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| author | Robin Dapp <rdapp@linux.ibm.com> | 2019-11-27 13:45:41 +0100 |
|---|---|---|
| committer | Robin Dapp <rdapp@linux.ibm.com> | 2022-01-19 18:34:02 +0100 |
| commit | 9b8eaa282250ad260e01d164093b597579db00d9 (patch) | |
| tree | 9a60ae8b851afebcc764f83c4138dff57a959cc5 | |
| parent | 4c46f5a471c239f7d3fb37c748f1f18a8ebae1a2 (diff) | |
| download | gcc-9b8eaa282250ad260e01d164093b597579db00d9.zip gcc-9b8eaa282250ad260e01d164093b597579db00d9.tar.gz gcc-9b8eaa282250ad260e01d164093b597579db00d9.tar.bz2 | |
ifcvt: Allow constants for noce_convert_multiple.
This lifts the restriction of not allowing constants for
noce_convert_multiple. The code later checks if a valid sequence
is produced anyway.
gcc/ChangeLog:
* ifcvt.cc (noce_convert_multiple_sets): Allow constants.
(bb_ok_for_noce_convert_multiple_sets): Likewise.
| -rw-r--r-- | gcc/ifcvt.cc | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/gcc/ifcvt.cc b/gcc/ifcvt.cc index 0f7a126..c696563 100644 --- a/gcc/ifcvt.cc +++ b/gcc/ifcvt.cc @@ -3288,7 +3288,9 @@ noce_convert_multiple_sets (struct noce_if_info *if_info) we'll end up trying to emit r4:HI = cond ? (r1:SI) : (r3:HI). Wrap the two cmove operands into subregs if appropriate to prevent that. */ - if (GET_MODE (new_val) != GET_MODE (temp)) + + if (!CONSTANT_P (new_val) + && GET_MODE (new_val) != GET_MODE (temp)) { machine_mode src_mode = GET_MODE (new_val); machine_mode dst_mode = GET_MODE (temp); @@ -3299,7 +3301,8 @@ noce_convert_multiple_sets (struct noce_if_info *if_info) } new_val = lowpart_subreg (dst_mode, new_val, src_mode); } - if (GET_MODE (old_val) != GET_MODE (temp)) + if (!CONSTANT_P (old_val) + && GET_MODE (old_val) != GET_MODE (temp)) { machine_mode src_mode = GET_MODE (old_val); machine_mode dst_mode = GET_MODE (temp); @@ -3441,9 +3444,9 @@ bb_ok_for_noce_convert_multiple_sets (basic_block test_bb) if (!REG_P (dest)) return false; - if (!(REG_P (src) - || (GET_CODE (src) == SUBREG && REG_P (SUBREG_REG (src)) - && subreg_lowpart_p (src)))) + if (!((REG_P (src) || CONSTANT_P (src)) + || (GET_CODE (src) == SUBREG && REG_P (SUBREG_REG (src)) + && subreg_lowpart_p (src)))) return false; /* Destination must be appropriate for a conditional write. */ |