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target-ppc: Introduce DFP Test Data Class

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Add emulation of the PowerPC Decimal Floating Point Test Data Class
instructions dtstdc[q][.].

Signed-off-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Tom Musta 2014-04-21 15:55:06 -05:00 • committed by Alexander Graf
parent 5833505be6
commit e601c1eead
3 changed files with 34 additions and 0 deletions
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28
target-ppc/dfp_helper.c
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@ -421,3 +421,31 @@ static void CMPO_PPs(struct PPC_DFP *dfp)
DFP_HELPER_BF_AB(dcmpo, decNumberCompare, CMPO_PPs, 64)
DFP_HELPER_BF_AB(dcmpoq, decNumberCompare, CMPO_PPs, 128)
#define DFP_HELPER_TSTDC(op, size) \
uint32_t helper_##op(CPUPPCState *env, uint64_t *a, uint32_t dcm) \
{ \
struct PPC_DFP dfp; \
int match = 0; \
\
dfp_prepare_decimal##size(&dfp, a, 0, env); \
\
match |= (dcm & 0x20) && decNumberIsZero(&dfp.a); \
match |= (dcm & 0x10) && decNumberIsSubnormal(&dfp.a, &dfp.context); \
match |= (dcm & 0x08) && decNumberIsNormal(&dfp.a, &dfp.context); \
match |= (dcm & 0x04) && decNumberIsInfinite(&dfp.a); \
match |= (dcm & 0x02) && decNumberIsQNaN(&dfp.a); \
match |= (dcm & 0x01) && decNumberIsSNaN(&dfp.a); \
\
if (decNumberIsNegative(&dfp.a)) { \
dfp.crbf = match ? 0xA : 0x8; \
} else { \
dfp.crbf = match ? 0x2 : 0x0; \
} \
\
dfp_set_FPCC_from_CRBF(&dfp); \
return dfp.crbf; \
}
DFP_HELPER_TSTDC(dtstdc, 64)
DFP_HELPER_TSTDC(dtstdcq, 128)