diff options
| author | Richard Sandiford <richard.sandiford@linaro.org> | 2017-10-13 09:23:54 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2017-10-13 09:23:54 +0000 |
| commit | 610c45fcbfff43176beefefcea74c6137a432220 (patch) | |
| tree | fc56c08135f71cfb00cb65322910c3e569682d8e /gcc/regcprop.c | |
| parent | 5752d1f7943db65667edeaf8481dc10b60a23197 (diff) | |
Make more use of subreg_lowpart_offset
This patch uses subreg_lowpart_offset in places that open-coded
the calculation. It also uses it in regcprop.c to test whether,
after a mode change, the first register in a multi-register group
is still the right one.
2017-10-13 Richard Sandiford <richard.sandiford@linaro.org>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@arm.com>
gcc/
* calls.c (expand_call): Use subreg_lowpart_offset.
* cse.c (cse_insn): Likewise.
* regcprop.c (copy_value): Likewise.
(copyprop_hardreg_forward_1): Likewise.
Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>
From-SVN: r253713
Diffstat (limited to 'gcc/regcprop.c')
| -rw-r--r-- | gcc/regcprop.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/gcc/regcprop.c b/gcc/regcprop.c index 73e945d45ae..5db5b5d9fdf 100644 --- a/gcc/regcprop.c +++ b/gcc/regcprop.c @@ -345,8 +345,7 @@ copy_value (rtx dest, rtx src, struct value_data *vd) We can't properly represent the latter case in our tables, so don't record anything then. */ else if (sn < hard_regno_nregs (sr, vd->e[sr].mode) - && (GET_MODE_SIZE (vd->e[sr].mode) > UNITS_PER_WORD - ? WORDS_BIG_ENDIAN : BYTES_BIG_ENDIAN)) + && subreg_lowpart_offset (GET_MODE (dest), vd->e[sr].mode) != 0) return; /* If SRC had been assigned a mode narrower than the copy, we can't @@ -871,8 +870,7 @@ copyprop_hardreg_forward_1 (basic_block bb, struct value_data *vd) /* And likewise, if we are narrowing on big endian the transformation is also invalid. */ if (REG_NREGS (src) < hard_regno_nregs (regno, vd->e[regno].mode) - && (GET_MODE_SIZE (vd->e[regno].mode) > UNITS_PER_WORD - ? WORDS_BIG_ENDIAN : BYTES_BIG_ENDIAN)) + && subreg_lowpart_offset (mode, vd->e[regno].mode) != 0) goto no_move_special_case; } |