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newlib: Add upstream patches for float support
Bring in upstream support for newer float standards being used by GCC. Fixes #1957 Signed-off-by: Chris Packham <judge.packham@gmail.com>
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Chris Packham
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50
packages/newlib/4.1.0/0002-minimal-support-for-ts-18661-3.patch
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packages/newlib/4.1.0/0002-minimal-support-for-ts-18661-3.patch
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From 91f99d323b39dc0c06c40038791db9861d4b76b9 Mon Sep 17 00:00:00 2001
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From: Kito Cheng <kito.cheng@sifive.com>
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Date: Mon, 12 Jul 2021 17:17:21 +0800
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Subject: [PATCH] Minimal support for ISO/IEC TS 18661-3.
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- GCC will set __FLT_EVAL_METHOD__ to 16 if __fp16 supported, e.g.
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cortex-a55/aarch64.
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- $ aarch64-unknown-elf-gcc -v 2>&1 |grep version
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gcc version 9.2.0 (GCC)
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- $ aarch64-unknown-elf-gcc -E -dM -mcpu=cortex-a55 - < /dev/null |grep FLT_EVAL_METHOD
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#define __FLT_EVAL_METHOD__ 16
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#define __FLT_EVAL_METHOD_TS_18661_3__ 16
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#define __FLT_EVAL_METHOD_C99__ 16
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- The behavior of __FLT_EVAL_METHOD__ == 16 is same as
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__FLT_EVAL_METHOD__ == 0 except for float16_t, but newlib didn't
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support float16_t.
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ISO/IEC TS 18661-3:
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http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2405.pdf
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V2 Changes:
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- List Howland, Craig D as co-author since he provide the draft of comment
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in math.h.
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Co-authored-by: "Howland, Craig D" <howland@LGSInnovations.com>
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---
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newlib/libc/include/math.h | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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--- a/newlib/libc/include/math.h
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+++ b/newlib/libc/include/math.h
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@@ -146,7 +146,17 @@
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#define __TMP_FLT_EVAL_METHOD
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#endif /* FLT_EVAL_METHOD */
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#if defined FLT_EVAL_METHOD
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- #if FLT_EVAL_METHOD == 0
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+/* FLT_EVAL_METHOD == 16 has meaning as defined in ISO/IEC TS 18661-3,
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+ * which provides non-compliant extensions to C and POSIX (by adding
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+ * additional positive values for FLT_EVAL_METHOD). It effectively has
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+ * same meaning as the C99 and C11 definitions for value 0, while also
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+ * serving as a flag that the _Float16 (float16_t) type exists.
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+ *
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+ * FLT_EVAL_METHOD could be any number of bits of supported floating point
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+ * format (e.g. 32, 64, 128), but currently only AArch64 and few other targets
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+ * might define that as 16. */
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+ #if (FLT_EVAL_METHOD == 0) \
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+ || (FLT_EVAL_METHOD == 16)
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typedef float float_t;
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typedef double double_t;
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#elif FLT_EVAL_METHOD == 1
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65
packages/newlib/4.1.0/0003-support-__FLT_EVAL_METHOD__-values.patch
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packages/newlib/4.1.0/0003-support-__FLT_EVAL_METHOD__-values.patch
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From 27f0913c17c216548b2f5eea79037ee90038f375 Mon Sep 17 00:00:00 2001
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From: Andrea Corallo <andrea.corallo@arm.com>
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Date: Wed, 30 Mar 2022 15:40:59 +0200
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Subject: [PATCH] Aarch32/64: Support __FLT_EVAL_METHOD__ values other than 0,
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1, 2
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2022-03-30 Andrea Corallo <andrea.corallo@arm.com>
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* libc/include/machine/ieeefp.h (__FLOAT_TYPE, __DOUBLE_TYPE): New
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macros.
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* libc/include/math.h: Uses __DOUBLE_TYPE __FLOAT_TYPE to define
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double_t float_t if possible.
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---
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newlib/libc/include/machine/ieeefp.h | 14 ++++++++++++++
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newlib/libc/include/math.h | 9 +++++++++
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2 files changed, 23 insertions(+)
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--- a/newlib/libc/include/machine/ieeefp.h
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+++ b/newlib/libc/include/machine/ieeefp.h
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@@ -90,6 +90,13 @@
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#ifndef __SOFTFP__
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# define _SUPPORTS_ERREXCEPT
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#endif
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+/* As per ISO/IEC TS 18661 '__FLT_EVAL_METHOD__' will be defined to 16
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+ (if compiling with +fp16 support) so it can't be used by math.h to
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+ define float_t and double_t. For values of '__FLT_EVAL_METHOD__'
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+ other than 0, 1, 2 the definition of float_t and double_t is
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+ implementation-defined. */
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+#define __DOUBLE_TYPE double
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+#define __FLOAT_TYPE float
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#endif
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#if defined (__aarch64__)
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@@ -102,6 +109,13 @@
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#ifdef __ARM_FP
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# define _SUPPORTS_ERREXCEPT
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#endif
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+/* As per ISO/IEC TS 18661 '__FLT_EVAL_METHOD__' will be defined to 16
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+ (if compiling with +fp16 support) so it can't be used by math.h to
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+ define float_t and double_t. For values of '__FLT_EVAL_METHOD__'
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+ other than 0, 1, 2 the definition of float_t and double_t is
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+ implementation-defined. */
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+#define __DOUBLE_TYPE double
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+#define __FLOAT_TYPE float
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#endif
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#ifdef __epiphany__
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--- a/newlib/libc/include/math.h
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+++ b/newlib/libc/include/math.h
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@@ -168,6 +168,15 @@
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#else
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/* Implementation-defined. Assume float_t and double_t have been
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* defined previously for this configuration (e.g. config.h). */
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+
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+ /* If __DOUBLE_TYPE is defined (__FLOAT_TYPE is then supposed to be
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+ defined as well) float_t and double_t definition is suggested by
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+ an arch specific header. */
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+ #ifdef __DOUBLE_TYPE
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+ typedef __DOUBLE_TYPE double_t;
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+ typedef __FLOAT_TYPE float_t;
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+ #endif
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+ /* Assume config.h has provided these types. */
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#endif
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#else
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/* Assume basic definitions. */
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