i386's TCpuAsmOptimizer.RegReadByInstruction:
* mul doesn't read edx (unless included in operand)
* 8-bit mul and imul don't read ah (unless included in operand)
* 8-bit div and idiv don't read edx (unless included in operand)
git-svn-id: trunk@35958 -
i386's TCpuAsmOptimizer.RegReadByInstruction. Previously, the lack of this
check could generate false reads on some other register types (e.g. mmx/xmm/
flags, etc.), and this could worsen optimizations.
git-svn-id: trunk@35957 -
this removes the limit of 3 Ch_XXX flags per instruction (thus allowing adding
more precise flags, e.g. for tracking only certain bits of the flags register,
etc.) and avoids the ugliness of having the Ch_None filler, which makes
x86ins.dat less readable.
git-svn-id: trunk@35850 -
* AAA and AAS also read flags (AF)
* CMC reads and writes flags (it inverts CF)
* CMPSx and SCASx write flags
* CMPSx, SCASx, LODSx, STOSx, MOVSx read the direction flag
* NOT doesn't affect flags
* REP isn't affected by and doesn't affect flags
* REPE/REPNE/REPZ/REPNZ/REPC/REPNC don't write flags, only read them
* ROL and ROR don't read flags
* SAL doesn't read flags
* SHLD and SHRD don't read flags
git-svn-id: trunk@35849 -
reg, with a value >=32. The instruction is redundant, because the SHL/SHR
instructions already AND mask the shift count by 31.
git-svn-id: trunk@35836 -
be used (TBD in a future commit) for optimizing x:=-x and x:=not x on CPUs
that support performing these operations directly in memory (such as x86)
git-svn-id: trunk@35749 -
63, instead of comparing it to 64 and branching. Note that, although this
changes the behaviour of 64-bit shifts by values larger than 64 (when stored
in a variable), it actually makes them consistent with both the code,
generated on x86_64, as well as with 64-bit shift by constant on i386 itself.
git-svn-id: trunk@35727 -
ad hoc set constants containing varying number cdecl-like calling
conventions
o added pocall_sysv_abi_cdecl and pocall_ms_abi_cdecl to cstylearrayofconst
o also allow C-style blocks with mwpascal instead of cdecl (mwpascal = cdecl
with "const" = "constref" for record parameters)
o did not touch cases related to name mangling and import/export names,
because those are a real mess and easily break things left and right :/
git-svn-id: trunk@35479 -
o separate information for reading and writing, because e.g. in a
try-block, only the writes to local variables and parameters are
volatile (they have to be committed immediately in case the next
instruction causes an exception)
o for now, only references to absolute memory addresses are marked
as volatile
o the volatily information is (should be) properly maintained throughout
all code generators for all archictures with this patch
o no optimizers or other compiler infrastructure uses the volatility
information yet
o this functionality is not (yet) exposed at the language level, it
is only for internal code generator use right now
git-svn-id: trunk@34996 -
* It is now only used to select size of vector instructions (i.e. 128 or 256 bits)
* Scalar instructions reverted to use attsufINT suffix (selecting between 32 or 64 bits).
* Additionally, vcvtsi2sd and vcvtsi2ss with rm64 operand are x86_64 only.
git-svn-id: trunk@34942 -
it was AT_NONE, which is invalid and should never be used
* explicitly pass the correct value for all calls to those methods elsewhere
in the compiler
git-svn-id: trunk@34250 -
symbol is defined
o removed all places where AB_INDIRECT symbols were explicitly generated
o only generate AB_INDIRECT symbols for AT_DATA on systems_indirect_var_imports
o for some symbols an indirect symbol is always required (because they are
dereferenced by code in RTL units) -> use new AT_DATA_FORCEINDIRECT type
git-svn-id: trunk@34165 -
tasmdata.DefineAsmSymbol() and all routines that call it
o will be used to automatically generate AB_INDIRECT sybols when
necessary
git-svn-id: trunk@34164 -
