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author | Juha Riihimäki <juha.riihimaki@nokia.com> | 2011-02-09 15:42:32 +0000 |
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committer | Aurelien Jarno <aurelien@aurel32.net> | 2011-02-09 19:37:47 +0100 |
commit | af1bbf30c407cb194599a4e1724c38c7bf1d94b3 (patch) | |
tree | 3045df15e10ee27f990baad363d5763469df4e5f /target-arm/neon_helper.c | |
parent | c0c1dc992584b8ccbae0e8f8b09124b76662633b (diff) | |
download | hqemu-af1bbf30c407cb194599a4e1724c38c7bf1d94b3.zip hqemu-af1bbf30c407cb194599a4e1724c38c7bf1d94b3.tar.gz |
target-arm: Fix VQMOVUN Neon instruction.
VQMOVUN does a signed-to-unsigned saturating conversion. This is
different from both the signed-to-signed and unsigned-to-unsigned
conversions already implemented, so we need a new set of helper
functions (neon_unarrow_sat*).
Signed-off-by: Juha Riihimäki <juha.riihimaki@nokia.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'target-arm/neon_helper.c')
-rw-r--r-- | target-arm/neon_helper.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/target-arm/neon_helper.c b/target-arm/neon_helper.c index 268af33..a7cf383 100644 --- a/target-arm/neon_helper.c +++ b/target-arm/neon_helper.c @@ -1053,6 +1053,33 @@ uint32_t HELPER(neon_narrow_round_high_u16)(uint64_t x) return ((x >> 16) & 0xffff) | ((x >> 32) & 0xffff0000); } +uint32_t HELPER(neon_unarrow_sat8)(CPUState *env, uint64_t x) +{ + uint16_t s; + uint8_t d; + uint32_t res = 0; +#define SAT8(n) \ + s = x >> n; \ + if (s & 0x8000) { \ + SET_QC(); \ + } else { \ + if (s > 0xff) { \ + d = 0xff; \ + SET_QC(); \ + } else { \ + d = s; \ + } \ + res |= (uint32_t)d << (n / 2); \ + } + + SAT8(0); + SAT8(16); + SAT8(32); + SAT8(48); +#undef SAT8 + return res; +} + uint32_t HELPER(neon_narrow_sat_u8)(CPUState *env, uint64_t x) { uint16_t s; @@ -1099,6 +1126,29 @@ uint32_t HELPER(neon_narrow_sat_s8)(CPUState *env, uint64_t x) return res; } +uint32_t HELPER(neon_unarrow_sat16)(CPUState *env, uint64_t x) +{ + uint32_t high; + uint32_t low; + low = x; + if (low & 0x80000000) { + low = 0; + SET_QC(); + } else if (low > 0xffff) { + low = 0xffff; + SET_QC(); + } + high = x >> 32; + if (high & 0x80000000) { + high = 0; + SET_QC(); + } else if (high > 0xffff) { + high = 0xffff; + SET_QC(); + } + return low | (high << 16); +} + uint32_t HELPER(neon_narrow_sat_u16)(CPUState *env, uint64_t x) { uint32_t high; @@ -1133,6 +1183,19 @@ uint32_t HELPER(neon_narrow_sat_s16)(CPUState *env, uint64_t x) return (uint16_t)low | (high << 16); } +uint32_t HELPER(neon_unarrow_sat32)(CPUState *env, uint64_t x) +{ + if (x & 0x8000000000000000ull) { + SET_QC(); + return 0; + } + if (x > 0xffffffffu) { + SET_QC(); + return 0xffffffffu; + } + return x; +} + uint32_t HELPER(neon_narrow_sat_u32)(CPUState *env, uint64_t x) { if (x > 0xffffffffu) { |