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| author | Paulo Matos <pmatos@broadcom.com> | 2013-11-30 11:13:07 +0000 |
|---|---|---|
| committer | Eric Botcazou <ebotcazou@gcc.gnu.org> | 2013-11-30 11:13:07 +0000 |
| commit | 67aca9dfae0e68af581a7e43332d49a9fdf498c5 (patch) | |
| tree | 6bc23f98d78296461a08329d8739d6513cb9b8a6 /gcc/combine.c | |
| parent | 483b0aa49b3fc3f981f5bf33a88d100783ee2ed9 (diff) | |
| download | gcc-67aca9dfae0e68af581a7e43332d49a9fdf498c5.zip gcc-67aca9dfae0e68af581a7e43332d49a9fdf498c5.tar.gz gcc-67aca9dfae0e68af581a7e43332d49a9fdf498c5.tar.bz2 | |
combine.c (reg_nonzero_bits_for_combine): Apply mask transformation as applied to nonzero_sign_valid when...
* combine.c (reg_nonzero_bits_for_combine): Apply mask transformation
as applied to nonzero_sign_valid when last_set_mode has less precision
than mode.
Co-Authored-By: Eric Botcazou <ebotcazou@adacore.com>
From-SVN: r205550
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index d685a7f..25cf273 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -9472,7 +9472,13 @@ reg_nonzero_bits_for_combine (const_rtx x, enum machine_mode mode, (DF_LR_IN (ENTRY_BLOCK_PTR_FOR_FN (cfun)->next_bb), REGNO (x))))) { - *nonzero &= rsp->last_set_nonzero_bits; + unsigned HOST_WIDE_INT mask = rsp->last_set_nonzero_bits; + + if (GET_MODE_PRECISION (rsp->last_set_mode) < GET_MODE_PRECISION (mode)) + /* We don't know anything about the upper bits. */ + mask |= GET_MODE_MASK (mode) ^ GET_MODE_MASK (rsp->last_set_mode); + + *nonzero &= mask; return NULL; } @@ -9505,6 +9511,7 @@ reg_nonzero_bits_for_combine (const_rtx x, enum machine_mode mode, if (GET_MODE_PRECISION (GET_MODE (x)) < GET_MODE_PRECISION (mode)) /* We don't know anything about the upper bits. */ mask |= GET_MODE_MASK (mode) ^ GET_MODE_MASK (GET_MODE (x)); + *nonzero &= mask; } |