File: n2927_2.c

package info (click to toggle)
llvm-toolchain-19 1%3A19.1.7-3
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,998,520 kB
  • sloc: cpp: 6,951,680; ansic: 1,486,157; asm: 913,598; python: 232,024; f90: 80,126; objc: 75,281; lisp: 37,276; pascal: 16,990; sh: 10,009; ml: 5,058; perl: 4,724; awk: 3,523; makefile: 3,167; javascript: 2,504; xml: 892; fortran: 664; cs: 573
file content (21 lines) | stat: -rw-r--r-- 577 bytes parent folder | download | duplicates (12) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
 
// RUN: %clang_cc1 -emit-llvm -o - -std=c2x %s | FileCheck %s

// C2x 6.7.2.5 EXAMPLE 5
unsigned long long vla_size(int n) {
// CHECK: vla_size

  return sizeof(
    typeof_unqual(char[n + 3])
  ); // execution-time sizeof, translation-time typeof operation
// CHECK: [[N_ADDR:%.*]] = alloca i32
// CHECK: store i32 {{%.*}} ptr [[N_ADDR]]
// CHECK: [[N:%.*]] = load i32, ptr [[N_ADDR]]
// CHECK: [[TEMP:%.*]] = add nsw i32 [[N]], 3
// CHECK: [[RET:%.*]] = zext i32 [[TEMP]] to i64
// CHECK: ret i64 [[RET]]
}

int main() {
  return (int)vla_size(10); // vla_size returns 13
}