1*9880d681SAndroid Build Coastguard Worker; RUN: opt -S -basicaa -gvn -enable-load-pre < %s | FileCheck %s 2*9880d681SAndroid Build Coastguard Worker; 3*9880d681SAndroid Build Coastguard Worker; The partially redundant load in bb1 should be hoisted to "bb". This comes 4*9880d681SAndroid Build Coastguard Worker; from this C code (GCC PR 23455): 5*9880d681SAndroid Build Coastguard Worker; unsigned outcnt; extern void flush_outbuf(void); 6*9880d681SAndroid Build Coastguard Worker; void bi_windup(unsigned char *outbuf, unsigned char bi_buf) { 7*9880d681SAndroid Build Coastguard Worker; outbuf[outcnt] = bi_buf; 8*9880d681SAndroid Build Coastguard Worker; if (outcnt == 16384) 9*9880d681SAndroid Build Coastguard Worker; flush_outbuf(); 10*9880d681SAndroid Build Coastguard Worker; outbuf[outcnt] = bi_buf; 11*9880d681SAndroid Build Coastguard Worker; } 12*9880d681SAndroid Build Coastguard Workertarget 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*9880d681SAndroid Build Coastguard Workertarget triple = "i386-apple-darwin7" 14*9880d681SAndroid Build Coastguard Worker@outcnt = common global i32 0 ; <i32*> [#uses=3] 15*9880d681SAndroid Build Coastguard Worker 16*9880d681SAndroid Build Coastguard Workerdefine void @bi_windup(i8* %outbuf, i8 zeroext %bi_buf) nounwind { 17*9880d681SAndroid Build Coastguard Workerentry: 18*9880d681SAndroid Build Coastguard Worker %"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0] 19*9880d681SAndroid Build Coastguard Worker %0 = load i32, i32* @outcnt, align 4 ; <i32> [#uses=1] 20*9880d681SAndroid Build Coastguard Worker %1 = getelementptr i8, i8* %outbuf, i32 %0 ; <i8*> [#uses=1] 21*9880d681SAndroid Build Coastguard Worker store i8 %bi_buf, i8* %1, align 1 22*9880d681SAndroid Build Coastguard Worker %2 = load i32, i32* @outcnt, align 4 ; <i32> [#uses=1] 23*9880d681SAndroid Build Coastguard Worker %3 = icmp eq i32 %2, 16384 ; <i1> [#uses=1] 24*9880d681SAndroid Build Coastguard Worker br i1 %3, label %bb, label %bb1 25*9880d681SAndroid Build Coastguard Worker 26*9880d681SAndroid Build Coastguard Workerbb: ; preds = %entry 27*9880d681SAndroid Build Coastguard Worker call void @flush_outbuf() nounwind 28*9880d681SAndroid Build Coastguard Worker br label %bb1 29*9880d681SAndroid Build Coastguard Worker 30*9880d681SAndroid Build Coastguard Workerbb1: ; preds = %bb, %entry 31*9880d681SAndroid Build Coastguard Worker; CHECK: bb1: 32*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: phi 33*9880d681SAndroid Build Coastguard Worker; CHECK-NEXT: getelementptr 34*9880d681SAndroid Build Coastguard Worker %4 = load i32, i32* @outcnt, align 4 ; <i32> [#uses=1] 35*9880d681SAndroid Build Coastguard Worker %5 = getelementptr i8, i8* %outbuf, i32 %4 ; <i8*> [#uses=1] 36*9880d681SAndroid Build Coastguard Worker store i8 %bi_buf, i8* %5, align 1 37*9880d681SAndroid Build Coastguard Worker ret void 38*9880d681SAndroid Build Coastguard Worker} 39*9880d681SAndroid Build Coastguard Worker 40*9880d681SAndroid Build Coastguard Workerdeclare void @flush_outbuf() 41