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| author | Tom Musta <tommusta@gmail.com> | 2014-04-21 15:55:08 -0500 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-06-16 13:24:31 +0200 |
| commit | f3d2b0bce098456539ea16eb92af6197b68dc8d8 (patch) | |
| tree | f3542f94a05f8ae2ba0f0eef8ff02ba490da5164 /target-ppc/dfp_helper.c | |
| parent | 1bf9c0e1339858505841117727cf10455171641f (diff) | |
| download | qemu-f3d2b0bce098456539ea16eb92af6197b68dc8d8.tar.gz | |
target-ppc: Introduce DFP Test Exponent
Add emulation of the PowerPC Decimal Floating Point Test Exponent
instructions dtstex[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 | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/target-ppc/dfp_helper.c b/target-ppc/dfp_helper.c index 7f18fd9890..43eb70d964 100644 --- a/target-ppc/dfp_helper.c +++ b/target-ppc/dfp_helper.c @@ -504,3 +504,35 @@ uint32_t helper_##op(CPUPPCState *env, uint64_t *a, uint32_t dcm) \ DFP_HELPER_TSTDG(dtstdg, 64) DFP_HELPER_TSTDG(dtstdgq, 128) + +#define DFP_HELPER_TSTEX(op, size) \ +uint32_t helper_##op(CPUPPCState *env, uint64_t *a, uint64_t *b) \ +{ \ + struct PPC_DFP dfp; \ + int expa, expb, a_is_special, b_is_special; \ + \ + dfp_prepare_decimal##size(&dfp, a, b, env); \ + \ + expa = dfp.a.exponent; \ + expb = dfp.b.exponent; \ + a_is_special = decNumberIsSpecial(&dfp.a); \ + b_is_special = decNumberIsSpecial(&dfp.b); \ + \ + if (a_is_special || b_is_special) { \ + int atype = a_is_special ? (decNumberIsNaN(&dfp.a) ? 4 : 2) : 1; \ + int btype = b_is_special ? (decNumberIsNaN(&dfp.b) ? 4 : 2) : 1; \ + dfp.crbf = (atype ^ btype) ? 0x1 : 0x2; \ + } else if (expa < expb) { \ + dfp.crbf = 0x8; \ + } else if (expa > expb) { \ + dfp.crbf = 0x4; \ + } else { \ + dfp.crbf = 0x2; \ + } \ + \ + dfp_set_FPCC_from_CRBF(&dfp); \ + return dfp.crbf; \ +} + +DFP_HELPER_TSTEX(dtstex, 64) +DFP_HELPER_TSTEX(dtstexq, 128) |