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| author | Adam Nemet <anemet@caviumnetworks.com> | 2006-04-03 18:12:15 +0000 |
|---|---|---|
| committer | Adam Nemet <nemet@gcc.gnu.org> | 2006-04-03 18:12:15 +0000 |
| commit | 2332d585583c1fd02f11346fcbd466b1c60d4501 (patch) | |
| tree | 021ce578c76b004900ccfc68b913f823be3d27d9 | |
| parent | cbc75e6222900e5247774843699eea0c41c41cc8 (diff) | |
| download | gcc-2332d585583c1fd02f11346fcbd466b1c60d4501.zip gcc-2332d585583c1fd02f11346fcbd466b1c60d4501.tar.gz gcc-2332d585583c1fd02f11346fcbd466b1c60d4501.tar.bz2 | |
simplify-rtx.c (simplify_unary_operation_1): When trying to remove TRUNCATE check if all bits outside the new mode are...
* 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
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/simplify-rtx.c | 3 |
2 files changed, 8 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index b264035..d157632 100644 --- a/gcc/ChangeLog +++ b/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 diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index cac77ad..0ce033d 100644 --- a/gcc/simplify-rtx.c +++ b/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)) |