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| author | Simon Marlow <marlowsd@gmail.com> | 2015-09-21 09:14:33 +0100 |
|---|---|---|
| committer | Simon Marlow <marlowsd@gmail.com> | 2015-09-23 14:07:44 +0100 |
| commit | 939a7d6367501d43be73f4e41db7395af1194989 (patch) | |
| tree | e915a6cc270fca5e0b4c803b38e5467f9f4d61c3 /compiler/cmm/CmmParse.y | |
| parent | 65bf7baa81772b7f07a4c74d3510dbd2ef03592d (diff) | |
| download | haskell-939a7d6367501d43be73f4e41db7395af1194989.tar.gz | |
Annotate CmmBranch with an optional likely target
Summary:
This allows the code generator to give hints to later code generation
steps about which branch is most likely to be taken. Right now it
is only taken into account in one place: a special case in
CmmContFlowOpt that swapped branches over to maximise the chance of
fallthrough, which is now disabled when there is a likelihood setting.
Test Plan: validate
Reviewers: austin, simonpj, bgamari, ezyang, tibbe
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D1273
Diffstat (limited to 'compiler/cmm/CmmParse.y')
| -rw-r--r-- | compiler/cmm/CmmParse.y | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/cmm/CmmParse.y b/compiler/cmm/CmmParse.y index ea0f4a5a66..dbd5d06872 100644 --- a/compiler/cmm/CmmParse.y +++ b/compiler/cmm/CmmParse.y @@ -1268,7 +1268,7 @@ cmmRawIf cond then_id = do -- branching to true_id if so, and falling through otherwise. emitCond (BoolTest e) then_id = do else_id <- newBlockId - emit (mkCbranch e then_id else_id) + emit (mkCbranch e then_id else_id Nothing) emitLabel else_id emitCond (BoolNot (BoolTest (CmmMachOp op args))) then_id | Just op' <- maybeInvertComparison op |