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| author | Tom Musta <tommusta@gmail.com> | 2014-04-21 15:55:09 -0500 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-06-16 13:24:31 +0200 |
| commit | f6022a7684042b441b953ea27795afa897bcd35c (patch) | |
| tree | 3c936d16f2a8aa44b5f12c7957556b39bb685590 /target-ppc/dfp_helper.c | |
| parent | f3d2b0bce098456539ea16eb92af6197b68dc8d8 (diff) | |
| download | qemu-f6022a7684042b441b953ea27795afa897bcd35c.tar.gz | |
target-ppc: Introduce DFP Test Significance
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>
Diffstat (limited to 'target-ppc/dfp_helper.c')
| -rw-r--r-- | target-ppc/dfp_helper.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/target-ppc/dfp_helper.c b/target-ppc/dfp_helper.c index 43eb70d964..574956a19f 100644 --- a/target-ppc/dfp_helper.c +++ b/target-ppc/dfp_helper.c @@ -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) |