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| author | Dehao Chen <dehao@google.com> | 2016-09-19 16:33:41 +0000 |
|---|---|---|
| committer | Dehao Chen <dehao@google.com> | 2016-09-19 16:33:41 +0000 |
| commit | 82667d04c51434adb089b7676bd6e34ab80d9e65 (patch) | |
| tree | 65f8b6dc14012938adb82b11fbb8956ef3a60338 /llvm/test/Transforms/SampleProfile/fnptr.ll | |
| parent | 38e3731c470b569f8c61d7d919c726f48fca6521 (diff) | |
| download | bcm5719-llvm-82667d04c51434adb089b7676bd6e34ab80d9e65.tar.gz bcm5719-llvm-82667d04c51434adb089b7676bd6e34ab80d9e65.zip | |
Only set branch weight during sample pgo annotation when max_weight of the branch is non-zero. Otherwise use default static profile to set branch probability.
Summary: It does not make sense to set equal weights for all unkown branches as we have static branch prediction available.
Reviewers: dnovillo
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D24732
llvm-svn: 281912
Diffstat (limited to 'llvm/test/Transforms/SampleProfile/fnptr.ll')
| -rw-r--r-- | llvm/test/Transforms/SampleProfile/fnptr.ll | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/llvm/test/Transforms/SampleProfile/fnptr.ll b/llvm/test/Transforms/SampleProfile/fnptr.ll index 5359eee831f..f9a08a39550 100644 --- a/llvm/test/Transforms/SampleProfile/fnptr.ll +++ b/llvm/test/Transforms/SampleProfile/fnptr.ll @@ -12,8 +12,8 @@ ; CHECK: edge for.body3 -> if.else probability is 0x65a95a96 / 0x80000000 = 79.42% ; CHECK: edge for.inc -> for.inc12 probability is 0x000fdc50 / 0x80000000 = 0.05% ; CHECK: edge for.inc -> for.body3 probability is 0x7ff023b0 / 0x80000000 = 99.95% -; CHECK: edge for.inc12 -> for.end14 probability is 0x40000000 / 0x80000000 = 50.00% -; CHECK: edge for.inc12 -> for.cond1.preheader probability is 0x40000000 / 0x80000000 = 50.00% +; CHECK: edge for.inc12 -> for.end14 probability is 0x04000000 / 0x80000000 = 3.12% +; CHECK: edge for.inc12 -> for.cond1.preheader probability is 0x7c000000 / 0x80000000 = 96.88% ; Original C++ test case. ; @@ -88,7 +88,7 @@ for.body3: ; preds = %for.inc, %for.cond1 %call5 = tail call i32 @rand() #3, !dbg !16 %rem6 = srem i32 %call5, 100, !dbg !16 %cmp7 = icmp slt i32 %rem6, 10, !dbg !16 - br i1 %cmp7, label %if.then, label %if.else, !dbg !16, !prof !17 + br i1 %cmp7, label %if.then, label %if.else, !dbg !16 if.then: ; preds = %for.body3 %mul = mul nsw i32 %j.023, 300, !dbg !18 @@ -107,13 +107,13 @@ for.inc: ; preds = %if.then, %if.else %S.2 = fadd double %S.122, %call8.pn, !dbg !18 %inc = add nsw i32 %j.023, 1, !dbg !20 %exitcond = icmp eq i32 %j.023, 5999, !dbg !14 - br i1 %exitcond, label %for.inc12, label %for.body3, !dbg !14, !prof !21 + br i1 %exitcond, label %for.inc12, label %for.body3, !dbg !14 for.inc12: ; preds = %for.inc %S.2.lcssa = phi double [ %S.2, %for.inc ] %inc13 = add nsw i32 %i.025, 1, !dbg !22 %exitcond26 = icmp eq i32 %i.025, 9999, !dbg !12 - br i1 %exitcond26, label %for.end14, label %for.cond1.preheader, !dbg !12, !prof !23 + br i1 %exitcond26, label %for.end14, label %for.cond1.preheader, !dbg !12 for.end14: ; preds = %for.inc12 %S.2.lcssa.lcssa = phi double [ %S.2.lcssa, %for.inc12 ] @@ -148,13 +148,10 @@ declare i32 @printf(i8* nocapture readonly, ...) #1 !14 = !DILocation(line: 20, column: 5, scope: !13) !15 = !DILocation(line: 21, column: 15, scope: !13) !16 = !DILocation(line: 22, column: 11, scope: !13) -!17 = !{!"branch_weights", i32 534, i32 2064} !18 = !DILocation(line: 23, column: 14, scope: !13) !19 = !DILocation(line: 25, column: 14, scope: !13) !20 = !DILocation(line: 20, column: 28, scope: !13) -!21 = !{!"branch_weights", i32 0, i32 1075} !22 = !DILocation(line: 19, column: 26, scope: !13) -!23 = !{!"branch_weights", i32 0, i32 534} !24 = !DILocation(line: 27, column: 3, scope: !13) !25 = !DILocation(line: 28, column: 3, scope: !13) !26 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5 ", isOptimized: false, emissionKind: FullDebug, file: !4) |
