diff options
| author | Tom Musta <tommusta@gmail.com> | 2014-04-21 15:55:07 -0500 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-06-16 13:24:30 +0200 |
| commit | 1bf9c0e1339858505841117727cf10455171641f (patch) | |
| tree | b8702ad595d4a148ce137d6536c1842d158a8345 /target-ppc/dfp_helper.c | |
| parent | e601c1eead579b9a849dc4bfc2da2038cef361fd (diff) | |
target-ppc: Introduce DFP Test Data Group
Add emulation of the PowerPC Decimal Floating Point Test Data
Group instructions dtstdg[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 | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/target-ppc/dfp_helper.c b/target-ppc/dfp_helper.c index fcd6fef5d3..7f18fd9890 100644 --- a/target-ppc/dfp_helper.c +++ b/target-ppc/dfp_helper.c @@ -449,3 +449,58 @@ uint32_t helper_##op(CPUPPCState *env, uint64_t *a, uint32_t dcm) \ DFP_HELPER_TSTDC(dtstdc, 64) DFP_HELPER_TSTDC(dtstdcq, 128) + +#define DFP_HELPER_TSTDG(op, size) \ +uint32_t helper_##op(CPUPPCState *env, uint64_t *a, uint32_t dcm) \ +{ \ + struct PPC_DFP dfp; \ + int minexp, maxexp, nzero_digits, nzero_idx, is_negative, is_zero, \ + is_extreme_exp, is_subnormal, is_normal, leftmost_is_nonzero, \ + match; \ + \ + dfp_prepare_decimal##size(&dfp, a, 0, env); \ + \ + if ((size) == 64) { \ + minexp = -398; \ + maxexp = 369; \ + nzero_digits = 16; \ + nzero_idx = 5; \ + } else if ((size) == 128) { \ + minexp = -6176; \ + maxexp = 6111; \ + nzero_digits = 34; \ + nzero_idx = 11; \ + } \ + \ + is_negative = decNumberIsNegative(&dfp.a); \ + is_zero = decNumberIsZero(&dfp.a); \ + is_extreme_exp = (dfp.a.exponent == maxexp) || \ + (dfp.a.exponent == minexp); \ + is_subnormal = decNumberIsSubnormal(&dfp.a, &dfp.context); \ + is_normal = decNumberIsNormal(&dfp.a, &dfp.context); \ + leftmost_is_nonzero = (dfp.a.digits == nzero_digits) && \ + (dfp.a.lsu[nzero_idx] != 0); \ + match = 0; \ + \ + match |= (dcm & 0x20) && is_zero && !is_extreme_exp; \ + match |= (dcm & 0x10) && is_zero && is_extreme_exp; \ + match |= (dcm & 0x08) && \ + (is_subnormal || (is_normal && is_extreme_exp)); \ + match |= (dcm & 0x04) && is_normal && !is_extreme_exp && \ + !leftmost_is_nonzero; \ + match |= (dcm & 0x02) && is_normal && !is_extreme_exp && \ + leftmost_is_nonzero; \ + match |= (dcm & 0x01) && decNumberIsSpecial(&dfp.a); \ + \ + if (is_negative) { \ + dfp.crbf = match ? 0xA : 0x8; \ + } else { \ + dfp.crbf = match ? 0x2 : 0x0; \ + } \ + \ + dfp_set_FPCC_from_CRBF(&dfp); \ + return dfp.crbf; \ +} + +DFP_HELPER_TSTDG(dtstdg, 64) +DFP_HELPER_TSTDG(dtstdgq, 128) |