-Known bugs/issues in nativeGen, 000202 (JRS)
+Known bugs/issues in nativeGen, 000228 (JRS)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-All these bugs are for x86; I don't know about sparc/alpha.
-
-- absC -> stix translation for GET_TAG and in fact anything
to do with the packed-halfword layout info itbl field is
pretty dubious. I think I have it fixed for big and little
endian 32-bit, but it won't work at all on a 64 bit platform.
--- Most of the x86 insn selector code in MachCode.lhs needs to
- be checked against the Rules of the Game recorded in that file.
- I think there are a lot of subtle violations.
-
--- When selecting spill regs, don't use %eax if there is a CALL insn
- (perhaps excluding calls to newCAF, since it doesn't return a
- result).
-
--- Keep track of the stack offset so that correct spill code can
- be generated even if %esp moves. At the moment %esp doesn't
- move, so the problem doesn't exist, but there is a different
- problem: ccalls put args in memory below %esp and only move
- %esp immediately prior to the call. This is dangerous because
- (1) writing below %esp can cause a segmentation fault (as deemed
- by the OS), and (2) if a signal should be handled on that stack
- during argument construction, the args will get silently trashed.
-
- Currently, implementation of GITOF et al use the stack, so are
- incompatible with current ccall implementation. When the latter
- is fixed, GITOF et al should present no problem. Same issue
- applies to GCOS, GSIN, GTAN, GSQRT if they have to truncate their
- result to 32-bit float.
-
--- nofib/real/hidden gets slightly different FP answers from the
- via-C route; possibly due to exp/log not being done in-line.
+-- There may or may not be bugs in some of the x86 insn selector
+ code in MachCode.lhs. I have checked all of it against the
+ Rules of the Game (+ Rules of the game for Amodes) recorded in
+ that file, but am not 100% convinced that it is all correct.
+ I think most of it is, tho.
--- Possibly implement GLDZ and GLD1 as analogues of FLDZ and FLD1
- (x86), to reduce number of constants emitted in f-p code.
+-- It won't compile on Solaris or Alphas because the insn selectors
+ are not up-to-date.
+-- NCG introduces a massive space leak; I think it generates all the
+ assembly code before printing any of it out (a depressingly
+ familiar story ...). Fixing this will await a working heap profiler.
projects / ghc-hetmet.git / blobdiff