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| author | Jeffrey A Law <law@cygnus.com> | 1999-09-02 09:02:33 +0000 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 1999-09-02 03:02:33 -0600 |
| commit | e6380233ffeef512f5db01c0543a37e68c61cb90 (patch) | |
| tree | 0785d8c746f37a1f8ab7349ae33e718925c05cd1 /gcc/combine.c | |
| parent | 08e105064ff2af90818c04eeeeef5de9203733a8 (diff) | |
| download | gcc-e6380233ffeef512f5db01c0543a37e68c61cb90.zip gcc-e6380233ffeef512f5db01c0543a37e68c61cb90.tar.gz gcc-e6380233ffeef512f5db01c0543a37e68c61cb90.tar.bz2 | |
combine.c (simplify_rtx): Recognize another case of a synthesized sign extension.
* combine.c (simplify_rtx): Recognize another case of a synthesized
sign extension.
From-SVN: r29055
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 6886ba7..01703ba 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -3913,12 +3913,14 @@ simplify_rtx (x, op0_mode, last, in_dest) /* (plus (xor (and <foo> (const_int pow2 - 1)) <c>) <-c>) when c is (const_int (pow2 + 1) / 2) is a sign extension of a bit-field and can be replaced by either a sign_extend or a - sign_extract. The `and' may be a zero_extend. */ + sign_extract. The `and' may be a zero_extend and the two + <c>, -<c> constants may be reversed. */ if (GET_CODE (XEXP (x, 0)) == XOR && GET_CODE (XEXP (x, 1)) == CONST_INT && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT && INTVAL (XEXP (x, 1)) == - INTVAL (XEXP (XEXP (x, 0), 1)) - && (i = exact_log2 (INTVAL (XEXP (XEXP (x, 0), 1)))) >= 0 + && ((i = exact_log2 (INTVAL (XEXP (XEXP (x, 0), 1)))) >= 0 + || (i = exact_log2 (INTVAL (XEXP (x, 1)))) >= 0) && GET_MODE_BITSIZE (mode) <= HOST_BITS_PER_WIDE_INT && ((GET_CODE (XEXP (XEXP (x, 0), 0)) == AND && GET_CODE (XEXP (XEXP (XEXP (x, 0), 0), 1)) == CONST_INT |