motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-07 09:43:56 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

target-ppc: Introduce DFP Extract Biased Exponent

Browse source 
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>
This commit is contained in:
Tom Musta 2014-04-21 15:55:19 -05:00 • committed by Alexander Graf
parent 013c3ac070
commit e8a4846031
3 changed files with 37 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

31
target-ppc/dfp_helper.c
View file

@ -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)