|  | ; RUN: llc -O3 -mtriple arm64-apple-ios3 -aarch64-gep-opt=false %s -o - | FileCheck %s | 
|  | ; <rdar://problem/13621857> | 
|  |  | 
|  | @block = common global i8* null, align 8 | 
|  |  | 
|  | define i32 @fct(i32 %i1, i32 %i2) { | 
|  | ; CHECK: @fct | 
|  | ; Sign extension is used more than once, thus it should not be folded. | 
|  | ; CodeGenPrepare is not sharing sext across uses, thus this is folded because | 
|  | ; of that. | 
|  | ; _CHECK-NOT_: , sxtw] | 
|  | entry: | 
|  | %idxprom = sext i32 %i1 to i64 | 
|  | %0 = load i8** @block, align 8 | 
|  | %arrayidx = getelementptr inbounds i8* %0, i64 %idxprom | 
|  | %1 = load i8* %arrayidx, align 1 | 
|  | %idxprom1 = sext i32 %i2 to i64 | 
|  | %arrayidx2 = getelementptr inbounds i8* %0, i64 %idxprom1 | 
|  | %2 = load i8* %arrayidx2, align 1 | 
|  | %cmp = icmp eq i8 %1, %2 | 
|  | br i1 %cmp, label %if.end, label %if.then | 
|  |  | 
|  | if.then:                                          ; preds = %entry | 
|  | %cmp7 = icmp ugt i8 %1, %2 | 
|  | %conv8 = zext i1 %cmp7 to i32 | 
|  | br label %return | 
|  |  | 
|  | if.end:                                           ; preds = %entry | 
|  | %inc = add nsw i32 %i1, 1 | 
|  | %inc9 = add nsw i32 %i2, 1 | 
|  | %idxprom10 = sext i32 %inc to i64 | 
|  | %arrayidx11 = getelementptr inbounds i8* %0, i64 %idxprom10 | 
|  | %3 = load i8* %arrayidx11, align 1 | 
|  | %idxprom12 = sext i32 %inc9 to i64 | 
|  | %arrayidx13 = getelementptr inbounds i8* %0, i64 %idxprom12 | 
|  | %4 = load i8* %arrayidx13, align 1 | 
|  | %cmp16 = icmp eq i8 %3, %4 | 
|  | br i1 %cmp16, label %if.end23, label %if.then18 | 
|  |  | 
|  | if.then18:                                        ; preds = %if.end | 
|  | %cmp21 = icmp ugt i8 %3, %4 | 
|  | %conv22 = zext i1 %cmp21 to i32 | 
|  | br label %return | 
|  |  | 
|  | if.end23:                                         ; preds = %if.end | 
|  | %inc24 = add nsw i32 %i1, 2 | 
|  | %inc25 = add nsw i32 %i2, 2 | 
|  | %idxprom26 = sext i32 %inc24 to i64 | 
|  | %arrayidx27 = getelementptr inbounds i8* %0, i64 %idxprom26 | 
|  | %5 = load i8* %arrayidx27, align 1 | 
|  | %idxprom28 = sext i32 %inc25 to i64 | 
|  | %arrayidx29 = getelementptr inbounds i8* %0, i64 %idxprom28 | 
|  | %6 = load i8* %arrayidx29, align 1 | 
|  | %cmp32 = icmp eq i8 %5, %6 | 
|  | br i1 %cmp32, label %return, label %if.then34 | 
|  |  | 
|  | if.then34:                                        ; preds = %if.end23 | 
|  | %cmp37 = icmp ugt i8 %5, %6 | 
|  | %conv38 = zext i1 %cmp37 to i32 | 
|  | br label %return | 
|  |  | 
|  | return:                                           ; preds = %if.end23, %if.then34, %if.then18, %if.then | 
|  | %retval.0 = phi i32 [ %conv8, %if.then ], [ %conv22, %if.then18 ], [ %conv38, %if.then34 ], [ 1, %if.end23 ] | 
|  | ret i32 %retval.0 | 
|  | } | 
|  |  | 
|  | define i32 @fct1(i32 %i1, i32 %i2) optsize { | 
|  | ; CHECK: @fct1 | 
|  | ; Addressing are folded when optimizing for code size. | 
|  | ; CHECK: , sxtw] | 
|  | ; CHECK: , sxtw] | 
|  | entry: | 
|  | %idxprom = sext i32 %i1 to i64 | 
|  | %0 = load i8** @block, align 8 | 
|  | %arrayidx = getelementptr inbounds i8* %0, i64 %idxprom | 
|  | %1 = load i8* %arrayidx, align 1 | 
|  | %idxprom1 = sext i32 %i2 to i64 | 
|  | %arrayidx2 = getelementptr inbounds i8* %0, i64 %idxprom1 | 
|  | %2 = load i8* %arrayidx2, align 1 | 
|  | %cmp = icmp eq i8 %1, %2 | 
|  | br i1 %cmp, label %if.end, label %if.then | 
|  |  | 
|  | if.then:                                          ; preds = %entry | 
|  | %cmp7 = icmp ugt i8 %1, %2 | 
|  | %conv8 = zext i1 %cmp7 to i32 | 
|  | br label %return | 
|  |  | 
|  | if.end:                                           ; preds = %entry | 
|  | %inc = add nsw i32 %i1, 1 | 
|  | %inc9 = add nsw i32 %i2, 1 | 
|  | %idxprom10 = sext i32 %inc to i64 | 
|  | %arrayidx11 = getelementptr inbounds i8* %0, i64 %idxprom10 | 
|  | %3 = load i8* %arrayidx11, align 1 | 
|  | %idxprom12 = sext i32 %inc9 to i64 | 
|  | %arrayidx13 = getelementptr inbounds i8* %0, i64 %idxprom12 | 
|  | %4 = load i8* %arrayidx13, align 1 | 
|  | %cmp16 = icmp eq i8 %3, %4 | 
|  | br i1 %cmp16, label %if.end23, label %if.then18 | 
|  |  | 
|  | if.then18:                                        ; preds = %if.end | 
|  | %cmp21 = icmp ugt i8 %3, %4 | 
|  | %conv22 = zext i1 %cmp21 to i32 | 
|  | br label %return | 
|  |  | 
|  | if.end23:                                         ; preds = %if.end | 
|  | %inc24 = add nsw i32 %i1, 2 | 
|  | %inc25 = add nsw i32 %i2, 2 | 
|  | %idxprom26 = sext i32 %inc24 to i64 | 
|  | %arrayidx27 = getelementptr inbounds i8* %0, i64 %idxprom26 | 
|  | %5 = load i8* %arrayidx27, align 1 | 
|  | %idxprom28 = sext i32 %inc25 to i64 | 
|  | %arrayidx29 = getelementptr inbounds i8* %0, i64 %idxprom28 | 
|  | %6 = load i8* %arrayidx29, align 1 | 
|  | %cmp32 = icmp eq i8 %5, %6 | 
|  | br i1 %cmp32, label %return, label %if.then34 | 
|  |  | 
|  | if.then34:                                        ; preds = %if.end23 | 
|  | %cmp37 = icmp ugt i8 %5, %6 | 
|  | %conv38 = zext i1 %cmp37 to i32 | 
|  | br label %return | 
|  |  | 
|  | return:                                           ; preds = %if.end23, %if.then34, %if.then18, %if.then | 
|  | %retval.0 = phi i32 [ %conv8, %if.then ], [ %conv22, %if.then18 ], [ %conv38, %if.then34 ], [ 1, %if.end23 ] | 
|  | ret i32 %retval.0 | 
|  | } | 
|  |  | 
|  | ; CHECK: @test | 
|  | ; CHECK-NOT: , uxtw #2] | 
|  | define i32 @test(i32* %array, i8 zeroext %c, i32 %arg) { | 
|  | entry: | 
|  | %conv = zext i8 %c to i32 | 
|  | %add = sub i32 0, %arg | 
|  | %tobool = icmp eq i32 %conv, %add | 
|  | br i1 %tobool, label %if.end, label %if.then | 
|  |  | 
|  | if.then:                                          ; preds = %entry | 
|  | %idxprom = zext i8 %c to i64 | 
|  | %arrayidx = getelementptr inbounds i32* %array, i64 %idxprom | 
|  | %0 = load volatile i32* %arrayidx, align 4 | 
|  | %1 = load volatile i32* %arrayidx, align 4 | 
|  | %add3 = add nsw i32 %1, %0 | 
|  | br label %if.end | 
|  |  | 
|  | if.end:                                           ; preds = %entry, %if.then | 
|  | %res.0 = phi i32 [ %add3, %if.then ], [ 0, %entry ] | 
|  | ret i32 %res.0 | 
|  | } | 
|  |  | 
|  |  | 
|  | ; CHECK: @test2 | 
|  | ; CHECK: , uxtw #2] | 
|  | ; CHECK: , uxtw #2] | 
|  | define i32 @test2(i32* %array, i8 zeroext %c, i32 %arg) optsize { | 
|  | entry: | 
|  | %conv = zext i8 %c to i32 | 
|  | %add = sub i32 0, %arg | 
|  | %tobool = icmp eq i32 %conv, %add | 
|  | br i1 %tobool, label %if.end, label %if.then | 
|  |  | 
|  | if.then:                                          ; preds = %entry | 
|  | %idxprom = zext i8 %c to i64 | 
|  | %arrayidx = getelementptr inbounds i32* %array, i64 %idxprom | 
|  | %0 = load volatile i32* %arrayidx, align 4 | 
|  | %1 = load volatile i32* %arrayidx, align 4 | 
|  | %add3 = add nsw i32 %1, %0 | 
|  | br label %if.end | 
|  |  | 
|  | if.end:                                           ; preds = %entry, %if.then | 
|  | %res.0 = phi i32 [ %add3, %if.then ], [ 0, %entry ] | 
|  | ret i32 %res.0 | 
|  | } |