On Thu, Feb 24, 2011 at 2:34 AM, Christian ANDERSSON2 <christian.c.anders...@stericsson.com> wrote: > Hello Linaro toolchain guys, > > > > I have a few questions regarding GCC fully supporting the ARM Cortex M4, > > I’m especially thinking of the additional DSP instructions and if these are > supported and how optimal the code being produced is?
Hi Christian. Sorry for the delay in replying. The Cortex-M4 has quite a few DSP instructions and I'm afraid we don't have a coverage report on them. Here's what we do have: * A Cortex-M4 pipeline description, and FPU description * Good support for Thumb-2 * The cast instructions including UXTH, UXTB, UXTAH, and signed versions * 16x16 -> 32 multiply-and-accumulate instructions SMLABB * 16x16 -> 64 multiply-and-accumulate SMLALBB * 16x16 -> 32 multiply SMULBB, SMULTBB There's no support for the ARMv5 saturation instructions or the ARMv6 core register based vector instructions such as UQADD8, but we're looking into them: https://blueprints.launchpad.net/gcc-linaro/+spec/armv5-saturated-ops https://blueprints.launchpad.net/gcc-linaro/+spec/armv6-simd Note that we're working on Cortex-A focused performance. We're not working on the Cortex-M, but many of the generic Thumb-2 improvements should also improve things on the M4. Hope that helps, -- Michael _______________________________________________ linaro-toolchain mailing list linaro-toolchain@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-toolchain
