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1; RUN: llc < %s -mtriple=thumbv7-apple-darwin -O3 -relocation-model=pic -arm-atomic-cfg-tidy=0 | FileCheck %s2; rdar://81154043; Tail merging must not split an IT block.4 5%struct.FILE = type { ptr, i32, i32, i16, i16, %struct.__sbuf, i32, ptr, ptr, ptr, ptr, ptr, %struct.__sbuf, ptr, i32, [3 x i8], [1 x i8], %struct.__sbuf, i32, i64 }6%struct._RuneCharClass = type { [14 x i8], i32 }7%struct._RuneEntry = type { i32, i32, i32, ptr }8%struct._RuneLocale = type { [8 x i8], [32 x i8], ptr, ptr, i32, [256 x i32], [256 x i32], [256 x i32], %struct._RuneRange, %struct._RuneRange, %struct._RuneRange, ptr, i32, i32, ptr }9%struct._RuneRange = type { i32, ptr }10%struct.__sFILEX = type opaque11%struct.__sbuf = type { ptr, i32 }12 13@finput = external global ptr ; <ptr> [#uses=1]14@_DefaultRuneLocale = external global %struct._RuneLocale ; <ptr> [#uses=0]15@token_buffer = external global [1025 x i8], align 4 ; <ptr> [#uses=1]16@.str73 = external constant [6 x i8], align 4 ; <ptr> [#uses=0]17@.str174 = external constant [5 x i8], align 4 ; <ptr> [#uses=0]18@.str275 = external constant [6 x i8], align 4 ; <ptr> [#uses=0]19@.str376 = external constant [5 x i8], align 4 ; <ptr> [#uses=0]20@.str477 = external constant [6 x i8], align 4 ; <ptr> [#uses=0]21@.str578 = external constant [6 x i8], align 4 ; <ptr> [#uses=0]22@.str679 = external constant [7 x i8], align 4 ; <ptr> [#uses=0]23@.str780 = external constant [6 x i8], align 4 ; <ptr> [#uses=0]24@.str881 = external constant [5 x i8], align 4 ; <ptr> [#uses=0]25@.str982 = external constant [6 x i8], align 4 ; <ptr> [#uses=0]26@.str1083 = external constant [9 x i8], align 4 ; <ptr> [#uses=0]27@.str1184 = external constant [7 x i8], align 4 ; <ptr> [#uses=0]28@.str1285 = external constant [16 x i8], align 4 ; <ptr> [#uses=0]29@.str1386 = external constant [12 x i8], align 4 ; <ptr> [#uses=0]30@.str1487 = external constant [5 x i8], align 4 ; <ptr> [#uses=0]31@llvm.used = external global [1 x ptr] ; <ptr> [#uses=0]32 33define fastcc i32 @parse_percent_token() nounwind {34entry:35; CHECK: pop36; CHECK: pop37; CHECK: pop38; CHECK: pop39; CHECK: pop40; CHECK: pop41; CHECK: pop42; Do not convert into single stream code. BranchProbability Analysis assumes43; that branches which goes to "ret" instruction have lower probabilities.44 switch i32 undef, label %bb7 [45 i32 37, label %bb4346 i32 48, label %bb547 i32 50, label %bb448 i32 60, label %bb249 i32 61, label %bb650 i32 62, label %bb351 i32 123, label %bb152 ]53 54bb1: ; preds = %entry55 ret i32 856 57bb2: ; preds = %entry58 ret i32 1559 60bb3: ; preds = %entry61 ret i32 1662 63bb4: ; preds = %entry64 ret i32 1765 66bb5: ; preds = %entry67 ret i32 968 69bb6: ; preds = %entry70 ret i32 1871 72bb7: ; preds = %entry73 br i1 undef, label %bb.i.i, label %bb1.i.i74 75bb.i.i: ; preds = %bb776 br i1 undef, label %bb43, label %bb1277 78bb1.i.i: ; preds = %bb779 unreachable80 81bb9: ; preds = %bb.i.i282 br i1 undef, label %bb10, label %bb1183 84bb10: ; preds = %bb985 br label %bb1186 87bb11: ; preds = %bb10, %bb988 %p.0 = phi ptr [ undef, %bb10 ], [ %p.1, %bb9 ] ; <ptr> [#uses=1]89 %0 = load ptr, ptr @finput, align 4 ; <ptr> [#uses=1]90 %1 = tail call i32 @getc(ptr %0) nounwind ; <i32> [#uses=0]91 br label %bb1292 93bb12: ; preds = %bb11, %bb.i.i94 %p.1 = phi ptr [ %p.0, %bb11 ], [ @token_buffer, %bb.i.i ] ; <ptr> [#uses=2]95 %2 = icmp ult i32 undef, 128 ; <i1> [#uses=1]96 br i1 %2, label %bb.i.i2, label %bb1.i.i397 98bb.i.i2: ; preds = %bb1299 %3 = load i32, ptr null, align 4 ; <i32> [#uses=1]100 %4 = lshr i32 %3, 8 ; <i32> [#uses=1]101 %.lobit.i1 = and i32 %4, 1 ; <i32> [#uses=1]102 %.not = icmp ne i32 %.lobit.i1, 0 ; <i1> [#uses=1]103 %or.cond = or i1 %.not, undef ; <i1> [#uses=1]104 br i1 %or.cond, label %bb9, label %bb14105 106bb1.i.i3: ; preds = %bb12107 unreachable108 109bb14: ; preds = %bb.i.i2110 store i8 0, ptr %p.1, align 1111 br i1 undef, label %bb43, label %bb15112 113bb15: ; preds = %bb14114 unreachable115 116bb43: ; preds = %bb14, %bb.i.i, %entry117 %.0 = phi i32 [ 7, %entry ], [ 24, %bb.i.i ], [ 9, %bb14 ] ; <i32> [#uses=1]118 ret i32 %.0119}120 121declare i32 @getc(ptr nocapture) nounwind122 123declare i32 @strcmp(ptr nocapture, ptr nocapture) nounwind readonly124 125declare i32 @__maskrune(i32, i32)126 127declare i32 @ungetc(i32, ptr nocapture) nounwind128