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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/nativeGen/AsmCodeGen.hs | |
| 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/nativeGen/AsmCodeGen.hs')
| -rw-r--r-- | compiler/nativeGen/AsmCodeGen.hs | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/compiler/nativeGen/AsmCodeGen.hs b/compiler/nativeGen/AsmCodeGen.hs index 44c57459a8..2e5caf4b74 100644 --- a/compiler/nativeGen/AsmCodeGen.hs +++ b/compiler/nativeGen/AsmCodeGen.hs @@ -1046,12 +1046,12 @@ cmmStmtConFold stmt args' <- mapM (cmmExprConFold DataReference) args return $ CmmUnsafeForeignCall target' regs args' - CmmCondBranch test true false + CmmCondBranch test true false likely -> do test' <- cmmExprConFold DataReference test return $ case test' of CmmLit (CmmInt 0 _) -> CmmBranch false CmmLit (CmmInt _ _) -> CmmBranch true - _other -> CmmCondBranch test' true false + _other -> CmmCondBranch test' true false likely CmmSwitch expr ids -> do expr' <- cmmExprConFold DataReference expr |