From: Segher Boessenkool <segher@kernel.crashing.org>
To: Xionghu Luo <luoxhu@linux.ibm.com>
Cc: will schmidt <will_schmidt@vnet.ibm.com>,
gcc-patches@gcc.gnu.org, wschmidt@linux.ibm.com,
dje.gcc@gmail.com, linkw@gcc.gnu.org
Subject: Re: Ping ^ 2: [PATCH] rs6000: Expand fmod and remainder when built with fast-math [PR97142]
Date: Fri, 3 Sep 2021 16:44:54 -0500 [thread overview]
Message-ID: <20210903214454.GO1583@gate.crashing.org> (raw)
In-Reply-To: <bb0d643d-9562-c53c-37da-9a110af421d1@linux.ibm.com>
Hi!
On Fri, Sep 03, 2021 at 10:31:24AM +0800, Xionghu Luo wrote:
> fmod/fmodf and remainder/remainderf could be expanded instead of library
> call when fast-math build, which is much faster.
Thank you very much for this patch.
Some trivial comments if you haven't commmitted it yet:
> +(define_expand "fmod<mode>3"
> + [(use (match_operand:SFDF 0 "gpc_reg_operand"))
> + (use (match_operand:SFDF 1 "gpc_reg_operand"))
> + (use (match_operand:SFDF 2 "gpc_reg_operand"))]
> + "TARGET_HARD_FLOAT
> + && TARGET_FPRND
> + && flag_unsafe_math_optimizations"
It should have one extra space before each && here:
"TARGET_HARD_FLOAT
&& TARGET_FPRND
&& flag_unsafe_math_optimizations"
(so that everything inside of the string aligns).
> +(define_expand "remainder<mode>3"
(same here).
> +/* { dg-final { scan-assembler-not {\mbl fmod\M} } } */
> +/* { dg-final { scan-assembler-not {\mbl fmodf\M} } } */
> +/* { dg-final { scan-assembler-not {\mbl remainder\M} } } */
> +/* { dg-final { scan-assembler-not {\mbl remainderf\M} } } */
These are negative tests, so won't spuriously fail, but this does not
test for the function prefixes we can have. See
gcc.target/powerpc/builtins-1.c for example.
Again, thank you, and thanks to everyone else for the patch review
action :-)
Segher
next prev parent reply other threads:[~2021-09-03 21:45 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-16 7:10 Xiong Hu Luo
2021-05-06 2:36 ` Ping: " Xionghu Luo
2021-05-14 7:13 ` Xionghu Luo
2021-06-07 5:08 ` Ping^2: " Xionghu Luo
2021-06-30 1:44 ` Ping ^ 2: " Xionghu Luo
2021-07-09 18:40 ` will schmidt
2021-07-12 1:25 ` Xionghu Luo
2021-09-03 2:31 ` Xionghu Luo
2021-09-03 14:51 ` Bill Schmidt
2021-09-03 14:53 ` David Edelsohn
2021-09-03 21:44 ` Segher Boessenkool [this message]
2021-09-06 8:59 ` Xionghu Luo
2021-09-06 21:57 ` Segher Boessenkool
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