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| author | Richard Kenner <kenner@gcc.gnu.org> | 1994-03-25 17:51:43 -0500 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1994-03-25 17:51:43 -0500 |
| commit | 5bf136183fbfdb7ee77b9a825308c075826832bf (patch) | |
| tree | 913ed64da4b0dfe7b31552755ea327dd6ae5e172 /gcc/config | |
| parent | 3d0f0ad043e5469b9149cb56dc4d17313c2a768e (diff) | |
| download | gcc-5bf136183fbfdb7ee77b9a825308c075826832bf.zip gcc-5bf136183fbfdb7ee77b9a825308c075826832bf.tar.gz gcc-5bf136183fbfdb7ee77b9a825308c075826832bf.tar.bz2 | |
(movsi): New strategy for moving small constants into dregs, if it
can't be done with moveq.
From-SVN: r6902
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/m68k/m68k.md | 43 |
1 files changed, 8 insertions, 35 deletions
diff --git a/gcc/config/m68k/m68k.md b/gcc/config/m68k/m68k.md index a237325..d5220aa 100644 --- a/gcc/config/m68k/m68k.md +++ b/gcc/config/m68k/m68k.md @@ -763,45 +763,18 @@ return \"moveq %1,%0\"; #endif } -#ifndef NO_ADDSUB_Q - else if (DATA_REG_P (operands[0]) - /* Do this with a moveq #N-8, dreg; addq #8,dreg */ - && INTVAL (operands[1]) < 136 - && INTVAL (operands[1]) >= 128) - { - operands[1] = gen_rtx (CONST_INT, VOIDmode, INTVAL (operands[1]) - 8); -#if defined(MOTOROLA) && !defined(CRDS) - return \"moveq%.l %1,%0\;addq%.w %#8,%0\"; -#else - return \"moveq %1,%0\;addq%.w %#8,%0\"; -#endif - } else if (DATA_REG_P (operands[0]) - /* Do this with a moveq #N+8, dreg; subq #8,dreg */ - && INTVAL (operands[1]) < -128 - && INTVAL (operands[1]) >= -136) + /* if -256 < N < 256 but N is not in range for a moveq + N^ff will be, so use moveq #N^ff, dreg; not.b dreg. */ + && INTVAL (operands[1]) < 256 + && INTVAL (operands[1]) >= -256) { - operands[1] = gen_rtx (CONST_INT, VOIDmode, INTVAL (operands[1]) + 8); + operands[1] = gen_rtx (CONST_INT, VOIDmode, INTVAL (operands[1]) ^ 0xff); #if defined(MOTOROLA) && !defined(CRDS) - return \"moveq%.l %1,%0;subq%.w %#8,%0\"; + return \"moveq%.l %1,%0\;not%.b %0\"; #else - return \"moveq %1,%0;subq%.w %#8,%0\"; -#endif - } -#endif - else if (DATA_REG_P (operands[0]) - /* If N is in the right range and is even, then use - moveq #N/2, dreg; addl dreg,dreg */ - && INTVAL (operands[1]) > 127 - && INTVAL (operands[1]) <= 254 - && INTVAL (operands[1]) % 2 == 0) - { - operands[1] = gen_rtx (CONST_INT, VOIDmode, INTVAL (operands[1]) / 2); -#if defined(MOTOROLA) && !defined(CRDS) - return \"moveq%.l %1,%0\;add%.w %0,%0\"; -#else - return \"moveq %1,%0\;add%.w %0,%0\"; -#endif + return \"moveq %1,%0\;not%.b %0\"; +#endif } else if (ADDRESS_REG_P (operands[0]) && INTVAL (operands[1]) < 0x8000 |