1 ; RUN: opt -S -basicaa -gvn -enable-load-pre %s | FileCheck %s 2 ; 3 ; The partially redundant load in bb1 should be hoisted to "bb". This comes 4 ; from this C code (GCC PR 23455): 5 ; unsigned outcnt; extern void flush_outbuf(void); 6 ; void bi_windup(unsigned char *outbuf, unsigned char bi_buf) { 7 ; outbuf[outcnt] = bi_buf; 8 ; if (outcnt == 16384) 9 ; flush_outbuf(); 10 ; outbuf[outcnt] = bi_buf; 11 ; } 12 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" 13 target triple = "i386-apple-darwin7" 14 @outcnt = common global i32 0 ; <i32*> [#uses=3] 15 16 define void @bi_windup(i8* %outbuf, i8 zeroext %bi_buf) nounwind { 17 entry: 18 %"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0] 19 %0 = load i32* @outcnt, align 4 ; <i32> [#uses=1] 20 %1 = getelementptr i8* %outbuf, i32 %0 ; <i8*> [#uses=1] 21 store i8 %bi_buf, i8* %1, align 1 22 %2 = load i32* @outcnt, align 4 ; <i32> [#uses=1] 23 %3 = icmp eq i32 %2, 16384 ; <i1> [#uses=1] 24 br i1 %3, label %bb, label %bb1 25 26 bb: ; preds = %entry 27 call void @flush_outbuf() nounwind 28 br label %bb1 29 30 bb1: ; preds = %bb, %entry 31 ; CHECK: bb1: 32 ; CHECK-NEXT: phi 33 ; CHECK-NEXT: getelementptr 34 %4 = load i32* @outcnt, align 4 ; <i32> [#uses=1] 35 %5 = getelementptr i8* %outbuf, i32 %4 ; <i8*> [#uses=1] 36 store i8 %bi_buf, i8* %5, align 1 37 ret void 38 } 39 40 declare void @flush_outbuf() 41
