| ; RUN: llc -mtriple=arm-apple-ios -print-machineinstrs=branch-folder \ |
| ; RUN: %s -o /dev/null 2>&1 | FileCheck %s |
| |
| ; Branch probability of tailed-merged block: |
| ; |
| ; p(L0_L1 -> L2) = p(entry -> L0) * p(L0 -> L2) + p(entry -> L1) * p(L1 -> L2) |
| ; = 0.2 * 0.6 + 0.8 * 0.3 = 0.36 |
| ; p(L0_L1 -> L3) = p(entry -> L0) * p(L0 -> L3) + p(entry -> L1) * p(L1 -> L3) |
| ; = 0.2 * 0.4 + 0.8 * 0.7 = 0.64 |
| |
| ; CHECK: # Machine code for function test0: |
| ; CHECK: successors: %bb.{{[0-9]+}}(0x1999999a), %bb.{{[0-9]+}}(0x66666666) |
| ; CHECK: bb.{{[0-9]+}}{{[0-9a-zA-Z.]*}}: |
| ; CHECK: bb.{{[0-9]+}}{{[0-9a-zA-Z.]*}}: |
| ; CHECK: # End machine code for function test0. |
| |
| define i32 @test0(i32 %n, i32 %m, i32* nocapture %a, i32* nocapture %b) { |
| entry: |
| %cmp = icmp sgt i32 %n, 0 |
| br i1 %cmp, label %L0, label %L1, !prof !0 |
| |
| L0: ; preds = %entry |
| store i32 12, i32* %a, align 4 |
| store i32 18, i32* %b, align 4 |
| %cmp1 = icmp eq i32 %m, 8 |
| br i1 %cmp1, label %L2, label %L3, !prof !1 |
| |
| L1: ; preds = %entry |
| store i32 14, i32* %a, align 4 |
| store i32 18, i32* %b, align 4 |
| %cmp3 = icmp eq i32 %m, 8 |
| br i1 %cmp3, label %L2, label %L3, !prof !2 |
| |
| L2: ; preds = %L1, %L0 |
| br label %L3 |
| |
| L3: ; preds = %L0, %L1, %L2 |
| %retval.0 = phi i32 [ 100, %L2 ], [ 6, %L1 ], [ 6, %L0 ] |
| ret i32 %retval.0 |
| } |
| |
| !0 = !{!"branch_weights", i32 200, i32 800} |
| !1 = !{!"branch_weights", i32 600, i32 400} |
| !2 = !{!"branch_weights", i32 300, i32 700} |