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| author | Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> | 1998-02-27 02:10:47 +0000 |
|---|---|---|
| committer | Andreas Schwab <schwab@gcc.gnu.org> | 1998-02-27 02:10:47 +0000 |
| commit | 0fd12b044999cb90ede68a0573445e2280de1a20 (patch) | |
| tree | 27190d3c408b6cfd49db318cb0cb7ce9297e85d5 | |
| parent | acbce66755fe7b7e252103c12102ef5d8b193321 (diff) | |
| download | gcc-0fd12b044999cb90ede68a0573445e2280de1a20.zip gcc-0fd12b044999cb90ede68a0573445e2280de1a20.tar.gz gcc-0fd12b044999cb90ede68a0573445e2280de1a20.tar.bz2 | |
m68k.md (movsf+1): Optimize moving a CONST_DOUBLE zero.
* config/m68k/m68k.md (movsf+1): Optimize moving a CONST_DOUBLE
zero.
From-SVN: r18278
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/config/m68k/m68k.md | 36 |
2 files changed, 41 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index ccd60ef..e4a4f98 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Fri Feb 27 11:02:47 1998 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> + + * config/m68k/m68k.md (movsf+1): Optimize moving a CONST_DOUBLE + zero. + 1998-02-26 Ken Raeburn <raeburn@cygnus.com> * regclass.c (init_reg_sets): Move init of move cost tables... diff --git a/gcc/config/m68k/m68k.md b/gcc/config/m68k/m68k.md index ddcac65..183d130 100644 --- a/gcc/config/m68k/m68k.md +++ b/gcc/config/m68k/m68k.md @@ -1099,6 +1099,42 @@ return \"fmove%.s %1,%-\;move%.l %+,%0\"; return \"fmove%.s %f1,%0\"; } + if (operands[1] == CONST0_RTX (SFmode) + /* clr insns on 68000 read before writing. + This isn't so on the 68010, but we have no TARGET_68010. */ + && ((TARGET_68020 || TARGET_5200) + || !(GET_CODE (operands[0]) == MEM && MEM_VOLATILE_P (operands[0])))) + { + if (ADDRESS_REG_P (operands[0])) + { + /* On the '040, 'subl an,an' takes 2 clocks while lea takes only 1 */ + if (!TARGET_68040 && !TARGET_68060) + return \"sub%.l %0,%0\"; + else + { +#ifdef MOTOROLA +#ifdef SGS + /* Many SGS assemblers croak on size specifiers for constants. */ + return \"lea 0,%0\"; +#else + return \"lea 0.w,%0\"; +#endif +#else + return \"lea 0:w,%0\"; +#endif + } + } + /* moveq is faster on the 68000. */ + if (DATA_REG_P (operands[0]) && !(TARGET_68020 || TARGET_5200)) + { +#if defined(MOTOROLA) && !defined(CRDS) + return \"moveq%.l %#0,%0\"; +#else + return \"moveq %#0,%0\"; +#endif + } + return \"clr%.l %0\"; + } return \"move%.l %1,%0\"; }") |