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Zero extend when generating a CONST_DOUBLE in convert_modes

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From-SVN: r13041
This commit is contained in:
Ian Lance Taylor 1996-10-27 02:08:23 +00:00
parent 8d998e52a0
commit 96ff8a163e
1 changed files with 14 additions and 1 deletions
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15
gcc/expr.c
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@ -1292,7 +1292,20 @@ convert_modes (mode, oldmode, x, unsignedp)
if (unsignedp && GET_MODE_CLASS (mode) == MODE_INT
&& GET_MODE_BITSIZE (mode) == 2 * HOST_BITS_PER_WIDE_INT
&& GET_CODE (x) == CONST_INT && INTVAL (x) < 0)
return immed_double_const (INTVAL (x), (HOST_WIDE_INT) 0, mode);
{
HOST_WIDE_INT val = INTVAL (x);
if (oldmode != VOIDmode
&& HOST_BITS_PER_WIDE_INT > GET_MODE_BITSIZE (oldmode))
{
int width = GET_MODE_BITSIZE (oldmode);
/* We need to zero extend VAL. */
val &= ((HOST_WIDE_INT) 1 << width) - 1;
}
return immed_double_const (val, (HOST_WIDE_INT) 0, mode);
}
/* We can do this with a gen_lowpart if both desired and current modes
are integer, and this is either a constant integer, a register, or a