[PATCH PR94442] [AArch64] Redundant ldp/stp instructions emitted at -O3
Tue Aug 4 08:01:07 GMT 2020
> -----Original Message-----
> From: Richard Sandiford [mailto:firstname.lastname@example.org]
> Sent: Monday, August 3, 2020 9:55 PM
> To: xiezhiheng <email@example.com>
> Cc: Richard Biener <firstname.lastname@example.org>; email@example.com
> Subject: Re: [PATCH PR94442] [AArch64] Redundant ldp/stp instructions
> emitted at -O3
> > Sorry, I should have used it. And I prepare a patch to use FLOAT_MODE_P
> > macro and add a flag FLAG_SUPPRESS_FP_EXCEPTIONS to suppress
> > FLAG_RAISE_FP_EXCEPTIONS for certain intrinsics in future.
> The same thing is true for reading FPCR as well, so I think the flag
> should suppress the FLOAT_MODE_P check, instead of fixing up the flags
> I'm struggling to think of a good name though. How about adding
> FLAG_AUTO_FP and making the FLOAT_MODE_P check dependent on
> being set?
> We could leave FLAG_AUTO_FP out of FLAG_ALL, since FLAG_ALL already
> includes FLAG_FP. Including it in FLAG_ALL wouldn't do no any harm
I could not think of a better name either. So I choose to use FLAG_AUTO_FP
to control the check of FLOAT_MODE_P finally.
Bootstrapped and tested on aarch64 Linux platform.
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b834a2c473a..f4a44704926 100644
@@ -1,3 +1,9 @@
+2020-08-04 Zhiheng Xie <firstname.lastname@example.org>
+ * config/aarch64/aarch64-builtins.c (aarch64_call_properties):
+ Use FLOAT_MODE_P macro instead of enumerating all floating-point
+ modes and add global flag FLAG_AUTO_FP.
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