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| author | Richard Sandiford <richard.sandiford@arm.com> | 2024-06-18 12:22:30 +0100 |
|---|---|---|
| committer | Richard Sandiford <richard.sandiford@arm.com> | 2024-06-18 12:22:30 +0100 |
| commit | 01044471ea39f9be4803c583ef2a946abc657f99 (patch) | |
| tree | b2c5bb1b42b78b8ee974a106929e8a8adbc4a86a /gcc | |
| parent | c9b96a68860bfdee49d40b4a844af7c5ef69cd12 (diff) | |
| download | gcc-01044471ea39f9be4803c583ef2a946abc657f99.zip gcc-01044471ea39f9be4803c583ef2a946abc657f99.tar.gz gcc-01044471ea39f9be4803c583ef2a946abc657f99.tar.bz2 | |
Make force_subreg emit nothing on failure
While adding more uses of force_subreg, I realised that it should
be more careful to emit no instructions on failure. This kind of
failure should be very rare, so I don't think it's a case worth
optimising for.
gcc/
* explow.cc (force_subreg): Emit no instructions on failure.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/explow.cc | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/gcc/explow.cc b/gcc/explow.cc index f684339..bd93c87 100644 --- a/gcc/explow.cc +++ b/gcc/explow.cc @@ -756,8 +756,12 @@ force_subreg (machine_mode outermode, rtx op, if (x) return x; + auto *start = get_last_insn (); op = copy_to_mode_reg (innermode, op); - return simplify_gen_subreg (outermode, op, innermode, byte); + rtx res = simplify_gen_subreg (outermode, op, innermode, byte); + if (!res) + delete_insns_since (start); + return res; } /* If X is a memory ref, copy its contents to a new temp reg and return |