commit a1a81cc2acfd4f06c04197518c0195e3bdc7f5b2
author Gabor Kertesz <gabor.kertesz@linaro.org> Mon Oct 25 12:03:42 2021 +0200
committer Cosmin Truta <ctruta@gmail.com> Tue Sep 13 01:23:52 2022 +0300
tree 87336b9044f51b3cb97e646f988f6f5652e7ebb6
parent c3a1d8424c16c35f377861b968765d4db154e859

Fix arm neon config for win-arm64 with MSVC

Fixes #398
It adds win-arm64 as an arm64 platform, by using a define which
is set to 1 for compilations that target 64-bit ARM processors,
otherwise undefined.

pngpriv.h

diff --git a/pngpriv.h b/pngpriv.h
index 583c26f..1edea74 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -174,7 +174,7 @@
 #     else /* !defined __ARM_NEON__ */
          /* The 'intrinsics' code simply won't compile without this -mfpu=neon:
           */
-#        if !defined(__aarch64__)
+#        if !defined(__aarch64__) && !defined(_M_ARM64)
             /* The assembler code currently does not work on ARM64 */
 #          define PNG_ARM_NEON_IMPLEMENTATION 2
 #        endif /* __aarch64__ */