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0402fd9082
Remove OPTIONS support from library Haskell ports. Do not install documentation by library Haskell ports. Remove deprecation notice from library ports, that still needed. PR: 224083 Approved by: tcberner (mentor) Differential Revision: https://reviews.freebsd.org/D20247
231 lines
8.3 KiB
Text
231 lines
8.3 KiB
Text
From d8495549ba9d194815c2d0eaee6797fc7c00756a Mon Sep 17 00:00:00 2001
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From: Kavon Farvardin <kavon@farvard.in>
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Date: Sun, 28 Oct 2018 12:11:49 -0400
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Subject: [PATCH] Fix for T14251 on ARM
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We now calculate the SSE register padding needed to fix the calling
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convention in LLVM in a robust way: grouping them by whether
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registers in that class overlap (with the same class overlapping
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itself).
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My prior patch assumed that no matter the platform, physical
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register Fx aliases with Dx, etc, for our calling convention.
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This is unfortunately not the case for any platform except x86-64.
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Test Plan:
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Only know how to test on x86-64, but it should be tested on ARM with:
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`make test WAYS=llvm && make test WAYS=optllvm`
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Reviewers: bgamari, angerman
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Reviewed By: bgamari
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Subscribers: rwbarton, carter
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GHC Trac Issues: #15780, #14251, #15747
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Differential Revision: https://phabricator.haskell.org/D5254
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---
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compiler/llvmGen/LlvmCodeGen/Base.hs | 123 ++++++++++++++++++++++----------
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compiler/llvmGen/LlvmCodeGen/CodeGen.hs | 6 +-
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2 files changed, 90 insertions(+), 39 deletions(-)
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diff --git a/compiler/llvmGen/LlvmCodeGen/Base.hs b/compiler/llvmGen/LlvmCodeGen/Base.hs
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index ec91bac..0a40b73 100644
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--- compiler/llvmGen/LlvmCodeGen/Base.hs
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+++ compiler/llvmGen/LlvmCodeGen/Base.hs
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@@ -26,7 +26,7 @@ module LlvmCodeGen.Base (
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cmmToLlvmType, widthToLlvmFloat, widthToLlvmInt, llvmFunTy,
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llvmFunSig, llvmFunArgs, llvmStdFunAttrs, llvmFunAlign, llvmInfAlign,
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- llvmPtrBits, tysToParams, llvmFunSection, padLiveArgs, isSSE,
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+ llvmPtrBits, tysToParams, llvmFunSection, padLiveArgs, isFPR,
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strCLabel_llvm, strDisplayName_llvm, strProcedureName_llvm,
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getGlobalPtr, generateExternDecls,
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@@ -47,6 +47,7 @@ import CodeGen.Platform ( activeStgRegs )
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import DynFlags
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import FastString
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import Cmm hiding ( succ )
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+import CmmUtils ( regsOverlap )
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import Outputable as Outp
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import Platform
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import UniqFM
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@@ -58,8 +59,7 @@ import ErrUtils
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import qualified Stream
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import Control.Monad (ap)
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-import Data.List (sort)
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-import Data.Maybe (mapMaybe)
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+import Data.List (sort, groupBy, head)
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-- ----------------------------------------------------------------------------
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-- * Some Data Types
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@@ -152,36 +152,91 @@ llvmFunArgs dflags live =
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map (lmGlobalRegArg dflags) (filter isPassed allRegs)
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where platform = targetPlatform dflags
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allRegs = activeStgRegs platform
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- paddedLive = map (\(_,r) -> r) $ padLiveArgs live
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+ paddedLive = map (\(_,r) -> r) $ padLiveArgs dflags live
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isLive r = r `elem` alwaysLive || r `elem` paddedLive
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- isPassed r = not (isSSE r) || isLive r
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-
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-
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-isSSE :: GlobalReg -> Bool
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-isSSE (FloatReg _) = True
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-isSSE (DoubleReg _) = True
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-isSSE (XmmReg _) = True
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-isSSE (YmmReg _) = True
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-isSSE (ZmmReg _) = True
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-isSSE _ = False
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-
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-sseRegNum :: GlobalReg -> Maybe Int
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-sseRegNum (FloatReg i) = Just i
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-sseRegNum (DoubleReg i) = Just i
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-sseRegNum (XmmReg i) = Just i
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-sseRegNum (YmmReg i) = Just i
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-sseRegNum (ZmmReg i) = Just i
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-sseRegNum _ = Nothing
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-
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--- the bool indicates whether the global reg was added as padding.
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--- the returned list is not sorted in any particular order,
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--- but does indicate the set of live registers needed, with SSE padding.
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-padLiveArgs :: LiveGlobalRegs -> [(Bool, GlobalReg)]
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-padLiveArgs live = allRegs
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+ isPassed r = not (isFPR r) || isLive r
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+
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+
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+isFPR :: GlobalReg -> Bool
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+isFPR (FloatReg _) = True
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+isFPR (DoubleReg _) = True
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+isFPR (XmmReg _) = True
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+isFPR (YmmReg _) = True
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+isFPR (ZmmReg _) = True
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+isFPR _ = False
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+
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+sameFPRClass :: GlobalReg -> GlobalReg -> Bool
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+sameFPRClass (FloatReg _) (FloatReg _) = True
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+sameFPRClass (DoubleReg _) (DoubleReg _) = True
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+sameFPRClass (XmmReg _) (XmmReg _) = True
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+sameFPRClass (YmmReg _) (YmmReg _) = True
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+sameFPRClass (ZmmReg _) (ZmmReg _) = True
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+sameFPRClass _ _ = False
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+
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+normalizeFPRNum :: GlobalReg -> GlobalReg
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+normalizeFPRNum (FloatReg _) = FloatReg 1
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+normalizeFPRNum (DoubleReg _) = DoubleReg 1
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+normalizeFPRNum (XmmReg _) = XmmReg 1
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+normalizeFPRNum (YmmReg _) = YmmReg 1
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+normalizeFPRNum (ZmmReg _) = ZmmReg 1
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+normalizeFPRNum _ = error "normalizeFPRNum expected only FPR regs"
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+
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+getFPRCtor :: GlobalReg -> Int -> GlobalReg
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+getFPRCtor (FloatReg _) = FloatReg
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+getFPRCtor (DoubleReg _) = DoubleReg
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+getFPRCtor (XmmReg _) = XmmReg
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+getFPRCtor (YmmReg _) = YmmReg
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+getFPRCtor (ZmmReg _) = ZmmReg
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+getFPRCtor _ = error "getFPRCtor expected only FPR regs"
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+
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+fprRegNum :: GlobalReg -> Int
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+fprRegNum (FloatReg i) = i
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+fprRegNum (DoubleReg i) = i
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+fprRegNum (XmmReg i) = i
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+fprRegNum (YmmReg i) = i
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+fprRegNum (ZmmReg i) = i
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+fprRegNum _ = error "fprRegNum expected only FPR regs"
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+
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+-- | Input: dynflags, and the list of live registers
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+--
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+-- Output: An augmented list of live registers, where padding was
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+-- added to the list of registers to ensure the calling convention is
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+-- correctly used by LLVM.
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+--
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+-- Each global reg in the returned list is tagged with a bool, which
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+-- indicates whether the global reg was added as padding, or was an original
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+-- live register.
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+--
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+-- That is, True => padding, False => a real, live global register.
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+--
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+-- Also, the returned list is not sorted in any particular order.
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+--
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+padLiveArgs :: DynFlags -> LiveGlobalRegs -> [(Bool, GlobalReg)]
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+padLiveArgs dflags live =
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+ if platformUnregisterised plat
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+ then taggedLive -- not using GHC's register convention for platform.
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+ else padding ++ taggedLive
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+ where
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+ taggedLive = map (\x -> (False, x)) live
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+ plat = targetPlatform dflags
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+
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+ fprLive = filter isFPR live
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+ padding = concatMap calcPad $ groupBy sharesClass fprLive
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+
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+ sharesClass :: GlobalReg -> GlobalReg -> Bool
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+ sharesClass a b = sameFPRClass a b || overlappingClass
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+ where
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+ overlappingClass = regsOverlap dflags (norm a) (norm b)
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+ norm = CmmGlobal . normalizeFPRNum
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+
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+ calcPad :: [GlobalReg] -> [(Bool, GlobalReg)]
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+ calcPad rs = getFPRPadding (getFPRCtor $ head rs) rs
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+
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+getFPRPadding :: (Int -> GlobalReg) -> LiveGlobalRegs -> [(Bool, GlobalReg)]
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+getFPRPadding paddingCtor live = padding
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where
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- sseRegNums = sort $ mapMaybe sseRegNum live
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- (_, padding) = foldl assignSlots (1, []) $ sseRegNums
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- allRegs = padding ++ map (\r -> (False, r)) live
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+ fprRegNums = sort $ map fprRegNum live
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+ (_, padding) = foldl assignSlots (1, []) $ fprRegNums
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assignSlots (i, acc) regNum
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| i == regNum = -- don't need padding here
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@@ -195,11 +250,7 @@ padLiveArgs live = allRegs
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genPad start n =
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take n $ flip map (iterate (+1) start) (\i ->
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- (True, FloatReg i))
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- -- NOTE: Picking float should be fine for the following reasons:
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- -- (1) Float aliases with all the other SSE register types on
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- -- the given platform.
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- -- (2) The argument is not live anyways.
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+ (True, paddingCtor i))
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-- | Llvm standard fun attributes
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diff --git a/compiler/llvmGen/LlvmCodeGen/CodeGen.hs b/compiler/llvmGen/LlvmCodeGen/CodeGen.hs
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index 1873400..21abc65 100644
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--- compiler/llvmGen/LlvmCodeGen/CodeGen.hs
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+++ compiler/llvmGen/LlvmCodeGen/CodeGen.hs
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@@ -1814,14 +1814,14 @@ funPrologue live cmmBlocks = do
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-- STG Liveness optimisation done here.
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funEpilogue :: LiveGlobalRegs -> LlvmM ([LlvmVar], LlvmStatements)
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funEpilogue live = do
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+ dflags <- getDynFlags
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-- the bool indicates whether the register is padding.
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let alwaysNeeded = map (\r -> (False, r)) alwaysLive
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- livePadded = alwaysNeeded ++ padLiveArgs live
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+ livePadded = alwaysNeeded ++ padLiveArgs dflags live
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-- Set to value or "undef" depending on whether the register is
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-- actually live
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- dflags <- getDynFlags
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let loadExpr r = do
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(v, _, s) <- getCmmRegVal (CmmGlobal r)
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return (Just $ v, s)
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@@ -1833,7 +1833,7 @@ funEpilogue live = do
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loads <- flip mapM allRegs $ \r -> case () of
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_ | (False, r) `elem` livePadded
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-> loadExpr r -- if r is not padding, load it
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- | not (isSSE r) || (True, r) `elem` livePadded
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+ | not (isFPR r) || (True, r) `elem` livePadded
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-> loadUndef r
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| otherwise -> return (Nothing, nilOL)
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--
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1.9.1
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