[PATCH V2] Aarch32/64: Support __FLT_EVAL_METHOD__ values other than 0, 1, 2

[Andrea Corallo]

Torbjorn SVENSSON <torbjorn.svensson@st.com> writes:

> Hello,
>
> It would have been easier to review the patch if it was inline, but
> this will have to do anyway.

Hi Torbjorn,

sorry most mail readers easily show inline attacchaments of type
"text/plain" allowing for inline reply, at the same time this way they
can still retain the notion of attached file.  This is how I rutinary
sent my patches to other GNU projects (including GCC) so far.  Has
newlib some specific rule around this?

> I think there is a typo in math.h. Aren't you supposed to do "#ifndef" and not "#ifdef"?

I guess we are talking about this hunk?

 #ifdef __epiphany__
diff --git a/newlib/libc/include/math.h b/newlib/libc/include/math.h
index ba1a8a17e..da056b5b6 100644
--- a/newlib/libc/include/math.h
+++ b/newlib/libc/include/math.h
@@ -158,6 +158,15 @@ extern int isnan (double);
    #else
     /* Implementation-defined.  Assume float_t and double_t have been
      * defined previously for this configuration (e.g. config.h). */
+
+   /* If __DOUBLE_TYPE is defined (__FLOAT_TYPE is then supposed to be
+      defined as well) float_t and double_t definition is suggested by
+      an arch specific header.  */
+   #ifdef __DOUBLE_TYPE
+    typedef __DOUBLE_TYPE double_t;
+    typedef __FLOAT_TYPE float_t;
+   #endif
+   /* Assume config.h has provided these types.  */
   #endif
 #else
     /* Assume basic definitions.  */

I believe the #ifdef is correct.  As the comment suggests if
__DOUBLE_TYPE is defined we'll use it to define double_t otherwise we
assume is config.h has provided the type definition.

I'm reattaching the latest version of this patch with a typo fixed.

Thanks!

  Andrea

-------------- next part --------------
>From d4c7eab60765bc51b97915744a5fec17b9499400 Mon Sep 17 00:00:00 2001
From: Andrea Corallo <andrea.corallo@arm.com>
Date: Wed, 30 Mar 2022 15:40:59 +0200
Subject: [PATCH] [PATH] Aarch32/64: Support __FLT_EVAL_METHOD__ values other
 than 0, 1, 2

2022-03-30  Andrea Corallo  <andrea.corallo@arm.com>

	* libc/include/machine/ieeefp.h (__FLOAT_TYPE, __DOUBLE_TYPE): New
	macros.
	* libc/include/math.h: Uses __DOUBLE_TYPE __FLOAT_TYPE to define
	double_t float_t if possible.
---
 newlib/libc/include/machine/ieeefp.h | 4 ++++
 newlib/libc/include/math.h           | 9 +++++++++
 2 files changed, 13 insertions(+)

diff --git a/newlib/libc/include/machine/ieeefp.h b/newlib/libc/include/machine/ieeefp.h
index 4dc13828c..c65c67769 100644
--- a/newlib/libc/include/machine/ieeefp.h
+++ b/newlib/libc/include/machine/ieeefp.h
@@ -90,6 +90,8 @@
 #ifndef __SOFTFP__
 # define _SUPPORTS_ERREXCEPT
 #endif
+#define __DOUBLE_TYPE double
+#define __FLOAT_TYPE float
 #endif
 
 #if defined (__aarch64__)
@@ -102,6 +104,8 @@
 #ifdef __ARM_FP
 # define _SUPPORTS_ERREXCEPT
 #endif
+#define __DOUBLE_TYPE double
+#define __FLOAT_TYPE float
 #endif
 
 #ifdef __epiphany__
diff --git a/newlib/libc/include/math.h b/newlib/libc/include/math.h
index ba1a8a17e..af5b5e653 100644
--- a/newlib/libc/include/math.h
+++ b/newlib/libc/include/math.h
@@ -158,6 +158,15 @@ extern int isnan (double);
    #else
     /* Implementation-defined.  Assume float_t and double_t have been
      * defined previously for this configuration (e.g. config.h). */
+
+   /* If __DOUBLE_TYPE is defined (__FLOAT_TYPE is then supposed to be
+      defined as well) float_t and double_t definition is suggested by
+      an arch specific header.  */
+   #ifdef __DOUBLE_TYPE
+    typedef __DOUBLE_TYPE double_t;
+    typedef __FLOAT_TYPE float_t;
+   #endif
+   /* Assume config.h has provided these types.  */
   #endif
 #else
     /* Assume basic definitions.  */
-- 
2.25.1