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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2;3; Verify that snprintf calls with a constant size not exceeding INT_MAX4; and a "%s" format string and a const string argument are transformed5; into memcpy. Also verify that a size in excess of INT_MAX prevents6; the transformation.7;8; RUN: opt < %s -passes=instcombine -S -data-layout="E" | FileCheck %s -check-prefixes=ANY,BE9; RUN: opt < %s -passes=instcombine -S -data-layout="e" | FileCheck %s -check-prefixes=ANY,LE10 11@pcnt_s = constant [3 x i8] c"%s\00"12@s = constant [4 x i8] c"123\00"13 14@adst = external global [0 x ptr]15@asiz = external global [0 x i32]16 17declare i32 @snprintf(ptr, i64, ptr, ...)18 19 20; Verify that all snprintf calls with a bound between INT_MAX and down21; to 0 are transformed to memcpy.22 23define void @fold_snprintf_pcnt_s() {24; BE-LABEL: @fold_snprintf_pcnt_s(25; BE-NEXT: [[PDIMAX:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 17179869176), align 826; BE-NEXT: store i32 825373440, ptr [[PDIMAX]], align 127; BE-NEXT: store i32 3, ptr @asiz, align 428; BE-NEXT: [[PD5:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 40), align 829; BE-NEXT: store i32 825373440, ptr [[PD5]], align 130; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 20), align 431; BE-NEXT: [[PD4:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 32), align 832; BE-NEXT: store i32 825373440, ptr [[PD4]], align 133; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 16), align 434; BE-NEXT: [[PD3:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 24), align 835; BE-NEXT: store i16 12594, ptr [[PD3]], align 136; BE-NEXT: [[ENDPTR:%.*]] = getelementptr inbounds nuw i8, ptr [[PD3]], i64 237; BE-NEXT: store i8 0, ptr [[ENDPTR]], align 138; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 12), align 439; BE-NEXT: [[PD2:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 16), align 840; BE-NEXT: store i8 49, ptr [[PD2]], align 141; BE-NEXT: [[ENDPTR1:%.*]] = getelementptr inbounds nuw i8, ptr [[PD2]], i64 142; BE-NEXT: store i8 0, ptr [[ENDPTR1]], align 143; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 8), align 444; BE-NEXT: [[PD1:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 8), align 845; BE-NEXT: store i8 0, ptr [[PD1]], align 146; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 4), align 447; BE-NEXT: store i32 3, ptr @asiz, align 448; BE-NEXT: ret void49;50; LE-LABEL: @fold_snprintf_pcnt_s(51; LE-NEXT: [[PDIMAX:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 17179869176), align 852; LE-NEXT: store i32 3355185, ptr [[PDIMAX]], align 153; LE-NEXT: store i32 3, ptr @asiz, align 454; LE-NEXT: [[PD5:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 40), align 855; LE-NEXT: store i32 3355185, ptr [[PD5]], align 156; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 20), align 457; LE-NEXT: [[PD4:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 32), align 858; LE-NEXT: store i32 3355185, ptr [[PD4]], align 159; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 16), align 460; LE-NEXT: [[PD3:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 24), align 861; LE-NEXT: store i16 12849, ptr [[PD3]], align 162; LE-NEXT: [[ENDPTR:%.*]] = getelementptr inbounds nuw i8, ptr [[PD3]], i64 263; LE-NEXT: store i8 0, ptr [[ENDPTR]], align 164; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 12), align 465; LE-NEXT: [[PD2:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 16), align 866; LE-NEXT: store i8 49, ptr [[PD2]], align 167; LE-NEXT: [[ENDPTR1:%.*]] = getelementptr inbounds nuw i8, ptr [[PD2]], i64 168; LE-NEXT: store i8 0, ptr [[ENDPTR1]], align 169; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 8), align 470; LE-NEXT: [[PD1:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 8), align 871; LE-NEXT: store i8 0, ptr [[PD1]], align 172; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 4), align 473; LE-NEXT: store i32 3, ptr @asiz, align 474; LE-NEXT: ret void75;76 77 %pdimax = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 2147483647)78 %nimax = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pdimax, i64 2147483647, ptr @pcnt_s, ptr @s)79 store i32 %nimax, ptr @asiz80 81 %pd5 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 5)82 %n5 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd5, i64 5, ptr @pcnt_s, ptr @s)83 store i32 %n5, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 5)84 85 %pd4 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 4)86 %n4 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd4, i64 4, ptr @pcnt_s, ptr @s)87 store i32 %n4, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 4)88 89 %pd3 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 3)90 %n3 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd3, i64 3, ptr @pcnt_s, ptr @s)91 store i32 %n3, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 3)92 93 %pd2 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 2)94 %n2 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd2, i64 2, ptr @pcnt_s, ptr @s)95 store i32 %n2, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 2)96 97 %pd1 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 1)98 %n1 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd1, i64 1, ptr @pcnt_s, ptr @s)99 store i32 %n1, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 1)100 101 %pd0 = load ptr, ptr @adst102 %n0 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd0, i64 0, ptr @pcnt_s, ptr @s)103 store i32 %n0, ptr @asiz104 105 ret void106}107 108 109; Verify that snprintf calls with a bound greater than INT_MAX are not110; transformed. POSIX requires implementations to set errno to EOVERFLOW111; so such calls could be folded to just that followed by returning -1.112 113define void @call_snprintf_pcnt_s_ximax() {114; ANY-LABEL: @call_snprintf_pcnt_s_ximax(115; ANY-NEXT: [[PDM1:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 8), align 8116; ANY-NEXT: [[NM1:%.*]] = call i32 (ptr, i64, ptr, ...) @snprintf(ptr noundef nonnull dereferenceable(1) [[PDM1]], i64 -1, ptr nonnull @pcnt_s, ptr nonnull @s)117; ANY-NEXT: store i32 [[NM1]], ptr getelementptr (i8, ptr @asiz, i64 4), align 4118; ANY-NEXT: [[PDIMAXP1:%.*]] = load ptr, ptr @adst, align 8119; ANY-NEXT: [[NIMAXP1:%.*]] = call i32 (ptr, i64, ptr, ...) @snprintf(ptr noundef nonnull dereferenceable(1) [[PDIMAXP1]], i64 2147483648, ptr nonnull @pcnt_s, ptr nonnull @s)120; ANY-NEXT: store i32 [[NIMAXP1]], ptr @asiz, align 4121; ANY-NEXT: ret void122;123 124 %pdm1 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 1)125 %nm1 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pdm1, i64 -1, ptr @pcnt_s, ptr @s)126 store i32 %nm1, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 1)127 128 %pdimaxp1 = load ptr, ptr @adst129 %nimaxp1 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pdimaxp1, i64 2147483648, ptr @pcnt_s, ptr @s)130 store i32 %nimaxp1, ptr @asiz131 132 ret void133}134