diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2021-06-28 14:58:20 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2021-07-02 11:48:36 +0100 |
| commit | dfd66bc0f37dde37b8b2d7bad3a7075332e75fb4 (patch) | |
| tree | e3c363f88c3b817a2574e750ee37a5e0dcd843a6 /target/arm/translate.h | |
| parent | 303db86fc73c68d8774203d4796b9995cc122886 (diff) | |
target/arm: Make asimd_imm_const() public
The function asimd_imm_const() in translate-neon.c is an
implementation of the pseudocode AdvSIMDExpandImm(), which we will
also want for MVE. Move the implementation to translate.c, with a
prototype in translate.h.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210628135835.6690-4-peter.maydell@linaro.org
Diffstat (limited to 'target/arm/translate.h')
| -rw-r--r-- | target/arm/translate.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/target/arm/translate.h b/target/arm/translate.h index 99c917c571..6c8d5f6ede 100644 --- a/target/arm/translate.h +++ b/target/arm/translate.h @@ -532,4 +532,20 @@ static inline MemOp finalize_memop(DisasContext *s, MemOp opc) return opc | s->be_data; } +/** + * asimd_imm_const: Expand an encoded SIMD constant value + * + * Expand a SIMD constant value. This is essentially the pseudocode + * AdvSIMDExpandImm, except that we also perform the boolean NOT needed for + * VMVN and VBIC (when cmode < 14 && op == 1). + * + * The combination cmode == 15 op == 1 is a reserved encoding for AArch32; + * callers must catch this. + * + * cmode = 2,3,4,5,6,7,10,11,12,13 imm=0 was UNPREDICTABLE in v7A but + * is either not unpredictable or merely CONSTRAINED UNPREDICTABLE in v8A; + * we produce an immediate constant value of 0 in these cases. + */ +uint64_t asimd_imm_const(uint32_t imm, int cmode, int op); + #endif /* TARGET_ARM_TRANSLATE_H */ |