diff options
| author | ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4> | 2013-11-30 11:13:07 +0000 |
|---|---|---|
| committer | ebotcazou <ebotcazou@138bc75d-0d04-0410-961f-82ee72b054a4> | 2013-11-30 11:13:07 +0000 |
| commit | 8487161bceef3cc7dcb4e3f89f7f1e1de621b6c9 (patch) | |
| tree | 6bc23f98d78296461a08329d8739d6513cb9b8a6 | |
| parent | 54f1cbe958be3f49702d69ca3b5eee77ed16f0c0 (diff) | |
| download | gcc-8487161bceef3cc7dcb4e3f89f7f1e1de621b6c9.tar.gz | |
* 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.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@205550 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/combine.c | 9 |
2 files changed, 15 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 3e117263db5..ca7b3e85641 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2013-11-30 Paulo Matos <pmatos@broadcom.com> + Eric Botcazou <ebotcazou@adacore.com> + + * 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. + 2013-11-30 Tobias Burnus <burnus@net-b.de> PR sanitizer/59275 diff --git a/gcc/combine.c b/gcc/combine.c index d685a7f6a66..25cf273f808 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; } |