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(force_to_mode): Sign-extend constant being truncated. 

From-SVN: r5654
This commit is contained in:
Richard Kenner 1993-10-07 08:14:16 -04:00
parent 7be2640ddb
commit ceb7983c7c
1 changed files with 12 additions and 1 deletions
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13
gcc/combine.c
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@ -5614,7 +5614,18 @@ force_to_mode (x, mode, mask, reg)
/* If X is a CONST_INT, return a new one. Do this here since the
test below will fail. */
if (GET_CODE (x) == CONST_INT)
return GEN_INT (INTVAL (x) & mask);
{
HOST_WIDE_INT cval = INTVAL (x) & mask;
int width = GET_MODE_BITSIZE (mode);
/* If MODE is narrower that HOST_WIDE_INT and CVAL is a negative
number, sign extend it. */
if (width > 0 && width < HOST_BITS_PER_WIDE_INT
&& (cval & ((HOST_WIDE_INT) 1 << (width - 1))) != 0)
cval |= (HOST_WIDE_INT) -1 << width;
return GEN_INT (cval);
}
/* If X is narrower than MODE, just get X in the proper mode. */
if (GET_MODE_SIZE (GET_MODE (x)) < GET_MODE_SIZE (mode))