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| author | Damien George <damien.p.george@gmail.com> | 2019-06-17 23:19:34 +1000 |
|---|---|---|
| committer | Scott Shawcroft <scott@tannewt.org> | 2019-12-12 11:10:10 -0800 |
| commit | 767d47dd6025e8046b03e6b307fd0ba6a81cf504 (patch) | |
| tree | eb89019d86c2b997dd5b8621d879fb02225e4b42 /py/nlr.h | |
| parent | 1cf0ce094a4a1571b7404643e7a3b992592317a5 (diff) | |
py/nlrthumb: Save and restore VFP registers s16-s21 when CPU has them.
These s16-s21 registers are used by gcc so need to be saved. Future
versions of gcc (beyond v9.1.0), or other compilers, may eventually need
additional registers saved/restored.
See issue #4844.
Diffstat (limited to 'py/nlr.h')
| -rw-r--r-- | py/nlr.h | 9 |
1 files changed, 8 insertions, 1 deletions
@@ -54,7 +54,14 @@ #endif #elif defined(__thumb2__) || defined(__thumb__) || defined(__arm__) #define MICROPY_NLR_THUMB (1) - #define MICROPY_NLR_NUM_REGS (10) + #if defined(__SOFTFP__) + #define MICROPY_NLR_NUM_REGS (10) + #else + // With hardware FP registers s16-s31 are callee save so in principle + // should be saved and restored by the NLR code. gcc only uses s16-s21 + // so only save/restore those as an optimisation. + #define MICROPY_NLR_NUM_REGS (10 + 6) + #endif #elif defined(__xtensa__) #define MICROPY_NLR_XTENSA (1) #define MICROPY_NLR_NUM_REGS (10) |