Re: ARM: VFPv3-D16 vs. VFPv3-D32
Which Cortex-R you are targeting that supports both D16 and D32? Thanks, Joey On Thu, Oct 17, 2013 at 3:13 PM, Sebastian Huber sebastian.hu...@embedded-brains.de wrote: Hello, it seems that it is not possible to deduce from GCC built-in defines whether we compile for the VFPv3-D16 or VFPv3-D32 floating point unit. touch empty.c arm-eabi-gcc -march=armv7-r -mfpu=vfpv3-d16 -mfloat-abi=hard -E -P -v -dD empty.c vfpv3-d16.txt arm-eabi-gcc -march=armv7-r -mfpu=vfpv3 -mfloat-abi=hard -E -P -v -dD empty.c vfpv3-d32.txt diff vfpv3-d16.txt vfpv3-d32.txt Is it possible to add a built-in define for this? Or as an alternative is it possible to use a GCC configuration target specific multi-lib define that indicates it? I want to use such a compiler provided define to determine how the context switch support in an operating system should look like. -- Sebastian Huber, embedded brains GmbH Address : Dornierstr. 4, D-82178 Puchheim, Germany Phone : +49 89 189 47 41-16 Fax : +49 89 189 47 41-09 E-Mail : sebastian.hu...@embedded-brains.de PGP : Public key available on request. Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
Re: ARM: VFPv3-D16 vs. VFPv3-D32
On 2013-10-17 09:28, Joey Ye wrote: Which Cortex-R you are targeting that supports both D16 and D32? I have a Cortex-R variant which supports D16 only and now I want to add a multi-lib to our GCC target configuration and use a compiler built-in to adjust the context switch code for this multi-lib. -- Sebastian Huber, embedded brains GmbH Address : Dornierstr. 4, D-82178 Puchheim, Germany Phone : +49 89 189 47 41-16 Fax : +49 89 189 47 41-09 E-Mail : sebastian.hu...@embedded-brains.de PGP : Public key available on request. Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
Re: ARM: VFPv3-D16 vs. VFPv3-D32
There is no macro to indicate VFP variances. Probably you can check CPU variance instead. As I know Cortex-R only support D16. Joey On Thu, Oct 17, 2013 at 3:47 PM, Sebastian Huber sebastian.hu...@embedded-brains.de wrote: On 2013-10-17 09:28, Joey Ye wrote: Which Cortex-R you are targeting that supports both D16 and D32? I have a Cortex-R variant which supports D16 only and now I want to add a multi-lib to our GCC target configuration and use a compiler built-in to adjust the context switch code for this multi-lib. -- Sebastian Huber, embedded brains GmbH Address : Dornierstr. 4, D-82178 Puchheim, Germany Phone : +49 89 189 47 41-16 Fax : +49 89 189 47 41-09 E-Mail : sebastian.hu...@embedded-brains.de PGP : Public key available on request. Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
Re: ARM: VFPv3-D16 vs. VFPv3-D32
On 17/10/13 08:56, Joey Ye wrote: There is no macro to indicate VFP variances. Probably you can check CPU variance instead. As I know Cortex-R only support D16. Checking __ARM_ARCH_PROFILE == 'R' would tell you that it's R profile and therefore only 16 regs. R. Joey On Thu, Oct 17, 2013 at 3:47 PM, Sebastian Huber sebastian.hu...@embedded-brains.de wrote: On 2013-10-17 09:28, Joey Ye wrote: Which Cortex-R you are targeting that supports both D16 and D32? I have a Cortex-R variant which supports D16 only and now I want to add a multi-lib to our GCC target configuration and use a compiler built-in to adjust the context switch code for this multi-lib. -- Sebastian Huber, embedded brains GmbH Address : Dornierstr. 4, D-82178 Puchheim, Germany Phone : +49 89 189 47 41-16 Fax : +49 89 189 47 41-09 E-Mail : sebastian.hu...@embedded-brains.de PGP : Public key available on request. Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
Re: ARM: VFPv3-D16 vs. VFPv3-D32
On 2013-10-17 14:24, Richard Earnshaw wrote: On 17/10/13 08:56, Joey Ye wrote: There is no macro to indicate VFP variances. Probably you can check CPU variance instead. As I know Cortex-R only support D16. Checking __ARM_ARCH_PROFILE == 'R' would tell you that it's R profile and therefore only 16 regs. Thanks for this information. I was not aware that no existing Cortex-R variant has a D32 VFP unit. Is the converse true for Cortex-A variants or are there Cortex-A cores with VFP-D16 and VFP-D32 units? -- Sebastian Huber, embedded brains GmbH Address : Dornierstr. 4, D-82178 Puchheim, Germany Phone : +49 89 189 47 41-16 Fax : +49 89 189 47 41-09 E-Mail : sebastian.hu...@embedded-brains.de PGP : Public key available on request. Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
Re: ARM: VFPv3-D16 vs. VFPv3-D32
On 17/10/13 13:46, Sebastian Huber wrote: On 2013-10-17 14:24, Richard Earnshaw wrote: On 17/10/13 08:56, Joey Ye wrote: There is no macro to indicate VFP variances. Probably you can check CPU variance instead. As I know Cortex-R only support D16. Checking __ARM_ARCH_PROFILE == 'R' would tell you that it's R profile and therefore only 16 regs. Thanks for this information. I was not aware that no existing Cortex-R variant has a D32 VFP unit. Is the converse true for Cortex-A variants or are there Cortex-A cores with VFP-D16 and VFP-D32 units? No, the converse is not true. In general (though I don't think there's a guarantee that this will be the case) if you don't have Neon you won't have D32. However, if you have Neon you must have D32. Not all Cortex-A cores have Neon; though many do these days. R.
