; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
;
; Verify that snprintf calls with a constant size not exceeding INT_MAX
; and constant format string with no formatting directives are transformed
; into memcpy. Also verify that a size in excess of INT_MAX prevents
; the transformation.
;
; RUN: opt < %s -passes=instcombine -S -data-layout="E" | FileCheck %s -check-prefixes=ANY,BE
; RUN: opt < %s -passes=instcombine -S -data-layout="e" | FileCheck %s -check-prefixes=ANY,LE
@s = constant [4 x i8] c"123\00"
@adst = external global [0 x ptr]
@asiz = external global [0 x i32]
declare i32 @snprintf(ptr, i64, ptr, ...)
; Verify that all snprintf calls with a bound between INT_MAX and down
; to 0 are transformed to memcpy.
define void @fold_snprintf_fmt() {
; BE-LABEL: @fold_snprintf_fmt(
; BE-NEXT: [[PDIMAX:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 17179869176), align 8
; BE-NEXT: store i32 825373440, ptr [[PDIMAX]], align 1
; BE-NEXT: store i32 3, ptr @asiz, align 4
; BE-NEXT: [[PD5:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 40), align 8
; BE-NEXT: store i32 825373440, ptr [[PD5]], align 1
; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 20), align 4
; BE-NEXT: [[PD4:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 32), align 8
; BE-NEXT: store i32 825373440, ptr [[PD4]], align 1
; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 16), align 4
; BE-NEXT: [[PD3:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 24), align 8
; BE-NEXT: store i16 12594, ptr [[PD3]], align 1
; BE-NEXT: [[ENDPTR:%.*]] = getelementptr inbounds i8, ptr [[PD3]], i64 2
; BE-NEXT: store i8 0, ptr [[ENDPTR]], align 1
; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 12), align 4
; BE-NEXT: [[PD2:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 16), align 8
; BE-NEXT: store i8 49, ptr [[PD2]], align 1
; BE-NEXT: [[ENDPTR1:%.*]] = getelementptr inbounds i8, ptr [[PD2]], i64 1
; BE-NEXT: store i8 0, ptr [[ENDPTR1]], align 1
; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 8), align 4
; BE-NEXT: [[PD1:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 8), align 8
; BE-NEXT: store i8 0, ptr [[PD1]], align 1
; BE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 4), align 4
; BE-NEXT: store i32 3, ptr @asiz, align 4
; BE-NEXT: ret void
;
; LE-LABEL: @fold_snprintf_fmt(
; LE-NEXT: [[PDIMAX:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 17179869176), align 8
; LE-NEXT: store i32 3355185, ptr [[PDIMAX]], align 1
; LE-NEXT: store i32 3, ptr @asiz, align 4
; LE-NEXT: [[PD5:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 40), align 8
; LE-NEXT: store i32 3355185, ptr [[PD5]], align 1
; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 20), align 4
; LE-NEXT: [[PD4:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 32), align 8
; LE-NEXT: store i32 3355185, ptr [[PD4]], align 1
; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 16), align 4
; LE-NEXT: [[PD3:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 24), align 8
; LE-NEXT: store i16 12849, ptr [[PD3]], align 1
; LE-NEXT: [[ENDPTR:%.*]] = getelementptr inbounds i8, ptr [[PD3]], i64 2
; LE-NEXT: store i8 0, ptr [[ENDPTR]], align 1
; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 12), align 4
; LE-NEXT: [[PD2:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 16), align 8
; LE-NEXT: store i8 49, ptr [[PD2]], align 1
; LE-NEXT: [[ENDPTR1:%.*]] = getelementptr inbounds i8, ptr [[PD2]], i64 1
; LE-NEXT: store i8 0, ptr [[ENDPTR1]], align 1
; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 8), align 4
; LE-NEXT: [[PD1:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 8), align 8
; LE-NEXT: store i8 0, ptr [[PD1]], align 1
; LE-NEXT: store i32 3, ptr getelementptr (i8, ptr @asiz, i64 4), align 4
; LE-NEXT: store i32 3, ptr @asiz, align 4
; LE-NEXT: ret void
;
%pdimax = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 2147483647)
%nimax = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pdimax, i64 2147483647, ptr @s)
store i32 %nimax, ptr @asiz
%pd5 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 5)
%n5 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd5, i64 5, ptr @s)
store i32 %n5, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 5)
%pd4 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 4)
%n4 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd4, i64 4, ptr @s)
store i32 %n4, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 4)
%pd3 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 3)
%n3 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd3, i64 3, ptr @s)
store i32 %n3, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 3)
%pd2 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 2)
%n2 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd2, i64 2, ptr @s)
store i32 %n2, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 2)
%pd1 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 1)
%n1 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd1, i64 1, ptr @s)
store i32 %n1, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 1)
%pd0 = load ptr, ptr @adst
%n0 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pd0, i64 0, ptr @s)
store i32 %n0, ptr @asiz
ret void
}
; Verify that snprintf calls with a bound greater than INT_MAX are not
; transformed. POSIX requires implementations to set errno to EOVERFLOW
; so such calls could be folded to just that followed by returning -1.
define void @call_snprintf_fmt_ximax() {
; ANY-LABEL: @call_snprintf_fmt_ximax(
; ANY-NEXT: [[PDM1:%.*]] = load ptr, ptr getelementptr (i8, ptr @adst, i64 8), align 8
; ANY-NEXT: [[NM1:%.*]] = call i32 (ptr, i64, ptr, ...) @snprintf(ptr noundef nonnull dereferenceable(1) [[PDM1]], i64 -1, ptr nonnull @s)
; ANY-NEXT: store i32 [[NM1]], ptr getelementptr (i8, ptr @asiz, i64 4), align 4
; ANY-NEXT: [[PDIMAXP1:%.*]] = load ptr, ptr @adst, align 8
; ANY-NEXT: [[NIMAXP1:%.*]] = call i32 (ptr, i64, ptr, ...) @snprintf(ptr noundef nonnull dereferenceable(1) [[PDIMAXP1]], i64 2147483648, ptr nonnull @s)
; ANY-NEXT: store i32 [[NIMAXP1]], ptr @asiz, align 4
; ANY-NEXT: ret void
;
%pdm1 = load ptr, ptr getelementptr ([0 x ptr], ptr @adst, i32 0, i32 1)
%nm1 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pdm1, i64 -1, ptr @s)
store i32 %nm1, ptr getelementptr ([0 x i32], ptr @asiz, i32 0, i32 1)
%pdimaxp1 = load ptr, ptr @adst
%nimaxp1 = call i32 (ptr, i64, ptr, ...) @snprintf(ptr %pdimaxp1, i64 2147483648, ptr @s)
store i32 %nimaxp1, ptr @asiz
ret void
}
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