1 ; RUN: llvm-as < %s | opt -gvn -enable-load-pre | llvm-dis > %t
2 ; RUN: %prcontext bb1: 2 < %t | grep phi
3 ; RUN: %prcontext bb1: 2 < %t | not grep load
5 ; The partially redundant load in bb1 should be hoisted to "bb". This comes
6 ; from this C code (GCC PR 23455):
7 ; unsigned outcnt; extern void flush_outbuf(void);
8 ; void bi_windup(unsigned char *outbuf, unsigned char bi_buf) {
9 ; outbuf[outcnt] = bi_buf;
10 ; if (outcnt == 16384)
12 ; outbuf[outcnt] = bi_buf;
14 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"
15 target triple = "i386-apple-darwin7"
16 @outcnt = common global i32 0 ; <i32*> [#uses=3]
18 define void @bi_windup(i8* %outbuf, i8 zeroext %bi_buf) nounwind {
20 %"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
21 %0 = load i32* @outcnt, align 4 ; <i32> [#uses=1]
22 %1 = getelementptr i8* %outbuf, i32 %0 ; <i8*> [#uses=1]
23 store i8 %bi_buf, i8* %1, align 1
24 %2 = load i32* @outcnt, align 4 ; <i32> [#uses=1]
25 %3 = icmp eq i32 %2, 16384 ; <i1> [#uses=1]
26 br i1 %3, label %bb, label %bb1
29 call void @flush_outbuf() nounwind
32 bb1: ; preds = %bb, %entry
33 %4 = load i32* @outcnt, align 4 ; <i32> [#uses=1]
34 %5 = getelementptr i8* %outbuf, i32 %4 ; <i8*> [#uses=1]
35 store i8 %bi_buf, i8* %5, align 1
39 declare void @flush_outbuf()