diff options
| author | Tom Musta <tommusta@gmail.com> | 2014-04-21 15:55:18 -0500 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-06-16 13:24:32 +0200 |
| commit | 013c3ac070497b2577ae3be444928963e7ac5ab5 (patch) | |
| tree | f686d13bdb422c52b1ec5accd1c9e678f2128774 /target-ppc/dfp_helper.c | |
| parent | 7796676fddc9f6b035c6a9fd872258b53c7d8644 (diff) | |
target-ppc: Introduce DFP Encode BCD to DPD
Add emulation of the PowerPC Decimal Floating Point Encode Binary
Coded Decimal to Densely Packed Decimal instructions denbcd[q][.].
Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-ppc/dfp_helper.c')
| -rw-r--r-- | target-ppc/dfp_helper.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/target-ppc/dfp_helper.c b/target-ppc/dfp_helper.c index df40da7ca9..c6c104b739 100644 --- a/target-ppc/dfp_helper.c +++ b/target-ppc/dfp_helper.c @@ -1049,3 +1049,75 @@ void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *b, uint32_t sp) \ DFP_HELPER_DEDPD(ddedpd, 64) DFP_HELPER_DEDPD(ddedpdq, 128) + +static inline uint8_t dfp_get_bcd_digit_64(uint64_t *t, unsigned n) +{ + return *t >> ((n << 2) & 63) & 15; +} + +static inline uint8_t dfp_get_bcd_digit_128(uint64_t *t, unsigned n) +{ + return t[(n & 0x10) ? HI_IDX : LO_IDX] >> ((n << 2) & 63) & 15; +} + +#define DFP_HELPER_ENBCD(op, size) \ +void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *b, uint32_t s) \ +{ \ + struct PPC_DFP dfp; \ + uint8_t digits[32]; \ + int n = 0, offset = 0, sgn = 0, nonzero = 0; \ + \ + dfp_prepare_decimal##size(&dfp, 0, b, env); \ + \ + decNumberZero(&dfp.t); \ + \ + if (s) { \ + uint8_t sgnNibble = dfp_get_bcd_digit_##size(dfp.b64, offset++); \ + switch (sgnNibble) { \ + case 0xD: \ + case 0xB: \ + sgn = 1; \ + break; \ + case 0xC: \ + case 0xF: \ + case 0xA: \ + case 0xE: \ + sgn = 0; \ + break; \ + default: \ + dfp_set_FPSCR_flag(&dfp, FP_VX | FP_VXCVI, FPSCR_VE); \ + return; \ + } \ + } \ + \ + while (offset < (size)/4) { \ + n++; \ + digits[(size)/4-n] = dfp_get_bcd_digit_##size(dfp.b64, offset++); \ + if (digits[(size)/4-n] > 10) { \ + dfp_set_FPSCR_flag(&dfp, FP_VX | FP_VXCVI, FPSCR_VE); \ + return; \ + } else { \ + nonzero |= (digits[(size)/4-n] > 0); \ + } \ + } \ + \ + if (nonzero) { \ + decNumberSetBCD(&dfp.t, digits+((size)/4)-n, n); \ + } \ + \ + if (s && sgn) { \ + dfp.t.bits |= DECNEG; \ + } \ + decimal##size##FromNumber((decimal##size *)dfp.t64, &dfp.t, \ + &dfp.context); \ + dfp_set_FPRF_from_FRT(&dfp); \ + if ((size) == 64) { \ + t[0] = dfp.t64[0]; \ + } else if ((size) == 128) { \ + t[0] = dfp.t64[HI_IDX]; \ + t[1] = dfp.t64[LO_IDX]; \ + } \ +} + +DFP_HELPER_ENBCD(denbcd, 64) +DFP_HELPER_ENBCD(denbcdq, 128) |