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(alpha_emit_set_long_const): Save one instruction when -O2 and high 

word == low word.

From-SVN: r12740
This commit is contained in:
Richard Kenner 1996-09-18 17:33:30 -04:00
parent 1bfce0b8a4
commit c3741733db
1 changed files with 23 additions and 16 deletions
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39
gcc/config/alpha/alpha.c
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@ -981,7 +981,7 @@ alpha_emit_set_long_const (target, c)
= (flag_expensive_optimizations && rtx_equal_function_value_matters
? 0 : target);
HOST_WIDE_INT d1, d2, d3, d4;
rtx r;
rtx r1, r2;
/* Decompose the entire word */
d1 = ((c & 0xffff) ^ 0x8000) - 0x8000;
@ -997,29 +997,36 @@ alpha_emit_set_long_const (target, c)
/* Construct the high word */
if (d3 == 0)
r = copy_to_suggested_reg (GEN_INT (d4), subtarget, DImode);
r1 = copy_to_suggested_reg (GEN_INT (d4), subtarget, DImode);
else if (d4 == 0)
r = copy_to_suggested_reg (GEN_INT (d3), subtarget, DImode);
r1 = copy_to_suggested_reg (GEN_INT (d3), subtarget, DImode);
else
r = expand_binop (DImode, add_optab, GEN_INT (d3), GEN_INT (d4),
subtarget, 0, OPTAB_WIDEN);
r1 = expand_binop (DImode, add_optab, GEN_INT (d3), GEN_INT (d4),
subtarget, 0, OPTAB_WIDEN);
/* Shift it into place */
r = expand_binop (DImode, ashl_optab, r, GEN_INT (32),
subtarget, 0, OPTAB_WIDEN);
r2 = expand_binop (DImode, ashl_optab, r1, GEN_INT (32),
subtarget, 0, OPTAB_WIDEN);
/* Add in the low word */
if (d2 != 0)
r = expand_binop (DImode, add_optab, r, GEN_INT (d2),
subtarget, 0, OPTAB_WIDEN);
if (d1 != 0)
r = expand_binop (DImode, add_optab, r, GEN_INT (d1),
subtarget, 0, OPTAB_WIDEN);
if (subtarget == 0 && d1 == d3 && d2 == d4)
r1 = expand_binop (DImode, add_optab, r1, r2, subtarget, 0, OPTAB_WIDEN);
else
{
r1 = r2;
/* Add in the low word */
if (d2 != 0)
r1 = expand_binop (DImode, add_optab, r1, GEN_INT (d2),
subtarget, 0, OPTAB_WIDEN);
if (d1 != 0)
r1 = expand_binop (DImode, add_optab, r1, GEN_INT (d1),
subtarget, 0, OPTAB_WIDEN);
}
if (subtarget == 0)
r = copy_to_suggested_reg(r, target, DImode);
r1 = copy_to_suggested_reg(r1, target, DImode);
return r;
return r1;
}
#endif /* HOST_BITS_PER_WIDE_INT == 64 */