derek.holloway
7502bf64a4
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59 lines
2.0 KiB
LLVM
59 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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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: [[R:%.*]] = call i8 @llvm.umax.i8(i8 [[X:%.*]], i8 1)
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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 <2 x i8> @fold_add_sext_eq_4_6(<2 x i6> %xx) {
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; CHECK-LABEL: @fold_add_sext_eq_4_6(
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; CHECK-NEXT: [[X:%.*]] = zext <2 x i6> [[XX:%.*]] to <2 x i8>
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq <2 x i8> [[X]], <i8 4, i8 -127>
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; CHECK-NEXT: [[R:%.*]] = select <2 x i1> [[X_EQ]], <2 x i8> <i8 3, i8 -128>, <2 x i8> [[X]]
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; CHECK-NEXT: ret <2 x i8> [[R]]
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;
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%x = zext <2 x i6> %xx to <2 x i8>
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%x_eq = icmp eq <2 x i8> %x, <i8 4, i8 129>
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%x_eq_ext = sext <2 x i1> %x_eq to <2 x i8>
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%r = add <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 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]], [[X_EQ_EXT]]
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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_add_sext_eq_4_fail_wrong_cond(i8 %x, i8 %y) {
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; CHECK-LABEL: @fold_add_sext_eq_4_fail_wrong_cond(
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; CHECK-NEXT: [[X_EQ:%.*]] = icmp eq i8 [[Y:%.*]], 4
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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:%.*]], [[X_EQ_EXT]]
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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 %y, 4
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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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call void @use.i8(i8 %x_eq_ext)
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ret i8 %r
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}
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