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target-arm: Add support for 'Standard FPSCR Value' as used by Neon

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Add support to the ARM helper routines for a second fp_status value
which should be used for operations which the ARM ARM indicates use
"ARM standard floating-point arithmetic" rather than being controlled
by the rounding/flush/NaN settings in the FPSCR.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Peter Maydell 2011-01-14 20:39:18 +01:00 • committed by Aurelien Jarno
parent 9ea62f571c
commit 3a492f3a60
2 changed files with 18 additions and 0 deletions
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13
target-arm/cpu.h
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@ -173,7 +173,20 @@ typedef struct CPUARMState {
/* scratch space when Tn are not sufficient. */
uint32_t scratch[8];
/* fp_status is the "normal" fp status. standard_fp_status retains
* values corresponding to the ARM "Standard FPSCR Value", ie
* default-NaN, flush-to-zero, round-to-nearest and is used by
* any operations (generally Neon) which the architecture defines
* as controlled by the standard FPSCR value rather than the FPSCR.
*
* To avoid having to transfer exception bits around, we simply
* say that the FPSCR cumulative exception flags are the logical
* OR of the flags in the two fp statuses. This relies on the
* only thing which needs to read the exception flags being
* an explicit FPSCR read.
*/
float_status fp_status;
float_status standard_fp_status;
} vfp;
uint32_t exclusive_addr;
uint32_t exclusive_val;