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From-SVN: r1477
This commit is contained in:
Charles Hannum 1992-07-06 20:21:37 +00:00
parent c166a31116
commit 82a5e8985c
1 changed files with 9 additions and 7 deletions
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16
gcc/cse.c
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@ -2895,7 +2895,7 @@ simplify_unary_operation (code, mode, op, op_mode)
case ZERO_EXTEND:
if (op_mode == VOIDmode)
op_mode = mode;
if (GET_MODE_BITSIZE (op_mode) == HOST_BITS_PER_INT)
if (GET_MODE_BITSIZE (op_mode) == HOST_BITS_PER_WIDE_INT)
{
/* If we were really extending the mode,
we would have to distinguish between zero-extension
@ -2904,8 +2904,8 @@ simplify_unary_operation (code, mode, op, op_mode)
abort ();
val = arg0;
}
else if (GET_MODE_BITSIZE (op_mode) < HOST_BITS_PER_INT)
val = arg0 & ~((-1) << GET_MODE_BITSIZE (op_mode));
else if (GET_MODE_BITSIZE (op_mode) < HOST_BITS_PER_WIDE_INT)
val = arg0 & ~((HOST_WIDE_INT) (-1) << GET_MODE_BITSIZE (op_mode));
else
return 0;
break;
@ -2913,7 +2913,7 @@ simplify_unary_operation (code, mode, op, op_mode)
case SIGN_EXTEND:
if (op_mode == VOIDmode)
op_mode = mode;
if (GET_MODE_BITSIZE (op_mode) == HOST_BITS_PER_INT)
if (GET_MODE_BITSIZE (op_mode) == HOST_BITS_PER_WIDE_INT)
{
/* If we were really extending the mode,
we would have to distinguish between zero-extension
@ -2924,9 +2924,11 @@ simplify_unary_operation (code, mode, op, op_mode)
}
else if (GET_MODE_BITSIZE (op_mode) < HOST_BITS_PER_INT)
{
val = arg0 & ~((-1) << GET_MODE_BITSIZE (op_mode));
if (val & (1 << (GET_MODE_BITSIZE (op_mode) - 1)))
val -= 1 << GET_MODE_BITSIZE (op_mode);
val
= arg0 & ~((HOST_WIDE_INT) (-1) << GET_MODE_BITSIZE (op_mode));
if (val
& ((HOST_WIDE_INT) 1 << (GET_MODE_BITSIZE (op_mode) - 1)))
val -= (HOST_WIDE_INT) 1 << GET_MODE_BITSIZE (op_mode);
}
else
return 0;