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target-ppc: Introduce DFP Round to Integer

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Add emulation of the PowerPC Decimal Floating Point (DFP) Round
to FP Integer With Inexact (drintx[q][.]) and DFP Round to FP
Integer Without Inexact (drintn[q][.]) instructions.

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 15:55:12 -05:00 • committed by Alexander Graf
parent 512918aa79
commit 97c0d93041
3 changed files with 52 additions and 0 deletions
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40
target-ppc/dfp_helper.c
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@ -800,3 +800,43 @@ void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *a, \
DFP_HELPER_RRND(drrnd, 64)
DFP_HELPER_RRND(drrndq, 128)
#define DFP_HELPER_RINT(op, postprocs, size) \
void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *b, \
uint32_t r, uint32_t rmc) \
{ \
struct PPC_DFP dfp; \
\
dfp_prepare_decimal##size(&dfp, 0, b, env); \
\
dfp_set_round_mode_from_immediate(r, rmc, &dfp); \
decNumberToIntegralExact(&dfp.t, &dfp.b, &dfp.context); \
decimal##size##FromNumber((decimal##size *)dfp.t64, &dfp.t, &dfp.context); \
postprocs(&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]; \
} \
}
static void RINTX_PPs(struct PPC_DFP *dfp)
{
dfp_set_FPRF_from_FRT(dfp);
dfp_check_for_XX(dfp);
dfp_check_for_VXSNAN(dfp);
}
DFP_HELPER_RINT(drintx, RINTX_PPs, 64)
DFP_HELPER_RINT(drintxq, RINTX_PPs, 128)
static void RINTN_PPs(struct PPC_DFP *dfp)
{
dfp_set_FPRF_from_FRT(dfp);
dfp_check_for_VXSNAN(dfp);
}
DFP_HELPER_RINT(drintn, RINTN_PPs, 64)
DFP_HELPER_RINT(drintnq, RINTN_PPs, 128)