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This patch adds support for the NEON ISA, including RTL patterns which can be used for autovectorization (some current features may not yet be supported, however), and a (large) set of intrinsics. The latter are provided via an auto-generated header file, "arm_neon.h", which should provide the same capabilities as the header file of the same name supplied with ARM's proprietary compiler tools.
Ok, except a couple of tweaks, and if you haven't already done so you need to get a c++ maintainer to sign off on the new target hook.
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