| ; RUN: opt -S -basicaa -gvn -enable-load-pre %s | FileCheck %s |
| ; |
| ; 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 |
| ; CHECK: bb1: |
| ; CHECK-NEXT: phi |
| ; CHECK-NEXT: getelementptr |
| %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() |
