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| author | Tom Musta <tommusta@gmail.com> | 2014-04-21 15:55:19 -0500 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-06-16 13:24:32 +0200 |
| commit | e8a484603146f7e2523749ad06e6ea43b26cf411 (patch) | |
| tree | 3bafa4a45ea7735a7662a06a4fc1f339e3434a0b /target-ppc/dfp_helper.c | |
| parent | 013c3ac070497b2577ae3be444928963e7ac5ab5 (diff) | |
target-ppc: Introduce DFP Extract Biased Exponent
Add emulation of the PowerPC Decimal Floating Point Extract
Biased Exponent instructions dxex[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 | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/target-ppc/dfp_helper.c b/target-ppc/dfp_helper.c index c6c104b739..8c8ee795c7 100644 --- a/target-ppc/dfp_helper.c +++ b/target-ppc/dfp_helper.c @@ -1121,3 +1121,34 @@ void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *b, uint32_t s) \ DFP_HELPER_ENBCD(denbcd, 64) DFP_HELPER_ENBCD(denbcdq, 128) + +#define DFP_HELPER_XEX(op, size) \ +void helper_##op(CPUPPCState *env, uint64_t *t, uint64_t *b) \ +{ \ + struct PPC_DFP dfp; \ + \ + dfp_prepare_decimal##size(&dfp, 0, b, env); \ + \ + if (unlikely(decNumberIsSpecial(&dfp.b))) { \ + if (decNumberIsInfinite(&dfp.b)) { \ + *t = -1; \ + } else if (decNumberIsSNaN(&dfp.b)) { \ + *t = -3; \ + } else if (decNumberIsQNaN(&dfp.b)) { \ + *t = -2; \ + } else { \ + assert(0); \ + } \ + } else { \ + if ((size) == 64) { \ + *t = dfp.b.exponent + 398; \ + } else if ((size) == 128) { \ + *t = dfp.b.exponent + 6176; \ + } else { \ + assert(0); \ + } \ + } \ +} + +DFP_HELPER_XEX(dxex, 64) +DFP_HELPER_XEX(dxexq, 128) |