; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
;
; Exercise folding of strncmp calls with constant arrays and nonconstant
; sizes.
declare i32 @strncmp(i8*, i8*, i64)
@ax = external constant [8 x i8]
@a01230123 = constant [8 x i8] c"01230123"
@b01230123 = constant [8 x i8] c"01230123"
@c01230129 = constant [8 x i8] c"01230129"
@d9123_12 = constant [7 x i8] c"9123\0012"
@e9123_34 = constant [7 x i8] c"9123\0034"
; Exercise strncmp(A, B, N) folding of arrays with the same bytes.
define void @fold_strncmp_a_b_n(i32* %pcmp, i64 %n) {
; CHECK-LABEL: @fold_strncmp_a_b_n(
; CHECK-NEXT: store i32 0, i32* [[PCMP:%.*]], align 4
; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i64 [[N:%.*]], 0
; CHECK-NEXT: [[TMP2:%.*]] = sext i1 [[TMP1]] to i32
; CHECK-NEXT: [[S0_1:%.*]] = getelementptr i32, i32* [[PCMP]], i64 1
; CHECK-NEXT: store i32 [[TMP2]], i32* [[S0_1]], align 4
; CHECK-NEXT: [[TMP3:%.*]] = icmp ne i64 [[N]], 0
; CHECK-NEXT: [[TMP4:%.*]] = sext i1 [[TMP3]] to i32
; CHECK-NEXT: [[S0_2:%.*]] = getelementptr i32, i32* [[PCMP]], i64 2
; CHECK-NEXT: store i32 [[TMP4]], i32* [[S0_2]], align 4
; CHECK-NEXT: [[TMP5:%.*]] = icmp ne i64 [[N]], 0
; CHECK-NEXT: [[TMP6:%.*]] = sext i1 [[TMP5]] to i32
; CHECK-NEXT: [[S0_3:%.*]] = getelementptr i32, i32* [[PCMP]], i64 3
; CHECK-NEXT: store i32 [[TMP6]], i32* [[S0_3]], align 4
; CHECK-NEXT: [[S0_4:%.*]] = getelementptr i32, i32* [[PCMP]], i64 4
; CHECK-NEXT: store i32 0, i32* [[S0_4]], align 4
; CHECK-NEXT: [[TMP7:%.*]] = icmp ne i64 [[N]], 0
; CHECK-NEXT: [[TMP8:%.*]] = sext i1 [[TMP7]] to i32
; CHECK-NEXT: [[S0_5:%.*]] = getelementptr i32, i32* [[PCMP]], i64 5
; CHECK-NEXT: store i32 [[TMP8]], i32* [[S0_5]], align 4
; CHECK-NEXT: [[TMP9:%.*]] = icmp ne i64 [[N]], 0
; CHECK-NEXT: [[TMP10:%.*]] = zext i1 [[TMP9]] to i32
; CHECK-NEXT: [[S5_0:%.*]] = getelementptr i32, i32* [[PCMP]], i64 6
; CHECK-NEXT: store i32 [[TMP10]], i32* [[S5_0]], align 4
; CHECK-NEXT: ret void
;
%p0 = getelementptr [8 x i8], [8 x i8]* @a01230123, i64 0, i64 0
%q0 = getelementptr [8 x i8], [8 x i8]* @b01230123, i64 0, i64 0
%q1 = getelementptr [8 x i8], [8 x i8]* @b01230123, i64 0, i64 1
%q2 = getelementptr [8 x i8], [8 x i8]* @b01230123, i64 0, i64 2
%q3 = getelementptr [8 x i8], [8 x i8]* @b01230123, i64 0, i64 3
%q4 = getelementptr [8 x i8], [8 x i8]* @b01230123, i64 0, i64 4
%q5 = getelementptr [8 x i8], [8 x i8]* @b01230123, i64 0, i64 5
; Fold strncmp(a, b, n) to 0.
%c0_0 = call i32 @strncmp(i8* %p0, i8* %q0, i64 %n)
%s0_0 = getelementptr i32, i32* %pcmp, i64 0
store i32 %c0_0, i32* %s0_0
; Fold strncmp(a, b + 1, n) to N != 0 ? -1 : 0.
%c0_1 = call i32 @strncmp(i8* %p0, i8* %q1, i64 %n)
%s0_1 = getelementptr i32, i32* %pcmp, i64 1
store i32 %c0_1, i32* %s0_1
; Fold strncmp(a, b + 2, n) to N != 0 ? -1 : 0.
%c0_2 = call i32 @strncmp(i8* %p0, i8* %q2, i64 %n)
%s0_2 = getelementptr i32, i32* %pcmp, i64 2
store i32 %c0_2, i32* %s0_2
; Fold strncmp(a, b + 3, n) to N != 0 ? -1 : 0.
%c0_3 = call i32 @strncmp(i8* %p0, i8* %q3, i64 %n)
%s0_3 = getelementptr i32, i32* %pcmp, i64 3
store i32 %c0_3, i32* %s0_3
; Fold strncmp(a, b + 4, n) to 0.
%c0_4 = call i32 @strncmp(i8* %p0, i8* %q4, i64 %n)
%s0_4 = getelementptr i32, i32* %pcmp, i64 4
store i32 %c0_4, i32* %s0_4
; Fold strncmp(a, b + 5, n) to N != 0 ? -1 : 0.
%c0_5 = call i32 @strncmp(i8* %p0, i8* %q5, i64 %n)
%s0_5 = getelementptr i32, i32* %pcmp, i64 5
store i32 %c0_5, i32* %s0_5
; Fold strncmp(b + 5, a, n) to N != 0 ? +1 : 0.
%c5_0 = call i32 @strncmp(i8* %q5, i8* %p0, i64 %n)
%s5_0 = getelementptr i32, i32* %pcmp, i64 6
store i32 %c5_0, i32* %s5_0
ret void
}
; Vefify that a strncmp() call involving a constant array with unknown
; contents is not folded.
define void @call_strncmp_a_ax_n(i32* %pcmp, i64 %n) {
; CHECK-LABEL: @call_strncmp_a_ax_n(
; CHECK-NEXT: [[C0_0:%.*]] = call i32 @strncmp(i8* getelementptr inbounds ([8 x i8], [8 x i8]* @a01230123, i64 0, i64 0), i8* getelementptr inbounds ([8 x i8], [8 x i8]* @ax, i64 0, i64 0), i64 [[N:%.*]])
; CHECK-NEXT: store i32 [[C0_0]], i32* [[PCMP:%.*]], align 4
; CHECK-NEXT: ret void
;
%p0 = getelementptr [8 x i8], [8 x i8]* @a01230123, i64 0, i64 0
%q0 = getelementptr [8 x i8], [8 x i8]* @ax, i64 0, i64 0
; Do not fold strncmp(a, ax, n).
%c0_0 = call i32 @strncmp(i8* %p0, i8* %q0, i64 %n)
%s0_0 = getelementptr i32, i32* %pcmp, i64 0
store i32 %c0_0, i32* %s0_0
ret void
}
; Exercise strncmp(A, C, N) folding of arrays with the same leading bytes
; but a difference in the trailing byte.
define void @fold_strncmp_a_c_n(i32* %pcmp, i64 %n) {
; CHECK-LABEL: @fold_strncmp_a_c_n(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ugt i64 [[N:%.*]], 7
; CHECK-NEXT: [[TMP2:%.*]] = sext i1 [[TMP1]] to i32
; CHECK-NEXT: store i32 [[TMP2]], i32* [[PCMP:%.*]], align 4
; CHECK-NEXT: [[TMP3:%.*]] = icmp ne i64 [[N]], 0
; CHECK-NEXT: [[TMP4:%.*]] = sext i1 [[TMP3]] to i32
; CHECK-NEXT: [[S0_1:%.*]] = getelementptr i32, i32* [[PCMP]], i64 1
; CHECK-NEXT: store i32 [[TMP4]], i32* [[S0_1]], align 4
; CHECK-NEXT: [[TMP5:%.*]] = icmp ne i64 [[N]], 0
; CHECK-NEXT: [[TMP6:%.*]] = sext i1 [[TMP5]] to i32
; CHECK-NEXT: [[S0_2:%.*]] = getelementptr i32, i32* [[PCMP]], i64 2
; CHECK-NEXT: store i32 [[TMP6]], i32* [[S0_2]], align 4
; CHECK-NEXT: [[TMP7:%.*]] = icmp ne i64 [[N]], 0
; CHECK-NEXT: [[TMP8:%.*]] = sext i1 [[TMP7]] to i32
; CHECK-NEXT: [[S0_3:%.*]] = getelementptr i32, i32* [[PCMP]], i64 3
; CHECK-NEXT: store i32 [[TMP8]], i32* [[S0_3]], align 4
; CHECK-NEXT: [[TMP9:%.*]] = icmp ugt i64 [[N]], 3
; CHECK-NEXT: [[TMP10:%.*]] = sext i1 [[TMP9]] to i32
; CHECK-NEXT: [[S0_4:%.*]] = getelementptr i32, i32* [[PCMP]], i64 4
; CHECK-NEXT: store i32 [[TMP10]], i32* [[S0_4]], align 4
; CHECK-NEXT: [[TMP11:%.*]] = icmp ugt i64 [[N]], 3
; CHECK-NEXT: [[TMP12:%.*]] = sext i1 [[TMP11]] to i32
; CHECK-NEXT: [[S0_5:%.*]] = getelementptr i32, i32* [[PCMP]], i64 5
; CHECK-NEXT: store i32 [[TMP12]], i32* [[S0_5]], align 4
; CHECK-NEXT: ret void
;
%p0 = getelementptr [8 x i8], [8 x i8]* @a01230123, i64 0, i64 0
%q0 = getelementptr [8 x i8], [8 x i8]* @c01230129, i64 0, i64 0
%q1 = getelementptr [8 x i8], [8 x i8]* @c01230129, i64 0, i64 1
%q2 = getelementptr [8 x i8], [8 x i8]* @c01230129, i64 0, i64 2
%q3 = getelementptr [8 x i8], [8 x i8]* @c01230129, i64 0, i64 3
%q4 = getelementptr [8 x i8], [8 x i8]* @c01230129, i64 0, i64 4
%q5 = getelementptr [8 x i8], [8 x i8]* @c01230129, i64 0, i64 5
; Fold strncmp(a, c, n) to N > 7 ? -1 : 0.
%c0_0 = call i32 @strncmp(i8* %p0, i8* %q0, i64 %n)
%s0_0 = getelementptr i32, i32* %pcmp, i64 0
store i32 %c0_0, i32* %s0_0
; Fold strncmp(a, c + 1, n) to N != 0 ? -1 : 0.
%c0_1 = call i32 @strncmp(i8* %p0, i8* %q1, i64 %n)
%s0_1 = getelementptr i32, i32* %pcmp, i64 1
store i32 %c0_1, i32* %s0_1
; Fold strncmp(a, c + 2, n) to N != 0 ? -1 : 0.
%c0_2 = call i32 @strncmp(i8* %p0, i8* %q2, i64 %n)
%s0_2 = getelementptr i32, i32* %pcmp, i64 2
store i32 %c0_2, i32* %s0_2
; Fold strncmp(a, c + 3, n) to N != 0 ? -1 : 0.
%c0_3 = call i32 @strncmp(i8* %p0, i8* %q3, i64 %n)
%s0_3 = getelementptr i32, i32* %pcmp, i64 3
store i32 %c0_3, i32* %s0_3
; Fold strncmp(a, c + 4, n) to N > 3 ? -1 : 0.
%c0_4 = call i32 @strncmp(i8* %p0, i8* %q4, i64 %n)
%s0_4 = getelementptr i32, i32* %pcmp, i64 4
store i32 %c0_4, i32* %s0_4
; Fold strncmp(a, c + 5, n) to N != 0 ? -1 : 0.
%c0_5 = call i32 @strncmp(i8* %p0, i8* %q4, i64 %n)
%s0_5 = getelementptr i32, i32* %pcmp, i64 5
store i32 %c0_5, i32* %s0_5
ret void
}
; Exercise strncmp(A, D, N) folding of arrays of different sizes and
; a difference in the leading byte.
define void @fold_strncmp_a_d_n(i32* %pcmp, i64 %n) {
; CHECK-LABEL: @fold_strncmp_a_d_n(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i64 [[N:%.*]], 0
; CHECK-NEXT: [[TMP2:%.*]] = sext i1 [[TMP1]] to i32
; CHECK-NEXT: store i32 [[TMP2]], i32* [[PCMP:%.*]], align 4
; CHECK-NEXT: [[TMP3:%.*]] = icmp ne i64 [[N]], 0
; CHECK-NEXT: [[TMP4:%.*]] = sext i1 [[TMP3]] to i32
; CHECK-NEXT: [[S0_1:%.*]] = getelementptr i32, i32* [[PCMP]], i64 1
; CHECK-NEXT: store i32 [[TMP4]], i32* [[S0_1]], align 4
; CHECK-NEXT: [[TMP5:%.*]] = icmp ugt i64 [[N]], 3
; CHECK-NEXT: [[TMP6:%.*]] = zext i1 [[TMP5]] to i32
; CHECK-NEXT: [[S1_1:%.*]] = getelementptr i32, i32* [[PCMP]], i64 2
; CHECK-NEXT: store i32 [[TMP6]], i32* [[S1_1]], align 4
; CHECK-NEXT: [[TMP7:%.*]] = icmp ugt i64 [[N]], 2
; CHECK-NEXT: [[TMP8:%.*]] = zext i1 [[TMP7]] to i32
; CHECK-NEXT: [[S2_2:%.*]] = getelementptr i32, i32* [[PCMP]], i64 3
; CHECK-NEXT: store i32 [[TMP8]], i32* [[S2_2]], align 4
; CHECK-NEXT: [[TMP9:%.*]] = icmp ne i64 [[N]], 0
; CHECK-NEXT: [[TMP10:%.*]] = zext i1 [[TMP9]] to i32
; CHECK-NEXT: [[S4_4:%.*]] = getelementptr i32, i32* [[PCMP]], i64 4
; CHECK-NEXT: store i32 [[TMP10]], i32* [[S4_4]], align 4
; CHECK-NEXT: [[TMP11:%.*]] = icmp ne i64 [[N]], 0
; CHECK-NEXT: [[TMP12:%.*]] = sext i1 [[TMP11]] to i32
; CHECK-NEXT: [[S4_4_2:%.*]] = getelementptr i32, i32* [[PCMP]], i64 5
; CHECK-NEXT: store i32 [[TMP12]], i32* [[S4_4_2]], align 4
; CHECK-NEXT: [[S5_5:%.*]] = getelementptr i32, i32* [[PCMP]], i64 6
; CHECK-NEXT: store i32 0, i32* [[S5_5]], align 4
; CHECK-NEXT: [[S6_6:%.*]] = getelementptr i32, i32* [[PCMP]], i64 7
; CHECK-NEXT: store i32 0, i32* [[S6_6]], align 4
; CHECK-NEXT: ret void
;
%p0 = getelementptr [8 x i8], [8 x i8]* @a01230123, i64 0, i64 0
%p1 = getelementptr [8 x i8], [8 x i8]* @a01230123, i64 0, i64 1
%p2 = getelementptr [8 x i8], [8 x i8]* @a01230123, i64 0, i64 2
%p3 = getelementptr [8 x i8], [8 x i8]* @a01230123, i64 0, i64 3
%p4 = getelementptr [8 x i8], [8 x i8]* @a01230123, i64 0, i64 4
%p5 = getelementptr [8 x i8], [8 x i8]* @a01230123, i64 0, i64 5
%p6 = getelementptr [8 x i8], [8 x i8]* @a01230123, i64 0, i64 6
%q0 = getelementptr [7 x i8], [7 x i8]* @d9123_12, i64 0, i64 0
%q1 = getelementptr [7 x i8], [7 x i8]* @d9123_12, i64 0, i64 1
%q2 = getelementptr [7 x i8], [7 x i8]* @d9123_12, i64 0, i64 2
%q3 = getelementptr [7 x i8], [7 x i8]* @d9123_12, i64 0, i64 3
%q4 = getelementptr [7 x i8], [7 x i8]* @d9123_12, i64 0, i64 4
%q5 = getelementptr [7 x i8], [7 x i8]* @d9123_12, i64 0, i64 5
%q6 = getelementptr [7 x i8], [7 x i8]* @d9123_12, i64 0, i64 6
; Fold strncmp(a, d, n) to N != 0 ? -1 : 0.
%c0_0 = call i32 @strncmp(i8* %p0, i8* %q0, i64 %n)
%s0_0 = getelementptr i32, i32* %pcmp, i64 0
store i32 %c0_0, i32* %s0_0
; Fold strncmp(a, d + 1, n) to N != 0 ? -1 : 0.
%c0_1 = call i32 @strncmp(i8* %p0, i8* %q1, i64 %n)
%s0_1 = getelementptr i32, i32* %pcmp, i64 1
store i32 %c0_1, i32* %s0_1
; Fold strncmp(a + 1, d + 1, n) N > 3 ? +1 : 0.
%c1_1 = call i32 @strncmp(i8* %p1, i8* %q1, i64 %n)
%s1_1 = getelementptr i32, i32* %pcmp, i64 2
store i32 %c1_1, i32* %s1_1
; Fold strncmp(a + 2, d + 2, n) N > 2 ? +1 : 0.
%c2_2 = call i32 @strncmp(i8* %p2, i8* %q2, i64 %n)
%s2_2 = getelementptr i32, i32* %pcmp, i64 3
store i32 %c2_2, i32* %s2_2
; Fold strncmp(a + 3, d + 3, n) N > 1 ? +1 : 0.
%c3_3 = call i32 @strncmp(i8* %p3, i8* %q3, i64 %n)
%s3_3 = getelementptr i32, i32* %pcmp, i64 4
store i32 %c3_3, i32* %s3_3
; Fold strncmp(a + 4, d + 4, n) N != 0 ? +1 : 0.
%c4_4 = call i32 @strncmp(i8* %p4, i8* %q4, i64 %n)
%s4_4 = getelementptr i32, i32* %pcmp, i64 4
store i32 %c4_4, i32* %s4_4
; Fold strncmp(d + 4, a + 4, n) N != 0 ? -1 : 0 (same as above but
; with the array arguments reversed).
%c4_4_2 = call i32 @strncmp(i8* %q4, i8* %p4, i64 %n)
%s4_4_2 = getelementptr i32, i32* %pcmp, i64 5
store i32 %c4_4_2, i32* %s4_4_2
; Fold strncmp(a + 5, d + 5, n) to 0.
%c5_5 = call i32 @strncmp(i8* %p5, i8* %q5, i64 %n)
%s5_5 = getelementptr i32, i32* %pcmp, i64 6
store i32 %c5_5, i32* %s5_5
; Fold strncmp(a + 6, d + 6, n) to 0.
%c6_6 = call i32 @strncmp(i8* %p6, i8* %q6, i64 %n)
%s6_6 = getelementptr i32, i32* %pcmp, i64 7
store i32 %c6_6, i32* %s6_6
ret void
}
; Exercise strncmp(A, D, N) folding of arrays with the same bytes and
; a nonzero size.
define void @fold_strncmp_a_d_nz(i32* %pcmp, i64 %n) {
; CHECK-LABEL: @fold_strncmp_a_d_nz(
; CHECK-NEXT: store i32 -1, i32* [[PCMP:%.*]], align 4
; CHECK-NEXT: ret void
;
%p0 = getelementptr [8 x i8], [8 x i8]* @a01230123, i64 0, i64 0
%q0 = getelementptr [7 x i8], [7 x i8]* @d9123_12, i64 0, i64 0
%nz = or i64 %n, 1
%c0_0 = call i32 @strncmp(i8* %p0, i8* %q0, i64 %nz)
%s0_0 = getelementptr i32, i32* %pcmp, i64 0
store i32 %c0_0, i32* %s0_0
ret void
}
; Exercise strncmp(D, E, N) folding of equal strings but unequal arrays.
define void @fold_strncmp_d_e_n(i32* %pcmp, i64 %n) {
; CHECK-LABEL: @fold_strncmp_d_e_n(
; CHECK-NEXT: store i32 0, i32* [[PCMP:%.*]], align 4
; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i64 [[N:%.*]], 0
; CHECK-NEXT: [[TMP2:%.*]] = zext i1 [[TMP1]] to i32
; CHECK-NEXT: [[S0_1:%.*]] = getelementptr i32, i32* [[PCMP]], i64 1
; CHECK-NEXT: store i32 [[TMP2]], i32* [[S0_1]], align 4
; CHECK-NEXT: [[TMP3:%.*]] = icmp ne i64 [[N]], 0
; CHECK-NEXT: [[TMP4:%.*]] = sext i1 [[TMP3]] to i32
; CHECK-NEXT: [[S1_0:%.*]] = getelementptr i32, i32* [[PCMP]], i64 2
; CHECK-NEXT: store i32 [[TMP4]], i32* [[S1_0]], align 4
; CHECK-NEXT: [[S1_1:%.*]] = getelementptr i32, i32* [[PCMP]], i64 3
; CHECK-NEXT: store i32 0, i32* [[S1_1]], align 4
; CHECK-NEXT: ret void
;
%p0 = getelementptr [7 x i8], [7 x i8]* @d9123_12, i64 0, i64 0
%p1 = getelementptr [7 x i8], [7 x i8]* @d9123_12, i64 0, i64 1
%q0 = getelementptr [7 x i8], [7 x i8]* @e9123_34, i64 0, i64 0
%q1 = getelementptr [7 x i8], [7 x i8]* @e9123_34, i64 0, i64 1
; Fold to 0.
%c0_0 = call i32 @strncmp(i8* %p0, i8* %q0, i64 %n)
%s0_0 = getelementptr i32, i32* %pcmp, i64 0
store i32 %c0_0, i32* %s0_0
; Fold to N ? +1 : 0.
%c0_1 = call i32 @strncmp(i8* %p0, i8* %q1, i64 %n)
%s0_1 = getelementptr i32, i32* %pcmp, i64 1
store i32 %c0_1, i32* %s0_1
; Fold to N ? -1 : 0.
%c1_0 = call i32 @strncmp(i8* %p1, i8* %q0, i64 %n)
%s1_0 = getelementptr i32, i32* %pcmp, i64 2
store i32 %c1_0, i32* %s1_0
; Fold to 0.
%c1_1 = call i32 @strncmp(i8* %p1, i8* %q1, i64 %n)
%s1_1 = getelementptr i32, i32* %pcmp, i64 3
store i32 %c1_1, i32* %s1_1
ret void
}