File: 2009-03-04-MemCpyAlign.ll

package info (click to toggle)
llvm 2.6-9.1
  • links: PTS
  • area: main
  • in suites: squeeze
  • size: 57,604 kB
  • ctags: 44,336
  • sloc: cpp: 344,766; sh: 12,407; ansic: 10,617; ada: 3,070; ml: 2,505; perl: 2,496; makefile: 1,426; pascal: 1,163; exp: 389; asm: 307; python: 298; objc: 260; lisp: 182; csh: 117; xml: 38; f90: 36; tcl: 20
file content (19 lines) | stat: -rw-r--r-- 711 bytes parent folder | download 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
 
; The store into %p should end up with a known alignment of 1, since the memcpy
; is only known to access it with 1-byte alignment.
; RUN: llvm-as < %s | opt -scalarrepl | llvm-dis | grep {store i16 1, .*, align 1}
; PR3720

        %struct.st = type { i16 }

define void @f(i8* %p) nounwind {
entry:
        %s = alloca %struct.st, align 4  ; <%struct.st*> [#uses=2]
        %0 = getelementptr %struct.st* %s, i32 0, i32 0  ; <i16*> [#uses=1]
        store i16 1, i16* %0, align 4
        %s1 = bitcast %struct.st* %s to i8*  ; <i8*> [#uses=1]
        call void @llvm.memcpy.i32(i8* %p, i8* %s1, i32 2, i32 1)
        ret void
}

declare void @llvm.memcpy.i32(i8* nocapture, i8* nocapture, i32, i32) nounwind