1 ; RUN: llc -mtriple=arm-apple-ios -print-machineinstrs=branch-folder \ 2 ; RUN: %s -o /dev/null 2>&1 | FileCheck %s 3 4 ; Branch probability of tailed-merged block: 5 ; 6 ; p(L0_L1 -> L2) = p(entry -> L0) * p(L0 -> L2) + p(entry -> L1) * p(L1 -> L2) 7 ; = 0.2 * 0.6 + 0.8 * 0.3 = 0.36 8 ; p(L0_L1 -> L3) = p(entry -> L0) * p(L0 -> L3) + p(entry -> L1) * p(L1 -> L3) 9 ; = 0.2 * 0.4 + 0.8 * 0.7 = 0.64 10 11 ; CHECK: # Machine code for function test0: 12 ; CHECK: Successors according to CFG: BB#{{[0-9]+}}({{[0-9a-fx/= ]+}}20.00%) BB#{{[0-9]+}}({{[0-9a-fx/= ]+}}80.00%) 13 ; CHECK: BB#{{[0-9]+}}: 14 ; CHECK: BB#{{[0-9]+}}: 15 ; CHECK: # End machine code for function test0. 16 17 define i32 @test0(i32 %n, i32 %m, i32* nocapture %a, i32* nocapture %b) { 18 entry: 19 %cmp = icmp sgt i32 %n, 0 20 br i1 %cmp, label %L0, label %L1, !prof !0 21 22 L0: ; preds = %entry 23 store i32 12, i32* %a, align 4 24 store i32 18, i32* %b, align 4 25 %cmp1 = icmp eq i32 %m, 8 26 br i1 %cmp1, label %L2, label %L3, !prof !1 27 28 L1: ; preds = %entry 29 store i32 14, i32* %a, align 4 30 store i32 18, i32* %b, align 4 31 %cmp3 = icmp eq i32 %m, 8 32 br i1 %cmp3, label %L2, label %L3, !prof !2 33 34 L2: ; preds = %L1, %L0 35 br label %L3 36 37 L3: ; preds = %L0, %L1, %L2 38 %retval.0 = phi i32 [ 100, %L2 ], [ 6, %L1 ], [ 6, %L0 ] 39 ret i32 %retval.0 40 } 41 42 !0 = !{!"branch_weights", i32 200, i32 800} 43 !1 = !{!"branch_weights", i32 600, i32 400} 44 !2 = !{!"branch_weights", i32 300, i32 700} 45
