Hi,
This patch is part of a patch series to add support for ARMv8-M[1] to GCC. This
specific patch enable atomics for ARMv8-M Mainline. No change is needed to
existing patterns since Thumb-2 backend can already handle them fine.
[1] For a quick overview of ARMv8-M please refer to the initial cover letter.
ChangeLog entries are as follow:
*** gcc/ChangeLog ***
2015-12-17 Thomas Preud'homme <thomas.preudho...@arm.com>
* config/arm/arm.h (TARGET_HAVE_LDACQ): Enable for ARMv8-M Mainline.
diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
index
1f79c37b5c36a410a2d500ba92c62a5ba4ca1178..fa2a6fb03ffd2ca53bfb7e7c8f03022b626880e0
100644
--- a/gcc/config/arm/arm.h
+++ b/gcc/config/arm/arm.h
@@ -258,7 +258,7 @@ extern void (*arm_lang_output_object_attributes_hook)(void);
|| arm_arch7) && arm_arch_notm)
/* Nonzero if this chip supports load-acquire and store-release. */
-#define TARGET_HAVE_LDACQ (TARGET_ARM_ARCH >= 8 && arm_arch_notm)
+#define TARGET_HAVE_LDACQ (TARGET_ARM_ARCH >= 8 && TARGET_32BIT)
/* Nonzero if this chip provides the movw and movt instructions. */
#define TARGET_HAVE_MOVT (arm_arch_thumb2 || arm_arch8)
Testing:
* Toolchain was built successfully with and without the ARMv8-M support patches
with the following multilib list: armv6-m,armv7-m,armv7e-m,cortex-m7. The code
generation for crtbegin.o, crtend.o, crti.o, crtn.o, libgcc.a, libgcov.a,
libc.a, libg.a, libgloss-linux.a, libm.a, libnosys.a, librdimon.a, librdpmon.a,
libstdc++.a and libsupc++.a is unchanged for all these targets.
* GCC also showed no testsuite regression when targeting ARMv8-M Baseline
compared to ARMv6-M on ARM Fast Models and when targeting ARMv6-M and ARMv7-M
(compared to without the patch)
* GCC was bootstrapped successfully targeting Thumb-1 and targeting Thumb-2
Is this ok for stage3?
Best regards,
Thomas
