1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py 2; 3; Verify that snprintf calls with a constant size not exceeding INT_MAX 4; and constant format string with no formatting directives are transformed 5; into memcpy. Also verify that a size in excess of INT_MAX prevents 6; the transformation. 7; 8; RUN: opt < %s -passes=instcombine -S -data-layout="E" | FileCheck %s -check-prefixes=ANY,BE 9; RUN: opt < %s -passes=instcombine -S -data-layout="e" | FileCheck %s -check-prefixes=ANY,LE 10 11@s = constant [4 x i8] c"123\00" 12 13@adst = external global [0 x ptr] 14@asiz = external global [0 x i32] 15 16declare i32 @snprintf(ptr, i64, ptr, ...) 17 18 19; Verify that all snprintf calls with a bound between INT_MAX and down 20; to 0 are transformed to memcpy. 21 22define void @fold_snprintf_fmt() { 23; BE-LABEL: @fold_snprintf_fmt( 24; BE-NEXT: [[PDIMAX:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 17179869176), align 8 25; BE-NEXT: store i32 825373440, ptr [[PDIMAX]], align 1 26; BE-NEXT: store i32 3, ptr @asiz, align 4 27; BE-NEXT: [[PD5:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 40), align 8 28; BE-NEXT: store i32 825373440, ptr [[PD5]], align 1 29; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 20), align 4 30; BE-NEXT: [[PD4:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 32), align 8 31; BE-NEXT: store i32 825373440, ptr [[PD4]], align 1 32; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 16), align 4 33; BE-NEXT: [[PD3:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 24), align 8 34; BE-NEXT: store i16 12594, ptr [[PD3]], align 1 35; BE-NEXT: [[ENDPTR:%.*]] = getelementptr inbounds nuw i8, ptr [[PD3]], i64 2 36; BE-NEXT: store i8 0, ptr [[ENDPTR]], align 1 37; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 12), align 4 38; BE-NEXT: [[PD2:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 16), align 8 39; BE-NEXT: store i8 49, ptr [[PD2]], align 1 40; BE-NEXT: [[ENDPTR1:%.*]] = getelementptr inbounds nuw i8, ptr [[PD2]], i64 1 41; BE-NEXT: store i8 0, ptr [[ENDPTR1]], align 1 42; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 8), align 4 43; BE-NEXT: [[PD1:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 8), align 8 44; BE-NEXT: store i8 0, ptr [[PD1]], align 1 45; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 4), align 4 46; BE-NEXT: store i32 3, ptr @asiz, align 4 47; BE-NEXT: ret void 48; 49; LE-LABEL: @fold_snprintf_fmt( 50; LE-NEXT: [[PDIMAX:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 17179869176), align 8 51; LE-NEXT: store i32 3355185, ptr [[PDIMAX]], align 1 52; LE-NEXT: store i32 3, ptr @asiz, align 4 53; LE-NEXT: [[PD5:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 40), align 8 54; LE-NEXT: store i32 3355185, ptr [[PD5]], align 1 55; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 20), align 4 56; LE-NEXT: [[PD4:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 32), align 8 57; LE-NEXT: store i32 3355185, ptr [[PD4]], align 1 58; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 16), align 4 59; LE-NEXT: [[PD3:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 24), align 8 60; LE-NEXT: store i16 12849, ptr [[PD3]], align 1 61; LE-NEXT: [[ENDPTR:%.*]] = getelementptr inbounds nuw i8, ptr [[PD3]], i64 2 62; LE-NEXT: store i8 0, ptr [[ENDPTR]], align 1 63; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 12), align 4 64; LE-NEXT: [[PD2:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 16), align 8 65; LE-NEXT: store i8 49, ptr [[PD2]], align 1 66; LE-NEXT: [[ENDPTR1:%.*]] = getelementptr inbounds nuw i8, ptr [[PD2]], i64 1 67; LE-NEXT: store i8 0, ptr [[ENDPTR1]], align 1 68; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 8), align 4 69; LE-NEXT: [[PD1:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 8), align 8 70; LE-NEXT: store i8 0, ptr [[PD1]], align 1 71; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 4), align 4 72; LE-NEXT: store i32 3, ptr @asiz, align 4 73; LE-NEXT: ret void 74; 75 76 %pdimax = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 2147483647) 77 %nimax = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pdimax, i64 2147483647, ptr @s) 78 store i32 %nimax, ptr @asiz 79 80 %pd5 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 5) 81 %n5 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd5, i64 5, ptr @s) 82 store i32 %n5, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 5) 83 84 %pd4 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 4) 85 %n4 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd4, i64 4, ptr @s) 86 store i32 %n4, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 4) 87 88 %pd3 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 3) 89 %n3 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd3, i64 3, ptr @s) 90 store i32 %n3, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 3) 91 92 %pd2 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 2) 93 %n2 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd2, i64 2, ptr @s) 94 store i32 %n2, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 2) 95 96 %pd1 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 1) 97 %n1 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd1, i64 1, ptr @s) 98 store i32 %n1, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 1) 99 100 %pd0 = load ptr, ptr @adst 101 %n0 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd0, i64 0, ptr @s) 102 store i32 %n0, ptr @asiz 103 104 ret void 105} 106 107 108; Verify that snprintf calls with a bound greater than INT_MAX are not 109; transformed. POSIX requires implementations to set errno to EOVERFLOW 110; so such calls could be folded to just that followed by returning -1. 111 112define void @call_snprintf_fmt_ximax() { 113; ANY-LABEL: @call_snprintf_fmt_ximax( 114; ANY-NEXT: [[PDM1:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 8), align 8 115; ANY-NEXT: [[NM1:%.*]] = call i32 (ptr, i64, ptr, ...) @snprintf(ptr noundef nonnull dereferenceable(1) [[PDM1]], i64 -1, ptr nonnull @s) 116; ANY-NEXT: store i32 [[NM1]], ptr getelementptr (i8, ptr @asiz, i64 4), align 4 117; ANY-NEXT: [[PDIMAXP1:%.*]] = load ptr, ptr @adst, align 8 118; ANY-NEXT: [[NIMAXP1:%.*]] = call i32 (ptr, i64, ptr, ...) @snprintf(ptr noundef nonnull dereferenceable(1) [[PDIMAXP1]], i64 2147483648, ptr nonnull @s) 119; ANY-NEXT: store i32 [[NIMAXP1]], ptr @asiz, align 4 120; ANY-NEXT: ret void 121; 122 123 %pdm1 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 1) 124 %nm1 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pdm1, i64 -1, ptr @s) 125 store i32 %nm1, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 1) 126 127 %pdimaxp1 = load ptr, ptr @adst 128 %nimaxp1 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pdimaxp1, i64 2147483648, ptr @s) 129 store i32 %nimaxp1, ptr @asiz 130 131 ret void 132} 133