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C codegen: preparations for better code generation

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This commit is contained in:
Andreas Rumpf
2019-05-25 20:53:00 +02:00
parent 3a06022071
commit 36a398d96f
1 changed files with 6 additions and 3 deletions
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9
compiler/ccgexprs.nim
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@@ -152,7 +152,7 @@ proc getStorageLoc(n: PNode): TStorageLoc =
result = getStorageLoc(n.sons[0])
else: result = OnUnknown
proc canMove(p: BProc, n: PNode): bool =
proc canMove(p: BProc, n: PNode; dest: TLoc): bool =
# for now we're conservative here:
if n.kind == nkBracket:
# This needs to be kept consistent with 'const' seq code
@@ -165,6 +165,9 @@ proc canMove(p: BProc, n: PNode): bool =
# Empty strings are codegen'd as NIM_NIL so it's just a pointer copy
return true
result = n.kind in nkCallKinds
#if not result and dest.k == locTemp:
# return true
#if result:
# echo n.info, " optimized ", n
# result = false
@@ -271,7 +274,7 @@ proc genAssignment(p: BProc, dest, src: TLoc, flags: TAssignmentFlags) =
of tySequence:
if p.config.selectedGC == gcDestructors:
genGenericAsgn(p, dest, src, flags)
elif (needToCopy notin flags and src.storage != OnStatic) or canMove(p, src.lode):
elif (needToCopy notin flags and src.storage != OnStatic) or canMove(p, src.lode, dest):
genRefAssign(p, dest, src)
else:
linefmt(p, cpsStmts, "#genericSeqAssign($1, $2, $3);$n",
@@ -280,7 +283,7 @@ proc genAssignment(p: BProc, dest, src: TLoc, flags: TAssignmentFlags) =
of tyString:
if p.config.selectedGC == gcDestructors:
genGenericAsgn(p, dest, src, flags)
elif (needToCopy notin flags and src.storage != OnStatic) or canMove(p, src.lode):
elif (needToCopy notin flags and src.storage != OnStatic) or canMove(p, src.lode, dest):
genRefAssign(p, dest, src)
else:
if (dest.storage == OnStack and p.config.selectedGC != gcGo) or not usesWriteBarrier(p.config):