Hi All,
Dot Product is intended to only be available for Armv8.2-a and newer.
While this restriction is reflected in the intrinsics, the patterns
themselves were missing the Armv8.2-a bit.
While GCC would prevent invalid options e.g. `-march=armv8.1-a+dotprod`
we should prevent the pattern from being able to expand at all.
Regtested on arm-none-eabi and no issues.
Ok for trunk?
Thanks,
Tamar
gcc/
2017-11-14 Tamar Christina <tamar.christ...@arm.com>
* config/arm/arm.h (TARGET_DOTPROD): Add arm_arch8_2.
--
diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
index 9567f6df73a960ab08b3766fcf3677629658a5ab..b189951c934e327c88cc5893e9629515c9c39013 100644
--- a/gcc/config/arm/arm.h
+++ b/gcc/config/arm/arm.h
@@ -210,10 +210,11 @@ extern tree arm_fp16_type_node;
/* FPU supports ARMv8.1 Adv.SIMD extensions. */
#define TARGET_NEON_RDMA (TARGET_NEON && arm_arch8_1)
-/* Supports for Dot Product AdvSIMD extensions. */
+/* Supports the Dot Product AdvSIMD extensions. */
#define TARGET_DOTPROD (TARGET_NEON \
&& bitmap_bit_p (arm_active_target.isa, \
- isa_bit_dotprod))
+ isa_bit_dotprod) \
+ && arm_arch8_2)
/* FPU supports the floating point FP16 instructions for ARMv8.2 and later. */
#define TARGET_VFP_FP16INST \
