340 lines
13 KiB
LLVM
340 lines
13 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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;
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; Exercise folding of strncmp calls with constant arrays and nonconstant
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; sizes.
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declare i32 @strncmp(ptr, ptr, i64)
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@ax = external constant [8 x i8]
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@a01230123 = constant [8 x i8] c"01230123"
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@b01230123 = constant [8 x i8] c"01230123"
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@c01230129 = constant [8 x i8] c"01230129"
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@d9123_12 = constant [7 x i8] c"9123\0012"
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@e9123_34 = constant [7 x i8] c"9123\0034"
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; Exercise strncmp(A, B, N) folding of arrays with the same bytes.
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define void @fold_strncmp_a_b_n(ptr %pcmp, i64 %n) {
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; CHECK-LABEL: @fold_strncmp_a_b_n(
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; CHECK-NEXT: store i32 0, ptr [[PCMP:%.*]], align 4
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i64 [[N:%.*]], 0
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; CHECK-NEXT: [[TMP2:%.*]] = sext i1 [[TMP1]] to i32
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; CHECK-NEXT: [[S0_1:%.*]] = getelementptr i32, ptr [[PCMP]], i64 1
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; CHECK-NEXT: store i32 [[TMP2]], ptr [[S0_1]], align 4
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; CHECK-NEXT: [[TMP3:%.*]] = icmp ne i64 [[N]], 0
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; CHECK-NEXT: [[TMP4:%.*]] = sext i1 [[TMP3]] to i32
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; CHECK-NEXT: [[S0_2:%.*]] = getelementptr i32, ptr [[PCMP]], i64 2
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; CHECK-NEXT: store i32 [[TMP4]], ptr [[S0_2]], align 4
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; CHECK-NEXT: [[TMP5:%.*]] = icmp ne i64 [[N]], 0
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; CHECK-NEXT: [[TMP6:%.*]] = sext i1 [[TMP5]] to i32
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; CHECK-NEXT: [[S0_3:%.*]] = getelementptr i32, ptr [[PCMP]], i64 3
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; CHECK-NEXT: store i32 [[TMP6]], ptr [[S0_3]], align 4
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; CHECK-NEXT: [[S0_4:%.*]] = getelementptr i32, ptr [[PCMP]], i64 4
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; CHECK-NEXT: store i32 0, ptr [[S0_4]], align 4
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; CHECK-NEXT: [[TMP7:%.*]] = icmp ne i64 [[N]], 0
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; CHECK-NEXT: [[TMP8:%.*]] = sext i1 [[TMP7]] to i32
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; CHECK-NEXT: [[S0_5:%.*]] = getelementptr i32, ptr [[PCMP]], i64 5
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; CHECK-NEXT: store i32 [[TMP8]], ptr [[S0_5]], align 4
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; CHECK-NEXT: [[TMP9:%.*]] = icmp ne i64 [[N]], 0
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; CHECK-NEXT: [[TMP10:%.*]] = zext i1 [[TMP9]] to i32
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; CHECK-NEXT: [[S5_0:%.*]] = getelementptr i32, ptr [[PCMP]], i64 6
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; CHECK-NEXT: store i32 [[TMP10]], ptr [[S5_0]], align 4
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; CHECK-NEXT: ret void
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;
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%q1 = getelementptr [8 x i8], ptr @b01230123, i64 0, i64 1
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%q2 = getelementptr [8 x i8], ptr @b01230123, i64 0, i64 2
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%q3 = getelementptr [8 x i8], ptr @b01230123, i64 0, i64 3
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%q4 = getelementptr [8 x i8], ptr @b01230123, i64 0, i64 4
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%q5 = getelementptr [8 x i8], ptr @b01230123, i64 0, i64 5
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; Fold strncmp(a, b, n) to 0.
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%c0_0 = call i32 @strncmp(ptr @a01230123, ptr @b01230123, i64 %n)
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store i32 %c0_0, ptr %pcmp
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; Fold strncmp(a, b + 1, n) to N != 0 ? -1 : 0.
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%c0_1 = call i32 @strncmp(ptr @a01230123, ptr %q1, i64 %n)
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%s0_1 = getelementptr i32, ptr %pcmp, i64 1
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store i32 %c0_1, ptr %s0_1
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; Fold strncmp(a, b + 2, n) to N != 0 ? -1 : 0.
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%c0_2 = call i32 @strncmp(ptr @a01230123, ptr %q2, i64 %n)
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%s0_2 = getelementptr i32, ptr %pcmp, i64 2
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store i32 %c0_2, ptr %s0_2
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; Fold strncmp(a, b + 3, n) to N != 0 ? -1 : 0.
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%c0_3 = call i32 @strncmp(ptr @a01230123, ptr %q3, i64 %n)
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%s0_3 = getelementptr i32, ptr %pcmp, i64 3
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store i32 %c0_3, ptr %s0_3
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; Fold strncmp(a, b + 4, n) to 0.
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%c0_4 = call i32 @strncmp(ptr @a01230123, ptr %q4, i64 %n)
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%s0_4 = getelementptr i32, ptr %pcmp, i64 4
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store i32 %c0_4, ptr %s0_4
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; Fold strncmp(a, b + 5, n) to N != 0 ? -1 : 0.
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%c0_5 = call i32 @strncmp(ptr @a01230123, ptr %q5, i64 %n)
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%s0_5 = getelementptr i32, ptr %pcmp, i64 5
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store i32 %c0_5, ptr %s0_5
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; Fold strncmp(b + 5, a, n) to N != 0 ? +1 : 0.
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%c5_0 = call i32 @strncmp(ptr %q5, ptr @a01230123, i64 %n)
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%s5_0 = getelementptr i32, ptr %pcmp, i64 6
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store i32 %c5_0, ptr %s5_0
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ret void
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}
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; Vefify that a strncmp() call involving a constant array with unknown
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; contents is not folded.
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define void @call_strncmp_a_ax_n(ptr %pcmp, i64 %n) {
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; CHECK-LABEL: @call_strncmp_a_ax_n(
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; CHECK-NEXT: [[C0_0:%.*]] = call i32 @strncmp(ptr nonnull @a01230123, ptr nonnull @ax, i64 [[N:%.*]])
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; CHECK-NEXT: store i32 [[C0_0]], ptr [[PCMP:%.*]], align 4
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; CHECK-NEXT: ret void
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;
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; Do not fold strncmp(a, ax, n).
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%c0_0 = call i32 @strncmp(ptr @a01230123, ptr @ax, i64 %n)
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store i32 %c0_0, ptr %pcmp
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ret void
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}
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; Exercise strncmp(A, C, N) folding of arrays with the same leading bytes
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; but a difference in the trailing byte.
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define void @fold_strncmp_a_c_n(ptr %pcmp, i64 %n) {
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; CHECK-LABEL: @fold_strncmp_a_c_n(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i64 [[N:%.*]], 7
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; CHECK-NEXT: [[TMP2:%.*]] = sext i1 [[TMP1]] to i32
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; CHECK-NEXT: store i32 [[TMP2]], ptr [[PCMP:%.*]], align 4
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; CHECK-NEXT: [[TMP3:%.*]] = icmp ne i64 [[N]], 0
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; CHECK-NEXT: [[TMP4:%.*]] = sext i1 [[TMP3]] to i32
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; CHECK-NEXT: [[S0_1:%.*]] = getelementptr i32, ptr [[PCMP]], i64 1
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; CHECK-NEXT: store i32 [[TMP4]], ptr [[S0_1]], align 4
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; CHECK-NEXT: [[TMP5:%.*]] = icmp ne i64 [[N]], 0
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; CHECK-NEXT: [[TMP6:%.*]] = sext i1 [[TMP5]] to i32
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; CHECK-NEXT: [[S0_2:%.*]] = getelementptr i32, ptr [[PCMP]], i64 2
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; CHECK-NEXT: store i32 [[TMP6]], ptr [[S0_2]], align 4
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; CHECK-NEXT: [[TMP7:%.*]] = icmp ne i64 [[N]], 0
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; CHECK-NEXT: [[TMP8:%.*]] = sext i1 [[TMP7]] to i32
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; CHECK-NEXT: [[S0_3:%.*]] = getelementptr i32, ptr [[PCMP]], i64 3
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; CHECK-NEXT: store i32 [[TMP8]], ptr [[S0_3]], align 4
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; CHECK-NEXT: [[TMP9:%.*]] = icmp ugt i64 [[N]], 3
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; CHECK-NEXT: [[TMP10:%.*]] = sext i1 [[TMP9]] to i32
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; CHECK-NEXT: [[S0_4:%.*]] = getelementptr i32, ptr [[PCMP]], i64 4
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; CHECK-NEXT: store i32 [[TMP10]], ptr [[S0_4]], align 4
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; CHECK-NEXT: [[TMP11:%.*]] = icmp ugt i64 [[N]], 3
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; CHECK-NEXT: [[TMP12:%.*]] = sext i1 [[TMP11]] to i32
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; CHECK-NEXT: [[S0_5:%.*]] = getelementptr i32, ptr [[PCMP]], i64 5
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; CHECK-NEXT: store i32 [[TMP12]], ptr [[S0_5]], align 4
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; CHECK-NEXT: ret void
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;
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%q1 = getelementptr [8 x i8], ptr @c01230129, i64 0, i64 1
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%q2 = getelementptr [8 x i8], ptr @c01230129, i64 0, i64 2
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%q3 = getelementptr [8 x i8], ptr @c01230129, i64 0, i64 3
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%q4 = getelementptr [8 x i8], ptr @c01230129, i64 0, i64 4
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%q5 = getelementptr [8 x i8], ptr @c01230129, i64 0, i64 5
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; Fold strncmp(a, c, n) to N > 7 ? -1 : 0.
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%c0_0 = call i32 @strncmp(ptr @a01230123, ptr @c01230129, i64 %n)
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store i32 %c0_0, ptr %pcmp
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; Fold strncmp(a, c + 1, n) to N != 0 ? -1 : 0.
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%c0_1 = call i32 @strncmp(ptr @a01230123, ptr %q1, i64 %n)
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%s0_1 = getelementptr i32, ptr %pcmp, i64 1
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store i32 %c0_1, ptr %s0_1
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; Fold strncmp(a, c + 2, n) to N != 0 ? -1 : 0.
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%c0_2 = call i32 @strncmp(ptr @a01230123, ptr %q2, i64 %n)
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%s0_2 = getelementptr i32, ptr %pcmp, i64 2
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store i32 %c0_2, ptr %s0_2
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; Fold strncmp(a, c + 3, n) to N != 0 ? -1 : 0.
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%c0_3 = call i32 @strncmp(ptr @a01230123, ptr %q3, i64 %n)
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%s0_3 = getelementptr i32, ptr %pcmp, i64 3
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store i32 %c0_3, ptr %s0_3
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; Fold strncmp(a, c + 4, n) to N > 3 ? -1 : 0.
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%c0_4 = call i32 @strncmp(ptr @a01230123, ptr %q4, i64 %n)
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%s0_4 = getelementptr i32, ptr %pcmp, i64 4
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store i32 %c0_4, ptr %s0_4
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; Fold strncmp(a, c + 5, n) to N != 0 ? -1 : 0.
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%c0_5 = call i32 @strncmp(ptr @a01230123, ptr %q4, i64 %n)
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%s0_5 = getelementptr i32, ptr %pcmp, i64 5
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store i32 %c0_5, ptr %s0_5
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ret void
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}
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; Exercise strncmp(A, D, N) folding of arrays of different sizes and
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; a difference in the leading byte.
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define void @fold_strncmp_a_d_n(ptr %pcmp, i64 %n) {
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; CHECK-LABEL: @fold_strncmp_a_d_n(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i64 [[N:%.*]], 0
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; CHECK-NEXT: [[TMP2:%.*]] = sext i1 [[TMP1]] to i32
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; CHECK-NEXT: store i32 [[TMP2]], ptr [[PCMP:%.*]], align 4
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; CHECK-NEXT: [[TMP3:%.*]] = icmp ne i64 [[N]], 0
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; CHECK-NEXT: [[TMP4:%.*]] = sext i1 [[TMP3]] to i32
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; CHECK-NEXT: [[S0_1:%.*]] = getelementptr i32, ptr [[PCMP]], i64 1
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; CHECK-NEXT: store i32 [[TMP4]], ptr [[S0_1]], align 4
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; CHECK-NEXT: [[TMP5:%.*]] = icmp ugt i64 [[N]], 3
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; CHECK-NEXT: [[TMP6:%.*]] = zext i1 [[TMP5]] to i32
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; CHECK-NEXT: [[S1_1:%.*]] = getelementptr i32, ptr [[PCMP]], i64 2
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; CHECK-NEXT: store i32 [[TMP6]], ptr [[S1_1]], align 4
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; CHECK-NEXT: [[TMP7:%.*]] = icmp ugt i64 [[N]], 2
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; CHECK-NEXT: [[TMP8:%.*]] = zext i1 [[TMP7]] to i32
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; CHECK-NEXT: [[S2_2:%.*]] = getelementptr i32, ptr [[PCMP]], i64 3
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; CHECK-NEXT: store i32 [[TMP8]], ptr [[S2_2]], align 4
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; CHECK-NEXT: [[TMP9:%.*]] = icmp ne i64 [[N]], 0
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; CHECK-NEXT: [[TMP10:%.*]] = zext i1 [[TMP9]] to i32
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; CHECK-NEXT: [[S4_4:%.*]] = getelementptr i32, ptr [[PCMP]], i64 4
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; CHECK-NEXT: store i32 [[TMP10]], ptr [[S4_4]], align 4
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; CHECK-NEXT: [[TMP11:%.*]] = icmp ne i64 [[N]], 0
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; CHECK-NEXT: [[TMP12:%.*]] = sext i1 [[TMP11]] to i32
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; CHECK-NEXT: [[S4_4_2:%.*]] = getelementptr i32, ptr [[PCMP]], i64 5
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; CHECK-NEXT: store i32 [[TMP12]], ptr [[S4_4_2]], align 4
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; CHECK-NEXT: [[S5_5:%.*]] = getelementptr i32, ptr [[PCMP]], i64 6
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; CHECK-NEXT: store i32 0, ptr [[S5_5]], align 4
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; CHECK-NEXT: [[S6_6:%.*]] = getelementptr i32, ptr [[PCMP]], i64 7
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; CHECK-NEXT: store i32 0, ptr [[S6_6]], align 4
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; CHECK-NEXT: ret void
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;
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%p1 = getelementptr [8 x i8], ptr @a01230123, i64 0, i64 1
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%p2 = getelementptr [8 x i8], ptr @a01230123, i64 0, i64 2
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%p3 = getelementptr [8 x i8], ptr @a01230123, i64 0, i64 3
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%p4 = getelementptr [8 x i8], ptr @a01230123, i64 0, i64 4
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%p5 = getelementptr [8 x i8], ptr @a01230123, i64 0, i64 5
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%p6 = getelementptr [8 x i8], ptr @a01230123, i64 0, i64 6
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%q1 = getelementptr [7 x i8], ptr @d9123_12, i64 0, i64 1
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%q2 = getelementptr [7 x i8], ptr @d9123_12, i64 0, i64 2
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%q3 = getelementptr [7 x i8], ptr @d9123_12, i64 0, i64 3
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%q4 = getelementptr [7 x i8], ptr @d9123_12, i64 0, i64 4
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%q5 = getelementptr [7 x i8], ptr @d9123_12, i64 0, i64 5
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%q6 = getelementptr [7 x i8], ptr @d9123_12, i64 0, i64 6
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; Fold strncmp(a, d, n) to N != 0 ? -1 : 0.
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%c0_0 = call i32 @strncmp(ptr @a01230123, ptr @d9123_12, i64 %n)
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store i32 %c0_0, ptr %pcmp
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; Fold strncmp(a, d + 1, n) to N != 0 ? -1 : 0.
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%c0_1 = call i32 @strncmp(ptr @a01230123, ptr %q1, i64 %n)
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%s0_1 = getelementptr i32, ptr %pcmp, i64 1
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store i32 %c0_1, ptr %s0_1
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; Fold strncmp(a + 1, d + 1, n) N > 3 ? +1 : 0.
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%c1_1 = call i32 @strncmp(ptr %p1, ptr %q1, i64 %n)
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%s1_1 = getelementptr i32, ptr %pcmp, i64 2
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store i32 %c1_1, ptr %s1_1
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; Fold strncmp(a + 2, d + 2, n) N > 2 ? +1 : 0.
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%c2_2 = call i32 @strncmp(ptr %p2, ptr %q2, i64 %n)
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%s2_2 = getelementptr i32, ptr %pcmp, i64 3
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store i32 %c2_2, ptr %s2_2
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; Fold strncmp(a + 3, d + 3, n) N > 1 ? +1 : 0.
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%c3_3 = call i32 @strncmp(ptr %p3, ptr %q3, i64 %n)
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%s3_3 = getelementptr i32, ptr %pcmp, i64 4
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store i32 %c3_3, ptr %s3_3
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; Fold strncmp(a + 4, d + 4, n) N != 0 ? +1 : 0.
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%c4_4 = call i32 @strncmp(ptr %p4, ptr %q4, i64 %n)
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%s4_4 = getelementptr i32, ptr %pcmp, i64 4
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store i32 %c4_4, ptr %s4_4
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; Fold strncmp(d + 4, a + 4, n) N != 0 ? -1 : 0 (same as above but
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; with the array arguments reversed).
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%c4_4_2 = call i32 @strncmp(ptr %q4, ptr %p4, i64 %n)
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%s4_4_2 = getelementptr i32, ptr %pcmp, i64 5
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store i32 %c4_4_2, ptr %s4_4_2
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; Fold strncmp(a + 5, d + 5, n) to 0.
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%c5_5 = call i32 @strncmp(ptr %p5, ptr %q5, i64 %n)
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%s5_5 = getelementptr i32, ptr %pcmp, i64 6
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store i32 %c5_5, ptr %s5_5
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; Fold strncmp(a + 6, d + 6, n) to 0.
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%c6_6 = call i32 @strncmp(ptr %p6, ptr %q6, i64 %n)
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%s6_6 = getelementptr i32, ptr %pcmp, i64 7
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store i32 %c6_6, ptr %s6_6
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ret void
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}
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; Exercise strncmp(A, D, N) folding of arrays with the same bytes and
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; a nonzero size.
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define void @fold_strncmp_a_d_nz(ptr %pcmp, i64 %n) {
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; CHECK-LABEL: @fold_strncmp_a_d_nz(
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; CHECK-NEXT: store i32 -1, ptr [[PCMP:%.*]], align 4
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; CHECK-NEXT: ret void
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;
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%nz = or i64 %n, 1
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%c0_0 = call i32 @strncmp(ptr @a01230123, ptr @d9123_12, i64 %nz)
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store i32 %c0_0, ptr %pcmp
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ret void
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}
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; Exercise strncmp(D, E, N) folding of equal strings but unequal arrays.
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define void @fold_strncmp_d_e_n(ptr %pcmp, i64 %n) {
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; CHECK-LABEL: @fold_strncmp_d_e_n(
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; CHECK-NEXT: store i32 0, ptr [[PCMP:%.*]], align 4
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; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i64 [[N:%.*]], 0
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; CHECK-NEXT: [[TMP2:%.*]] = zext i1 [[TMP1]] to i32
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; CHECK-NEXT: [[S0_1:%.*]] = getelementptr i32, ptr [[PCMP]], i64 1
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; CHECK-NEXT: store i32 [[TMP2]], ptr [[S0_1]], align 4
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; CHECK-NEXT: [[TMP3:%.*]] = icmp ne i64 [[N]], 0
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; CHECK-NEXT: [[TMP4:%.*]] = sext i1 [[TMP3]] to i32
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; CHECK-NEXT: [[S1_0:%.*]] = getelementptr i32, ptr [[PCMP]], i64 2
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; CHECK-NEXT: store i32 [[TMP4]], ptr [[S1_0]], align 4
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; CHECK-NEXT: [[S1_1:%.*]] = getelementptr i32, ptr [[PCMP]], i64 3
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; CHECK-NEXT: store i32 0, ptr [[S1_1]], align 4
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; CHECK-NEXT: ret void
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;
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%p1 = getelementptr [7 x i8], ptr @d9123_12, i64 0, i64 1
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%q1 = getelementptr [7 x i8], ptr @e9123_34, i64 0, i64 1
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; Fold to 0.
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%c0_0 = call i32 @strncmp(ptr @d9123_12, ptr @e9123_34, i64 %n)
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store i32 %c0_0, ptr %pcmp
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; Fold to N ? +1 : 0.
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%c0_1 = call i32 @strncmp(ptr @d9123_12, ptr %q1, i64 %n)
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%s0_1 = getelementptr i32, ptr %pcmp, i64 1
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store i32 %c0_1, ptr %s0_1
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; Fold to N ? -1 : 0.
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%c1_0 = call i32 @strncmp(ptr %p1, ptr @e9123_34, i64 %n)
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%s1_0 = getelementptr i32, ptr %pcmp, i64 2
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store i32 %c1_0, ptr %s1_0
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; Fold to 0.
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%c1_1 = call i32 @strncmp(ptr %p1, ptr %q1, i64 %n)
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%s1_1 = getelementptr i32, ptr %pcmp, i64 3
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store i32 %c1_1, ptr %s1_1
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ret void
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}
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