diff options
author | Peter Maydell <peter.maydell@linaro.org> | 2011-01-14 20:39:18 +0100 |
---|---|---|
committer | Aurelien Jarno <aurelien@aurel32.net> | 2011-01-14 20:39:18 +0100 |
commit | 3a492f3a606642879637d50777444d82440c9f5c (patch) | |
tree | 36c28acfabbaca93bfbaf4e3cc8f8e6950daf1ae /target-arm/cpu.h | |
parent | 9ea62f571ce8953dba1d2bad2bdeaf9c3a84b7d7 (diff) |
target-arm: Add support for 'Standard FPSCR Value' as used by Neon
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>
Diffstat (limited to 'target-arm/cpu.h')
-rw-r--r-- | target-arm/cpu.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/target-arm/cpu.h b/target-arm/cpu.h index 340933ef50..e501cf59f1 100644 --- a/target-arm/cpu.h +++ b/target-arm/cpu.h @@ -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; |