File: x32-function_pointer-3.ll

package info (click to toggle)
llvm-toolchain-11 1%3A11.0.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 995,808 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 (30 lines) | stat: -rw-r--r-- 848 bytes parent folder | download | duplicates (19) 
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
 
; RUN: llc < %s -mtriple=x86_64-linux-gnux32 | FileCheck %s
; RUN: llc < %s -mtriple=x86_64-linux-gnux32 -fast-isel | FileCheck %s

; Test calling function pointer passed in struct

;    The function argument `h' in

;    struct foo {
;      void (*f) (void);
;      int i;
;    };
;    void
;    bar (struct foo h)
;    {
;      h.f ();
;    }

;    is passed in the 64-bit %rdi register.  The `f' field is in the lower 32
;    bits of %rdi register and the `i' field is in the upper 32 bits of %rdi
;    register.  We need to zero-extend %edi to %rdi before branching via %rdi.

define void @bar(i64 %h.coerce) nounwind {
entry:
  %h.sroa.0.0.extract.trunc = trunc i64 %h.coerce to i32
  %0 = inttoptr i32 %h.sroa.0.0.extract.trunc to void ()*
; CHECK: movl	%edi, %e[[REG:.*]]
  tail call void %0() nounwind
; CHECK: jmpq	*%r[[REG]]
  ret void
}