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target-ppc: Introduce DFP Test Significance

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Add emulation of the PowerPC Decimal Floating Point Test Significance
instructions dtstsf[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 15:55:09 -05:00 • committed by Alexander Graf
parent f3d2b0bce0
commit f6022a7684
3 changed files with 41 additions and 0 deletions
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35
target-ppc/dfp_helper.c
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@ -536,3 +536,38 @@ uint32_t helper_##op(CPUPPCState *env, uint64_t *a, uint64_t *b) \
DFP_HELPER_TSTEX(dtstex, 64)
DFP_HELPER_TSTEX(dtstexq, 128)
#define DFP_HELPER_TSTSF(op, size) \
uint32_t helper_##op(CPUPPCState *env, uint64_t *a, uint64_t *b) \
{ \
struct PPC_DFP dfp; \
unsigned k; \
\
dfp_prepare_decimal##size(&dfp, 0, b, env); \
\
k = *a & 0x3F; \
\
if (unlikely(decNumberIsSpecial(&dfp.b))) { \
dfp.crbf = 1; \
} else if (k == 0) { \
dfp.crbf = 4; \
} else if (unlikely(decNumberIsZero(&dfp.b))) { \
/* Zero has no sig digits */ \
dfp.crbf = 4; \
} else { \
unsigned nsd = dfp.b.digits; \
if (k < nsd) { \
dfp.crbf = 8; \
} else if (k > nsd) { \
dfp.crbf = 4; \
} else { \
dfp.crbf = 2; \
} \
} \
\
dfp_set_FPCC_from_CRBF(&dfp); \
return dfp.crbf; \
}
DFP_HELPER_TSTSF(dtstsf, 64)
DFP_HELPER_TSTSF(dtstsfq, 128)