;
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%x_xor = xor <2 x i8> %x, <i8 128, i8 128>
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%r = call <2 x i8> @llvm.umax.v2i8(<2 x i8> %x, <2 x i8> %x_xor)
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ret <2 x i8> %r
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}
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define i8 @umin_xor_Cpow2(i8 %x) {
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; CHECK-LABEL: @umin_xor_Cpow2(
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; CHECK-NEXT: [[X_XOR:%.*]] = xor i8 [[X:%.*]], 64
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.umin.i8(i8 [[X]], i8 [[X_XOR]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_xor = xor i8 %x, 64
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%r = call i8 @llvm.umin.i8(i8 %x, i8 %x_xor)
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ret i8 %r
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}
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define i8 @smax_xor_Cpow2_pos(i8 %x) {
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; CHECK-LABEL: @smax_xor_Cpow2_pos(
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; CHECK-NEXT: [[X_XOR:%.*]] = xor i8 [[X:%.*]], 32
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.smax.i8(i8 [[X]], i8 [[X_XOR]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_xor = xor i8 %x, 32
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%r = call i8 @llvm.smax.i8(i8 %x, i8 %x_xor)
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ret i8 %r
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}
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define <2 x i8> @smin_xor_Cpow2_pos(<2 x i8> %x) {
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; CHECK-LABEL: @smin_xor_Cpow2_pos(
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; CHECK-NEXT: [[X_XOR:%.*]] = xor <2 x i8> [[X:%.*]], <i8 16, i8 16>
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; CHECK-NEXT: [[R:%.*]] = call <2 x i8> @llvm.smin.v2i8(<2 x i8> [[X]], <2 x i8> [[X_XOR]])
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; CHECK-NEXT: ret <2 x i8> [[R]]
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;
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%x_xor = xor <2 x i8> %x, <i8 16, i8 16>
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%r = call <2 x i8> @llvm.smin.v2i8(<2 x i8> %x, <2 x i8> %x_xor)
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ret <2 x i8> %r
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}
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define <2 x i8> @smax_xor_Cpow2_neg(<2 x i8> %x) {
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; CHECK-LABEL: @smax_xor_Cpow2_neg(
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; CHECK-NEXT: [[X_XOR:%.*]] = xor <2 x i8> [[X:%.*]], <i8 -128, i8 -128>
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; CHECK-NEXT: [[R:%.*]] = call <2 x i8> @llvm.smax.v2i8(<2 x i8> [[X]], <2 x i8> [[X_XOR]])
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; CHECK-NEXT: ret <2 x i8> [[R]]
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;
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%x_xor = xor <2 x i8> %x, <i8 128, i8 128>
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%r = call <2 x i8> @llvm.smax.v2i8(<2 x i8> %x, <2 x i8> %x_xor)
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ret <2 x i8> %r
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}
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define i8 @smin_xor_Cpow2_neg(i8 %x) {
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; CHECK-LABEL: @smin_xor_Cpow2_neg(
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; CHECK-NEXT: [[X_XOR:%.*]] = xor i8 [[X:%.*]], -128
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.smin.i8(i8 [[X]], i8 [[X_XOR]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_xor = xor i8 %x, 128
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%r = call i8 @llvm.smin.i8(i8 %x, i8 %x_xor)
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ret i8 %r
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}
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define i8 @umax_xor_pow2(i8 %x, i8 %y) {
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; CHECK-LABEL: @umax_xor_pow2(
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; CHECK-NEXT: [[NY:%.*]] = sub i8 0, [[Y:%.*]]
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; CHECK-NEXT: [[YP2:%.*]] = and i8 [[NY]], [[Y]]
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; CHECK-NEXT: [[X_XOR:%.*]] = xor i8 [[YP2]], [[X:%.*]]
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.umax.i8(i8 [[X]], i8 [[X_XOR]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%ny = sub i8 0, %y
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%yp2 = and i8 %y, %ny
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%x_xor = xor i8 %x, %yp2
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%r = call i8 @llvm.umax.i8(i8 %x, i8 %x_xor)
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ret i8 %r
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}
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define <2 x i8> @umin_xor_pow2(<2 x i8> %x, <2 x i8> %y) {
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; CHECK-LABEL: @umin_xor_pow2(
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; CHECK-NEXT: [[NY:%.*]] = sub <2 x i8> zeroinitializer, [[Y:%.*]]
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; CHECK-NEXT: [[YP2:%.*]] = and <2 x i8> [[NY]], [[Y]]
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; CHECK-NEXT: [[X_XOR:%.*]] = xor <2 x i8> [[YP2]], [[X:%.*]]
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; CHECK-NEXT: [[R:%.*]] = call <2 x i8> @llvm.umin.v2i8(<2 x i8> [[X]], <2 x i8> [[X_XOR]])
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; CHECK-NEXT: ret <2 x i8> [[R]]
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;
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%ny = sub <2 x i8> <i8 0, i8 0>, %y
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%yp2 = and <2 x i8> %y, %ny
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%x_xor = xor <2 x i8> %x, %yp2
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%r = call <2 x i8> @llvm.umin.v2i8(<2 x i8> %x, <2 x i8> %x_xor)
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ret <2 x i8> %r
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}
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define i8 @smax_xor_pow2_unk(i8 %x, i8 %y) {
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; CHECK-LABEL: @smax_xor_pow2_unk(
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; CHECK-NEXT: [[NY:%.*]] = sub i8 0, [[Y:%.*]]
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; CHECK-NEXT: [[YP2:%.*]] = and i8 [[NY]], [[Y]]
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; CHECK-NEXT: [[X_XOR:%.*]] = xor i8 [[YP2]], [[X:%.*]]
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.smax.i8(i8 [[X]], i8 [[X_XOR]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%ny = sub i8 0, %y
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%yp2 = and i8 %y, %ny
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%x_xor = xor i8 %x, %yp2
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%r = call i8 @llvm.smax.i8(i8 %x, i8 %x_xor)
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ret i8 %r
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}
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define <2 x i8> @smin_xor_pow2_unk(<2 x i8> %x, <2 x i8> %y) {
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; CHECK-LABEL: @smin_xor_pow2_unk(
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; CHECK-NEXT: [[NY:%.*]] = sub <2 x i8> zeroinitializer, [[Y:%.*]]
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; CHECK-NEXT: [[YP2:%.*]] = and <2 x i8> [[NY]], [[Y]]
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; CHECK-NEXT: [[X_XOR:%.*]] = xor <2 x i8> [[YP2]], [[X:%.*]]
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; CHECK-NEXT: [[R:%.*]] = call <2 x i8> @llvm.smin.v2i8(<2 x i8> [[X]], <2 x i8> [[X_XOR]])
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; CHECK-NEXT: ret <2 x i8> [[R]]
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;
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%ny = sub <2 x i8> <i8 0, i8 0>, %y
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%yp2 = and <2 x i8> %y, %ny
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%x_xor = xor <2 x i8> %x, %yp2
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%r = call <2 x i8> @llvm.smin.v2i8(<2 x i8> %x, <2 x i8> %x_xor)
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ret <2 x i8> %r
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}
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define i8 @smax_xor_pow2_neg(i8 %x, i8 %y) {
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; CHECK-LABEL: @smax_xor_pow2_neg(
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; CHECK-NEXT: [[NY:%.*]] = sub i8 0, [[Y:%.*]]
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; CHECK-NEXT: [[YP2:%.*]] = and i8 [[NY]], [[Y]]
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[YP2]], 0
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; CHECK-NEXT: br i1 [[CMP]], label [[NEG:%.*]], label [[POS:%.*]]
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; CHECK: neg:
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; CHECK-NEXT: [[X_XOR:%.*]] = xor i8 [[YP2]], [[X:%.*]]
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.smax.i8(i8 [[X]], i8 [[X_XOR]])
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; CHECK-NEXT: ret i8 [[R]]
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; CHECK: pos:
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; CHECK-NEXT: call void @barrier()
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; CHECK-NEXT: ret i8 0
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;
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%ny = sub i8 0, %y
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%yp2 = and i8 %y, %ny
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%cmp = icmp slt i8 %yp2, 0
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br i1 %cmp, label %neg, label %pos
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neg:
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%x_xor = xor i8 %x, %yp2
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%r = call i8 @llvm.smax.i8(i8 %x, i8 %x_xor)
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ret i8 %r
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pos:
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call void @barrier()
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ret i8 0
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}
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define i8 @smin_xor_pow2_pos(i8 %x, i8 %y) {
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; CHECK-LABEL: @smin_xor_pow2_pos(
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; CHECK-NEXT: [[NY:%.*]] = sub i8 0, [[Y:%.*]]
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; CHECK-NEXT: [[YP2:%.*]] = and i8 [[NY]], [[Y]]
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; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i8 [[YP2]], 0
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; CHECK-NEXT: br i1 [[CMP]], label [[NEG:%.*]], label [[POS:%.*]]
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; CHECK: neg:
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; CHECK-NEXT: [[X_XOR:%.*]] = xor i8 [[YP2]], [[X:%.*]]
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.smin.i8(i8 [[X]], i8 [[X_XOR]])
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; CHECK-NEXT: ret i8 [[R]]
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; CHECK: pos:
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; CHECK-NEXT: call void @barrier()
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; CHECK-NEXT: ret i8 0
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;
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%ny = sub i8 0, %y
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%yp2 = and i8 %y, %ny
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%cmp = icmp sgt i8 %yp2, 0
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br i1 %cmp, label %neg, label %pos
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neg:
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%x_xor = xor i8 %x, %yp2
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%r = call i8 @llvm.smin.i8(i8 %x, i8 %x_xor)
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ret i8 %r
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pos:
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call void @barrier()
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ret i8 0
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}

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