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
38
39
|
; RUN: llvm-as < %s | opt -gvn -enable-load-pre | llvm-dis > %t
; RUN: %prcontext bb1: 2 < %t | grep phi
; RUN: %prcontext bb1: 2 < %t | not grep load
;
; The partially redundant load in bb1 should be hoisted to "bb". This comes
; from this C code (GCC PR 23455):
; unsigned outcnt; extern void flush_outbuf(void);
; void bi_windup(unsigned char *outbuf, unsigned char bi_buf) {
; outbuf[outcnt] = bi_buf;
; if (outcnt == 16384)
; flush_outbuf();
; outbuf[outcnt] = bi_buf;
; }
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
target triple = "i386-apple-darwin7"
@outcnt = common global i32 0 ; <i32*> [#uses=3]
define void @bi_windup(i8* %outbuf, i8 zeroext %bi_buf) nounwind {
entry:
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
%0 = load i32* @outcnt, align 4 ; <i32> [#uses=1]
%1 = getelementptr i8* %outbuf, i32 %0 ; <i8*> [#uses=1]
store i8 %bi_buf, i8* %1, align 1
%2 = load i32* @outcnt, align 4 ; <i32> [#uses=1]
%3 = icmp eq i32 %2, 16384 ; <i1> [#uses=1]
br i1 %3, label %bb, label %bb1
bb: ; preds = %entry
call void @flush_outbuf() nounwind
br label %bb1
bb1: ; preds = %bb, %entry
%4 = load i32* @outcnt, align 4 ; <i32> [#uses=1]
%5 = getelementptr i8* %outbuf, i32 %4 ; <i8*> [#uses=1]
store i8 %bi_buf, i8* %5, align 1
ret void
}
declare void @flush_outbuf()
|
