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simplify-rtx.c (simplify_unary_operation_1): When trying to remove TRUNCATE check if all bits outside the new mode are...

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* simplify-rtx.c (simplify_unary_operation_1) <TRUNCATE>: When
	trying to remove TRUNCATE check if all bits outside the new mode
	are identical to the sign bit.

From-SVN: r112643
This commit is contained in:
Adam Nemet 2006-04-03 18:12:15 +00:00 committed by Adam Nemet
parent cbc75e6222
commit 2332d58558
2 changed files with 8 additions and 1 deletions

6
gcc/ChangeLog

@ -1,3 +1,9 @@
2006-04-03 Adam Nemet <anemet@caviumnetworks.com>
* simplify-rtx.c (simplify_unary_operation_1) <TRUNCATE>: When
trying to remove TRUNCATE check if all bits outside the new mode
are identical to the sign bit.
2006-04-03 Jeff Law <law@redhat.com>
* tree-ssa-dom.c (propagate_rhs_into_lhs): Avoid useless folding

3
gcc/simplify-rtx.c

@ -656,7 +656,8 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op)
if ((TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
GET_MODE_BITSIZE (GET_MODE (op)))
? (num_sign_bit_copies (op, GET_MODE (op))
>= (unsigned int) (GET_MODE_BITSIZE (mode) + 1))
> (unsigned int) (GET_MODE_BITSIZE (GET_MODE (op))
- GET_MODE_BITSIZE (mode)))
: truncated_to_mode (mode, op))
&& ! (GET_CODE (op) == LSHIFTRT
&& GET_CODE (XEXP (op, 0)) == MULT))