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author | Stephen Hines <srhines@google.com> | 2014-12-01 14:51:49 -0800 |
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committer | Stephen Hines <srhines@google.com> | 2014-12-02 16:08:10 -0800 |
commit | 37ed9c199ca639565f6ce88105f9e39e898d82d0 (patch) | |
tree | 8fb36d3910e3ee4c4e1b7422f4f017108efc52f5 /test/CodeGen/ARM/tail-merge-branch-weight.ll | |
parent | d2327b22152ced7bc46dc629fc908959e8a52d03 (diff) | |
download | external_llvm-37ed9c199ca639565f6ce88105f9e39e898d82d0.zip external_llvm-37ed9c199ca639565f6ce88105f9e39e898d82d0.tar.gz external_llvm-37ed9c199ca639565f6ce88105f9e39e898d82d0.tar.bz2 |
Update aosp/master LLVM for rebase to r222494.
Change-Id: Ic787f5e0124df789bd26f3f24680f45e678eef2d
Diffstat (limited to 'test/CodeGen/ARM/tail-merge-branch-weight.ll')
-rw-r--r-- | test/CodeGen/ARM/tail-merge-branch-weight.ll | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/tail-merge-branch-weight.ll b/test/CodeGen/ARM/tail-merge-branch-weight.ll new file mode 100644 index 0000000..9b5d566 --- /dev/null +++ b/test/CodeGen/ARM/tail-merge-branch-weight.ll @@ -0,0 +1,44 @@ +; 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 according to CFG: BB#{{[0-9]+}}(13) BB#{{[0-9]+}}(24) +; CHECK: BB#{{[0-9]+}}: +; CHECK: BB#{{[0-9]+}}: +; 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 = metadata !{metadata !"branch_weights", i32 200, i32 800} +!1 = metadata !{metadata !"branch_weights", i32 600, i32 400} +!2 = metadata !{metadata !"branch_weights", i32 300, i32 700} |