use _Float16 only when SSE2 is enabled

Forwarded: https://codereview.qt-project.org/c/qt/qtbase/+/579205
Last-Update: 2024-08-01

The GCC documentation [1] says: “On x86 targets with SSE2 enabled, GCC
supports half-precision (16-bit) floating point via the _Float16 type”.

On non-SSE2 x86 (such as Debian i386 baseline [2]), __FLT16_MAX__ is
defined starting with GCC 14 [3], however any non-trivial use of the
_Float16 type results in an error:

error: operation not permitted on type ‘_Float16’ without option ‘-msse2’

which makes some packages fail to build on i386 architecture [4].

[1]: https://gcc.gnu.org/onlinedocs/gcc/Half-Precision.html
[2]: https://wiki.debian.org/ArchitectureSpecificsMemo#i386-1
[3]: https://gcc.gnu.org/g:9a19fa8b616f83474c35cc5b34a3865073ced829
[4]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1076986

Gbp-Pq: Name use_float16_only_with_sse2.patch

diff --git a/src/corelib/global/qtypes.h b/src/corelib/global/qtypes.h
index db9ba38e4cfc7d5d2625655868790398f714ad1e..28458f63c20b0b86c53faa30f6fa1d7289aabff4 100644 (file)
--- a/src/corelib/global/qtypes.h
+++ b/src/corelib/global/qtypes.h
@@ -263,13 +263,12 @@ using NativeFloat16Type = std::float16_t;
 // disabled due to https://github.com/llvm/llvm-project/issues/56963
 #  define QFLOAT16_IS_NATIVE        1
 using NativeFloat16Type = decltype(__FLT16_MAX__);
-#elif defined(Q_CC_GNU_ONLY) && defined(__FLT16_MAX__)
+#elif defined(Q_CC_GNU_ONLY) && defined(__FLT16_MAX__) && defined(__ARM_FP16_FORMAT_IEEE)
 #  define QFLOAT16_IS_NATIVE        1
-#  ifdef __ARM_FP16_FORMAT_IEEE
 using NativeFloat16Type = __fp16;
-#  else
+#elif defined(Q_CC_GNU_ONLY) && defined(__FLT16_MAX__) && defined(__SSE2__)
+#  define QFLOAT16_IS_NATIVE        1
 using NativeFloat16Type = _Float16;
-#  endif
 #else
 #  define QFLOAT16_IS_NATIVE        0
 using NativeFloat16Type = void;