motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-06 09:13:55 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

target/ppc: Implement DCTFIXQQ

Browse source 
Implement the following PowerISA v3.1 instruction:
dctfixqq: DFP Convert To Fixed Quadword Quad

Signed-off-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20211029192417.400707-8-luis.pires@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Luis Pires 2021-10-29 16:24:09 -03:00 • committed by David Gibson
parent 21d7826fdb
commit 328747f32f
4 changed files with 75 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

52
target/ppc/dfp_helper.c
View file

@ -51,6 +51,11 @@ static void set_dfp128(ppc_fprp_t *dfp, ppc_vsr_t *src)
dfp[1].VsrD(0) = src->VsrD(1);
}
static void set_dfp128_to_avr(ppc_avr_t *dst, ppc_vsr_t *src)
{
*dst = *src;
}
struct PPC_DFP {
CPUPPCState *env;
ppc_vsr_t vt, va, vb;
@ -1020,6 +1025,53 @@ void helper_##op(CPUPPCState *env, ppc_fprp_t *t, ppc_fprp_t *b) \
DFP_HELPER_CTFIX(dctfix, 64)
DFP_HELPER_CTFIX(dctfixq, 128)
void helper_DCTFIXQQ(CPUPPCState *env, ppc_avr_t *t, ppc_fprp_t *b)
{
struct PPC_DFP dfp;
dfp_prepare_decimal128(&dfp, 0, b, env);
if (unlikely(decNumberIsSpecial(&dfp.b))) {
uint64_t invalid_flags = FP_VX | FP_VXCVI;
if (decNumberIsInfinite(&dfp.b)) {
if (decNumberIsNegative(&dfp.b)) {
dfp.vt.VsrD(0) = INT64_MIN;
dfp.vt.VsrD(1) = 0;
} else {
dfp.vt.VsrD(0) = INT64_MAX;
dfp.vt.VsrD(1) = UINT64_MAX;
}
} else { /* NaN */
dfp.vt.VsrD(0) = INT64_MIN;
dfp.vt.VsrD(1) = 0;
if (decNumberIsSNaN(&dfp.b)) {
invalid_flags |= FP_VXSNAN;
}
}
dfp_set_FPSCR_flag(&dfp, invalid_flags, FP_VE);
} else if (unlikely(decNumberIsZero(&dfp.b))) {
dfp.vt.VsrD(0) = 0;
dfp.vt.VsrD(1) = 0;
} else {
decNumberToIntegralExact(&dfp.b, &dfp.b, &dfp.context);
decNumberIntegralToInt128(&dfp.b, &dfp.context,
&dfp.vt.VsrD(1), &dfp.vt.VsrD(0));
if (decContextTestStatus(&dfp.context, DEC_Invalid_operation)) {
if (decNumberIsNegative(&dfp.b)) {
dfp.vt.VsrD(0) = INT64_MIN;
dfp.vt.VsrD(1) = 0;
} else {
dfp.vt.VsrD(0) = INT64_MAX;
dfp.vt.VsrD(1) = UINT64_MAX;
}
dfp_set_FPSCR_flag(&dfp, FP_VX | FP_VXCVI, FP_VE);
} else {
dfp_check_for_XX(&dfp);
}
}
set_dfp128_to_avr(t, &dfp.vt);
}
static inline void dfp_set_bcd_digit_64(ppc_vsr_t *t, uint8_t digit,
unsigned n)
{