1; RUN: llc < %s -mtriple=arm-apple-ios -stop-after=branch-folder | FileCheck %s 2 3; Branch probability of tailed-merged block: 4; 5; p(L0_L1 -> L2) = p(entry -> L0) * p(L0 -> L2) + p(entry -> L1) * p(L1 -> L2) 6; = 0.2 * 0.6 + 0.8 * 0.3 = 0.36 7; p(L0_L1 -> L3) = p(entry -> L0) * p(L0 -> L3) + p(entry -> L1) * p(L1 -> L3) 8; = 0.2 * 0.4 + 0.8 * 0.7 = 0.64 9 10; CHECK: successors: %bb.{{[0-9]+}}(0x1999999a), %bb.{{[0-9]+}}(0x66666666) 11; CHECK: bb.{{[0-9]+}}{{[0-9a-zA-Z.]*}}: 12; CHECK: bb.{{[0-9]+}}{{[0-9a-zA-Z.]*}}: 13 14define i32 @test0(i32 %n, i32 %m, i32* nocapture %a, i32* nocapture %b) { 15entry: 16 %cmp = icmp sgt i32 %n, 0 17 br i1 %cmp, label %L0, label %L1, !prof !0 18 19L0: ; preds = %entry 20 store i32 12, i32* %a, align 4 21 store i32 18, i32* %b, align 4 22 %cmp1 = icmp eq i32 %m, 8 23 br i1 %cmp1, label %L2, label %L3, !prof !1 24 25L1: ; preds = %entry 26 store i32 14, i32* %a, align 4 27 store i32 18, i32* %b, align 4 28 %cmp3 = icmp eq i32 %m, 8 29 br i1 %cmp3, label %L2, label %L3, !prof !2 30 31L2: ; preds = %L1, %L0 32 br label %L3 33 34L3: ; preds = %L0, %L1, %L2 35 %retval.0 = phi i32 [ 100, %L2 ], [ 6, %L1 ], [ 6, %L0 ] 36 ret i32 %retval.0 37} 38 39!0 = !{!"branch_weights", i32 200, i32 800} 40!1 = !{!"branch_weights", i32 600, i32 400} 41!2 = !{!"branch_weights", i32 300, i32 700} 42