From: Jeff Law <jeffreyalaw@gmail.com>
To: Segher Boessenkool <segher@kernel.crashing.org>
Cc: liuhongt <hongtao.liu@intel.com>,
jakub@redhat.com, richard.sandiford@arm.com,
gcc-patches@gcc.gnu.org
Subject: Re: [PATCH 1/2] CALL_INSN may not be a real function call.
Date: Wed, 7 Jul 2021 11:56:55 -0600 [thread overview]
Message-ID: <c586748b-42dd-36ae-4481-014049624a6c@gmail.com> (raw)
In-Reply-To: <20210707145517.GM1583@gate.crashing.org>
On 7/7/2021 8:55 AM, Segher Boessenkool wrote:
> On Mon, Jul 05, 2021 at 06:03:21PM -0600, Jeff Law wrote:
>> It reminds me a bit of millicode calls on the PA or calls to special
>> routines in libgcc. They're calls to functions, but those functions do
>> not follow the standard ABI.
> Something with CALL_INSN_FUNCTION_USAGE? And maybe some clobbers?
I don't remember all the details on the PA side and the decision to
express mul, div, mod as regular insns pre-dates my involvement in the
PA port (hard to believe, but true). I'd hazard a guess the goal behind
making them regular insns was to not inhibit leaf function detection,
avoid caller-saves around the "calls" and such. CALL_INSN_FUNCTION_USAGE
didn't exist until the mid 90s. I wouldn't be surprised if we could
migrate the millicode calls to the CALL_INSN_FUNCTION_USAGE model.
jeff
next prev parent reply other threads:[~2021-07-07 17:57 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-13 9:23 [PATCH] [i386] Fix _mm256_zeroupper to notify LRA that vzeroupper will kill sse registers. [PR target/82735] Hongtao Liu
2021-05-13 9:40 ` Uros Bizjak
2021-05-13 9:43 ` Uros Bizjak
2021-05-13 9:54 ` Jakub Jelinek
2021-05-13 11:32 ` Richard Sandiford
2021-05-13 11:37 ` Jakub Jelinek
2021-05-13 11:52 ` Richard Sandiford
2021-05-14 2:27 ` Hongtao Liu
2021-05-17 8:44 ` Hongtao Liu
2021-05-17 9:56 ` Richard Sandiford
2021-05-18 13:12 ` Hongtao Liu
2021-05-18 15:18 ` Richard Sandiford
2021-05-25 6:04 ` Hongtao Liu
2021-05-25 6:30 ` Hongtao Liu
2021-05-27 5:07 ` Hongtao Liu
2021-05-27 7:05 ` Uros Bizjak
2021-06-01 2:24 ` Hongtao Liu
2021-06-03 6:54 ` [PATCH 1/2] CALL_INSN may not be a real function call liuhongt
2021-06-03 6:54 ` [PATCH 2/2] Fix _mm256_zeroupper by representing the instructions as call_insns in which the call has a special vzeroupper ABI liuhongt
2021-06-04 2:56 ` Hongtao Liu
2021-06-04 6:26 ` Uros Bizjak
2021-06-04 6:34 ` Hongtao Liu
2021-06-07 19:04 ` [PATCH] x86: Don't compile pr82735-[345].c for x32 H.J. Lu
2021-06-04 2:55 ` [PATCH 1/2] CALL_INSN may not be a real function call Hongtao Liu
2021-06-04 7:50 ` Jakub Jelinek
2021-07-05 23:30 ` Segher Boessenkool
2021-07-06 0:03 ` Jeff Law
2021-07-06 1:49 ` Hongtao Liu
2021-07-07 14:55 ` Segher Boessenkool
2021-07-07 17:56 ` Jeff Law [this message]
2021-07-06 1:37 ` Hongtao Liu
2021-07-07 2:44 ` Hongtao Liu
2021-07-07 8:15 ` Richard Biener
2021-07-07 14:52 ` Segher Boessenkool
2021-07-07 15:23 ` Hongtao Liu
2021-07-07 23:42 ` Segher Boessenkool
2021-07-08 4:14 ` Hongtao Liu
2021-07-07 15:32 ` Hongtao Liu
2021-07-07 23:54 ` Segher Boessenkool
2021-07-09 7:20 ` Hongtao Liu
2021-07-07 15:52 ` Hongtao Liu
2021-05-27 7:20 ` [PATCH] [i386] Fix _mm256_zeroupper to notify LRA that vzeroupper will kill sse registers. [PR target/82735] Jakub Jelinek
2021-05-27 10:50 ` Richard Sandiford
2021-06-01 2:22 ` Hongtao Liu
2021-06-01 2:25 ` Hongtao Liu
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