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target/m68k: add fmod/frem

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Using a local m68k floatx80_mod()
[copied from previous:
Written by Andreas Grabher for Previous, NeXT Computer Emulator.]

The quotient byte of the FPSR is updated with
the result of the operation.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180224201802.911-3-laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2018-02-24 21:18:00 +01:00
parent 88857aca93
commit 591596b77a
7 changed files with 176 additions and 2 deletions
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35
target/m68k/fpu_helper.c
View file

@ -23,7 +23,7 @@
#include "exec/helper-proto.h"
#include "exec/exec-all.h"
#include "exec/cpu_ldst.h"
#include "fpu/softfloat.h"
#include "softfloat.h"
/* Undefined offsets may be different on various FPU.
* On 68040 they return 0.0 (floatx80_zero)
@ -509,3 +509,36 @@ uint32_t HELPER(fmovemd_ld_postinc)(CPUM68KState *env, uint32_t addr,
{
return fmovem_postinc(env, addr, mask, cpu_ld_float64_ra);
}
static void make_quotient(CPUM68KState *env, floatx80 val)
{
int32_t quotient;
int sign;
if (floatx80_is_any_nan(val)) {
return;
}
quotient = floatx80_to_int32(val, &env->fp_status);
sign = quotient < 0;
if (sign) {
quotient = -quotient;
}
quotient = (sign << 7) | (quotient & 0x7f);
env->fpsr = (env->fpsr & ~FPSR_QT_MASK) | (quotient << FPSR_QT_SHIFT);
}
void HELPER(fmod)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
res->d = floatx80_mod(val1->d, val0->d, &env->fp_status);
make_quotient(env, res->d);
}
void HELPER(frem)(CPUM68KState *env, FPReg *res, FPReg *val0, FPReg *val1)
{
res->d = floatx80_rem(val1->d, val0->d, &env->fp_status);
make_quotient(env, res->d);
}