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m68k.c (output_move_simode_const): Use subl to move a zero into an address register.

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* m68k.c (output_move_simode_const): Use subl to move a zero into an
        address register.
        (output_move_[hq]imode): Likewise.

From-SVN: r21778
This commit is contained in:
Andreas Schwab 1998-08-17 08:25:31 +00:00 committed by Jeff Law
parent 3f9a83a91b
commit 38198304cc
2 changed files with 14 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
Mon Aug 17 09:23:42 1998 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
* m68k.c (output_move_simode_const): Use subl to move a zero into an
address register.
(output_move_[hq]imode): Likewise.
Mon Aug 17 09:15:47 1998 Jeffrey A Law (law@cygnus.com)
* toplev.c (main): Enable -fstrict-aliasing for -O2 and above.

8
gcc/config/m68k/m68k.c
View File

@ -1507,6 +1507,9 @@ output_move_simode_const (operands)
|| !(GET_CODE (operands[0]) == MEM
&& MEM_VOLATILE_P (operands[0]))))
return "clr%.l %0";
else if (operands[1] == const0_rtx
&& ADDRESS_REG_P (operands[0]))
return "sub%.l %0,%0";
else if (DATA_REG_P (operands[0]))
return output_move_const_into_data_reg (operands);
else if (ADDRESS_REG_P (operands[0])
@ -1554,6 +1557,9 @@ output_move_himode (operands)
|| !(GET_CODE (operands[0]) == MEM
&& MEM_VOLATILE_P (operands[0]))))
return "clr%.w %0";
else if (operands[1] == const0_rtx
&& ADDRESS_REG_P (operands[0]))
return "sub%.l %0,%0";
else if (DATA_REG_P (operands[0])
&& INTVAL (operands[1]) < 128
&& INTVAL (operands[1]) >= -128)
@ -1668,6 +1674,8 @@ output_move_qimode (operands)
return "moveq %1,%0";
#endif
}
if (operands[1] == const0_rtx && ADDRESS_REG_P (operands[0]))
return "sub%.l %0,%0";
if (GET_CODE (operands[1]) != CONST_INT && CONSTANT_P (operands[1]))
return "move%.l %1,%0";
/* 68k family doesn't support byte moves to from address registers. The