File: arm-be-result-return.c

package info (click to toggle)
llvm-toolchain-11 1%3A11.0.1-2~deb10u1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 995,836 kB
  • sloc: cpp: 4,767,656; ansic: 760,916; asm: 477,436; python: 170,940; objc: 69,804; lisp: 29,914; sh: 23,855; f90: 18,173; pascal: 7,551; perl: 7,471; ml: 5,603; awk: 3,489; makefile: 2,573; xml: 915; cs: 573; fortran: 503; javascript: 452
file content (37 lines) | stat: -rw-r--r-- 883 bytes parent folder | download | duplicates (23) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
 
// RUN: %clang_cc1 -triple armebv7-arm-none-eabi -emit-llvm -w -o - %s | FileCheck %s

// this tests for AAPCS section 5.4:
// A Composite Type not larger than 4 bytes is returned in r0.
// The format is as if the result had been stored in memory at a
// word-aligned address and then loaded into r0 with an LDR instruction

extern union Us { short s; } us;
union Us callee_us() { return us; }
// CHECK-LABEL: callee_us()
// CHECK: zext i16
// CHECK: shl 
// CHECK: ret i32

void caller_us() {
  us = callee_us();
// CHECK-LABEL: caller_us()
// CHECK: call i32
// CHECK: lshr i32
// CHECK: trunc i32
}

extern struct Ss { short s; } ss;
struct Ss callee_ss() { return ss; }
// CHECK-LABEL: callee_ss()
// CHECK: zext i16
// CHECK: shl 
// CHECK: ret i32

void caller_ss() {
  ss = callee_ss();
// CHECK-LABEL: caller_ss()
// CHECK: call i32
// CHECK: lshr i32
// CHECK: trunc i32
}