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[InstCombine] Add tests for folding (op x, ({z,s}ext (icmp eq x, C))); NFC
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‎llvm/test/Transforms/InstCombine/fold-ext-eq-c-with-op.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 void @use.i8(i8)
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define i8 @fold_add_zext_eq_0(i8 %x) {
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; CHECK-LABEL: @fold_add_zext_eq_0(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 0
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; CHECK-NEXT: [[X_EQ_EXT:%.*]] = zext i1 [[X_EQ]] to i8
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; CHECK-NEXT: [[R:%.*]] = add i8 [[X_EQ_EXT]], [[X]]
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_eq = icmp eq i8 %x, 0
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%x_eq_ext = zext i1 %x_eq to i8
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%r = add i8 %x, %x_eq_ext
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ret i8 %r
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}
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define i8 @fold_add_sext_eq_0(i8 %x) {
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; CHECK-LABEL: @fold_add_sext_eq_0(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 0
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; CHECK-NEXT: [[X_EQ_EXT:%.*]] = sext i1 [[X_EQ]] to i8
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; CHECK-NEXT: [[R:%.*]] = add i8 [[X_EQ_EXT]], [[X]]
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_eq = icmp eq i8 %x, 0
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%x_eq_ext = sext i1 %x_eq to i8
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%r = add i8 %x, %x_eq_ext
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ret i8 %r
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}
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define i8 @fold_add_zext_eq_0_fail_multiuse_exp(i8 %x) {
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; CHECK-LABEL: @fold_add_zext_eq_0_fail_multiuse_exp(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 0
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; CHECK-NEXT: [[X_EQ_EXT:%.*]] = zext i1 [[X_EQ]] to i8
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; CHECK-NEXT: [[R:%.*]] = add i8 [[X_EQ_EXT]], [[X]]
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; CHECK-NEXT: call void @use.i8(i8 [[X_EQ_EXT]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_eq = icmp eq i8 %x, 0
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%x_eq_ext = zext i1 %x_eq to i8
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%r = add i8 %x, %x_eq_ext
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call void @use.i8(i8 %x_eq_ext)
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ret i8 %r
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}
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define i8 @fold_mul_sext_eq_12(i8 %x) {
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; CHECK-LABEL: @fold_mul_sext_eq_12(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 12
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; CHECK-NEXT: [[R:%.*]] = select i1 [[X_EQ]], i8 -12, i8 0
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_eq = icmp eq i8 %x, 12
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%x_eq_ext = sext i1 %x_eq to i8
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%r = mul i8 %x, %x_eq_ext
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ret i8 %r
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}
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define i8 @fold_mul_sext_eq_12_fail_multiuse(i8 %x) {
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; CHECK-LABEL: @fold_mul_sext_eq_12_fail_multiuse(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 12
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; CHECK-NEXT: [[X_EQ_EXT:%.*]] = sext i1 [[X_EQ]] to i8
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; CHECK-NEXT: [[R:%.*]] = mul i8 [[X_EQ_EXT]], [[X]]
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; CHECK-NEXT: call void @use.i8(i8 [[X_EQ_EXT]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_eq = icmp eq i8 %x, 12
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%x_eq_ext = sext i1 %x_eq to i8
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%r = mul i8 %x, %x_eq_ext
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call void @use.i8(i8 %x_eq_ext)
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ret i8 %r
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}
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define i8 @fold_shl_zext_eq_3_rhs(i8 %x) {
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; CHECK-LABEL: @fold_shl_zext_eq_3_rhs(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 3
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; CHECK-NEXT: [[X_EQ_EXT:%.*]] = zext i1 [[X_EQ]] to i8
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; CHECK-NEXT: [[R:%.*]] = shl i8 [[X]], [[X_EQ_EXT]]
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_eq = icmp eq i8 %x, 3
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%x_eq_ext = zext i1 %x_eq to i8
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%r = shl i8 %x, %x_eq_ext
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ret i8 %r
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}
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define i8 @fold_shl_zext_eq_3_lhs(i8 %x) {
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; CHECK-LABEL: @fold_shl_zext_eq_3_lhs(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 3
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; CHECK-NEXT: [[X_EQ_EXT:%.*]] = zext i1 [[X_EQ]] to i8
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; CHECK-NEXT: [[R:%.*]] = shl nuw i8 [[X_EQ_EXT]], [[X]]
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_eq = icmp eq i8 %x, 3
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%x_eq_ext = zext i1 %x_eq to i8
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%r = shl i8 %x_eq_ext, %x
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ret i8 %r
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}
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define <2 x i8> @fold_lshr_sext_eq_15_5_lhs(<2 x i8> %x) {
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; CHECK-LABEL: @fold_lshr_sext_eq_15_5_lhs(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq <2 x i8> [[X:%.*]], <i8 15, i8 5>
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; CHECK-NEXT: [[X_EQ_EXT:%.*]] = sext <2 x i1> [[X_EQ]] to <2 x i8>
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; CHECK-NEXT: [[R:%.*]] = lshr <2 x i8> [[X_EQ_EXT]], [[X]]
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; CHECK-NEXT: ret <2 x i8> [[R]]
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;
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%x_eq = icmp eq <2 x i8> %x, <i8 15, i8 5>
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%x_eq_ext = sext <2 x i1> %x_eq to <2 x i8>
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%r = lshr <2 x i8> %x_eq_ext, %x
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ret <2 x i8> %r
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}
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define <2 x i8> @fold_lshr_sext_eq_15_poison_rhs(<2 x i8> %x) {
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; CHECK-LABEL: @fold_lshr_sext_eq_15_poison_rhs(
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; CHECK-NEXT: ret <2 x i8> [[X:%.*]]
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;
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%x_eq = icmp eq <2 x i8> %x, <i8 15, i8 poison>
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%x_eq_ext = sext <2 x i1> %x_eq to <2 x i8>
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%r = lshr <2 x i8> %x, %x_eq_ext
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ret <2 x i8> %r
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}
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define i8 @fold_umax_zext_eq_9(i8 %x) {
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; CHECK-LABEL: @fold_umax_zext_eq_9(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 9
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; CHECK-NEXT: [[X_EQ_EXT:%.*]] = sext i1 [[X_EQ]] to i8
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.umax.i8(i8 [[X]], i8 [[X_EQ_EXT]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_eq = icmp eq i8 %x, 9
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%x_eq_ext = sext i1 %x_eq to i8
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%r = call i8 @llvm.umax.i8(i8 %x, i8 %x_eq_ext)
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ret i8 %r
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}
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define i8 @fold_sshl_sat_sext_eq_3_rhs(i8 %x) {
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; CHECK-LABEL: @fold_sshl_sat_sext_eq_3_rhs(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 3
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; CHECK-NEXT: [[X_EQ_EXT:%.*]] = sext i1 [[X_EQ]] to i8
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.sshl.sat.i8(i8 [[X]], i8 [[X_EQ_EXT]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_eq = icmp eq i8 %x, 3
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%x_eq_ext = sext i1 %x_eq to i8
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%r = call i8 @llvm.sshl.sat.i8(i8 %x, i8 %x_eq_ext)
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ret i8 %r
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}
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define i8 @fold_ushl_sat_zext_eq_3_lhs(i8 %x) {
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; CHECK-LABEL: @fold_ushl_sat_zext_eq_3_lhs(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 3
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; CHECK-NEXT: [[X_EQ_EXT:%.*]] = zext i1 [[X_EQ]] to i8
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.ushl.sat.i8(i8 [[X_EQ_EXT]], i8 [[X]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_eq = icmp eq i8 %x, 3
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%x_eq_ext = zext i1 %x_eq to i8
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%r = call i8 @llvm.ushl.sat.i8(i8 %x_eq_ext, i8 %x)
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ret i8 %r
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}
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define i8 @fold_uadd_sat_zext_eq_3_rhs(i8 %x) {
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; CHECK-LABEL: @fold_uadd_sat_zext_eq_3_rhs(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 3
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; CHECK-NEXT: [[X_EQ_EXT:%.*]] = zext i1 [[X_EQ]] to i8
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.uadd.sat.i8(i8 [[X]], i8 [[X_EQ_EXT]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_eq = icmp eq i8 %x, 3
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%x_eq_ext = zext i1 %x_eq to i8
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%r = call i8 @llvm.uadd.sat.i8(i8 %x, i8 %x_eq_ext)
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ret i8 %r
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}
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define i8 @fold_ssub_sat_sext_eq_99_lhs_fail(i8 %x) {
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; CHECK-LABEL: @fold_ssub_sat_sext_eq_99_lhs_fail(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 99
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; CHECK-NEXT: [[X_EQ_EXT:%.*]] = sext i1 [[X_EQ]] to i8
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[X_EQ_EXT]], i8 [[X]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_eq = icmp eq i8 %x, 99
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%x_eq_ext = sext i1 %x_eq to i8
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%r = call i8 @llvm.ssub.sat.i8(i8 %x_eq_ext, i8 %x)
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ret i8 %r
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}
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define i8 @fold_ssub_sat_zext_eq_99_rhs(i8 %x) {
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; CHECK-LABEL: @fold_ssub_sat_zext_eq_99_rhs(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[X:%.*]], 99
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; CHECK-NEXT: [[X_EQ_EXT:%.*]] = zext i1 [[X_EQ]] to i8
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; CHECK-NEXT: [[R:%.*]] = call i8 @llvm.ssub.sat.i8(i8 [[X]], i8 [[X_EQ_EXT]])
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; CHECK-NEXT: ret i8 [[R]]
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;
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%x_eq = icmp eq i8 %x, 99
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%x_eq_ext = zext i1 %x_eq to i8
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%r = call i8 @llvm.ssub.sat.i8(i8 %x, i8 %x_eq_ext)
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ret i8 %r
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}

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