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target-alpha: Move VAX helpers to a new file
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Keep the IEEE and VAX floating point emulation separate.

Signed-off-by: Richard Henderson <rth@twiddle.net>
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@rth7680
rth7680 committed May 18, 2015
1 parent 385057c commit 9354452
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Showing 3 changed files with 354 additions and 329 deletions.
2 changes: 1 addition & 1 deletion target-alpha/Makefile.objs
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
obj-$(CONFIG_SOFTMMU) += machine.o
obj-y += translate.o helper.o cpu.o
obj-y += int_helper.o fpu_helper.o sys_helper.o mem_helper.o
obj-y += int_helper.o fpu_helper.o vax_helper.o sys_helper.o mem_helper.o
obj-y += gdbstub.o
328 changes: 0 additions & 328 deletions target-alpha/fpu_helper.c
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Original file line number Diff line number Diff line change
Expand Up @@ -126,263 +126,6 @@ void helper_ieee_input_cmp(CPUAlphaState *env, uint64_t val)
}
}

/* F floating (VAX) */
static uint64_t float32_to_f(float32 fa)
{
uint64_t r, exp, mant, sig;
CPU_FloatU a;

a.f = fa;
sig = ((uint64_t)a.l & 0x80000000) << 32;
exp = (a.l >> 23) & 0xff;
mant = ((uint64_t)a.l & 0x007fffff) << 29;

if (exp == 255) {
/* NaN or infinity */
r = 1; /* VAX dirty zero */
} else if (exp == 0) {
if (mant == 0) {
/* Zero */
r = 0;
} else {
/* Denormalized */
r = sig | ((exp + 1) << 52) | mant;
}
} else {
if (exp >= 253) {
/* Overflow */
r = 1; /* VAX dirty zero */
} else {
r = sig | ((exp + 2) << 52);
}
}

return r;
}

static float32 f_to_float32(CPUAlphaState *env, uintptr_t retaddr, uint64_t a)
{
uint32_t exp, mant_sig;
CPU_FloatU r;

exp = ((a >> 55) & 0x80) | ((a >> 52) & 0x7f);
mant_sig = ((a >> 32) & 0x80000000) | ((a >> 29) & 0x007fffff);

if (unlikely(!exp && mant_sig)) {
/* Reserved operands / Dirty zero */
dynamic_excp(env, retaddr, EXCP_OPCDEC, 0);
}

if (exp < 3) {
/* Underflow */
r.l = 0;
} else {
r.l = ((exp - 2) << 23) | mant_sig;
}

return r.f;
}

uint32_t helper_f_to_memory(uint64_t a)
{
uint32_t r;
r = (a & 0x00001fffe0000000ull) >> 13;
r |= (a & 0x07ffe00000000000ull) >> 45;
r |= (a & 0xc000000000000000ull) >> 48;
return r;
}

uint64_t helper_memory_to_f(uint32_t a)
{
uint64_t r;
r = ((uint64_t)(a & 0x0000c000)) << 48;
r |= ((uint64_t)(a & 0x003fffff)) << 45;
r |= ((uint64_t)(a & 0xffff0000)) << 13;
if (!(a & 0x00004000)) {
r |= 0x7ll << 59;
}
return r;
}

/* ??? Emulating VAX arithmetic with IEEE arithmetic is wrong. We should
either implement VAX arithmetic properly or just signal invalid opcode. */

uint64_t helper_addf(CPUAlphaState *env, uint64_t a, uint64_t b)
{
float32 fa, fb, fr;

fa = f_to_float32(env, GETPC(), a);
fb = f_to_float32(env, GETPC(), b);
fr = float32_add(fa, fb, &FP_STATUS);
return float32_to_f(fr);
}

uint64_t helper_subf(CPUAlphaState *env, uint64_t a, uint64_t b)
{
float32 fa, fb, fr;

fa = f_to_float32(env, GETPC(), a);
fb = f_to_float32(env, GETPC(), b);
fr = float32_sub(fa, fb, &FP_STATUS);
return float32_to_f(fr);
}

uint64_t helper_mulf(CPUAlphaState *env, uint64_t a, uint64_t b)
{
float32 fa, fb, fr;

fa = f_to_float32(env, GETPC(), a);
fb = f_to_float32(env, GETPC(), b);
fr = float32_mul(fa, fb, &FP_STATUS);
return float32_to_f(fr);
}

uint64_t helper_divf(CPUAlphaState *env, uint64_t a, uint64_t b)
{
float32 fa, fb, fr;

fa = f_to_float32(env, GETPC(), a);
fb = f_to_float32(env, GETPC(), b);
fr = float32_div(fa, fb, &FP_STATUS);
return float32_to_f(fr);
}

uint64_t helper_sqrtf(CPUAlphaState *env, uint64_t t)
{
float32 ft, fr;

ft = f_to_float32(env, GETPC(), t);
fr = float32_sqrt(ft, &FP_STATUS);
return float32_to_f(fr);
}


/* G floating (VAX) */
static uint64_t float64_to_g(float64 fa)
{
uint64_t r, exp, mant, sig;
CPU_DoubleU a;

a.d = fa;
sig = a.ll & 0x8000000000000000ull;
exp = (a.ll >> 52) & 0x7ff;
mant = a.ll & 0x000fffffffffffffull;

if (exp == 2047) {
/* NaN or infinity */
r = 1; /* VAX dirty zero */
} else if (exp == 0) {
if (mant == 0) {
/* Zero */
r = 0;
} else {
/* Denormalized */
r = sig | ((exp + 1) << 52) | mant;
}
} else {
if (exp >= 2045) {
/* Overflow */
r = 1; /* VAX dirty zero */
} else {
r = sig | ((exp + 2) << 52);
}
}

return r;
}

static float64 g_to_float64(CPUAlphaState *env, uintptr_t retaddr, uint64_t a)
{
uint64_t exp, mant_sig;
CPU_DoubleU r;

exp = (a >> 52) & 0x7ff;
mant_sig = a & 0x800fffffffffffffull;

if (!exp && mant_sig) {
/* Reserved operands / Dirty zero */
dynamic_excp(env, retaddr, EXCP_OPCDEC, 0);
}

if (exp < 3) {
/* Underflow */
r.ll = 0;
} else {
r.ll = ((exp - 2) << 52) | mant_sig;
}

return r.d;
}

uint64_t helper_g_to_memory(uint64_t a)
{
uint64_t r;
r = (a & 0x000000000000ffffull) << 48;
r |= (a & 0x00000000ffff0000ull) << 16;
r |= (a & 0x0000ffff00000000ull) >> 16;
r |= (a & 0xffff000000000000ull) >> 48;
return r;
}

uint64_t helper_memory_to_g(uint64_t a)
{
uint64_t r;
r = (a & 0x000000000000ffffull) << 48;
r |= (a & 0x00000000ffff0000ull) << 16;
r |= (a & 0x0000ffff00000000ull) >> 16;
r |= (a & 0xffff000000000000ull) >> 48;
return r;
}

uint64_t helper_addg(CPUAlphaState *env, uint64_t a, uint64_t b)
{
float64 fa, fb, fr;

fa = g_to_float64(env, GETPC(), a);
fb = g_to_float64(env, GETPC(), b);
fr = float64_add(fa, fb, &FP_STATUS);
return float64_to_g(fr);
}

uint64_t helper_subg(CPUAlphaState *env, uint64_t a, uint64_t b)
{
float64 fa, fb, fr;

fa = g_to_float64(env, GETPC(), a);
fb = g_to_float64(env, GETPC(), b);
fr = float64_sub(fa, fb, &FP_STATUS);
return float64_to_g(fr);
}

uint64_t helper_mulg(CPUAlphaState *env, uint64_t a, uint64_t b)
{
float64 fa, fb, fr;

fa = g_to_float64(env, GETPC(), a);
fb = g_to_float64(env, GETPC(), b);
fr = float64_mul(fa, fb, &FP_STATUS);
return float64_to_g(fr);
}

uint64_t helper_divg(CPUAlphaState *env, uint64_t a, uint64_t b)
{
float64 fa, fb, fr;

fa = g_to_float64(env, GETPC(), a);
fb = g_to_float64(env, GETPC(), b);
fr = float64_div(fa, fb, &FP_STATUS);
return float64_to_g(fr);
}

uint64_t helper_sqrtg(CPUAlphaState *env, uint64_t a)
{
float64 fa, fr;

fa = g_to_float64(env, GETPC(), a);
fr = float64_sqrt(fa, &FP_STATUS);
return float64_to_g(fr);
}


/* S floating (single) */

Expand Down Expand Up @@ -613,48 +356,6 @@ uint64_t helper_cmptlt(CPUAlphaState *env, uint64_t a, uint64_t b)
}
}

uint64_t helper_cmpgeq(CPUAlphaState *env, uint64_t a, uint64_t b)
{
float64 fa, fb;

fa = g_to_float64(env, GETPC(), a);
fb = g_to_float64(env, GETPC(), b);

if (float64_eq_quiet(fa, fb, &FP_STATUS)) {
return 0x4000000000000000ULL;
} else {
return 0;
}
}

uint64_t helper_cmpgle(CPUAlphaState *env, uint64_t a, uint64_t b)
{
float64 fa, fb;

fa = g_to_float64(env, GETPC(), a);
fb = g_to_float64(env, GETPC(), b);

if (float64_le(fa, fb, &FP_STATUS)) {
return 0x4000000000000000ULL;
} else {
return 0;
}
}

uint64_t helper_cmpglt(CPUAlphaState *env, uint64_t a, uint64_t b)
{
float64 fa, fb;

fa = g_to_float64(env, GETPC(), a);
fb = g_to_float64(env, GETPC(), b);

if (float64_lt(fa, fb, &FP_STATUS)) {
return 0x4000000000000000ULL;
} else {
return 0;
}
}

/* Floating point format conversion */
uint64_t helper_cvtts(CPUAlphaState *env, uint64_t a)
{
Expand Down Expand Up @@ -792,35 +493,6 @@ uint64_t helper_cvtqt(CPUAlphaState *env, uint64_t a)
return float64_to_t(fr);
}

uint64_t helper_cvtqf(CPUAlphaState *env, uint64_t a)
{
float32 fr = int64_to_float32(a, &FP_STATUS);
return float32_to_f(fr);
}

uint64_t helper_cvtgf(CPUAlphaState *env, uint64_t a)
{
float64 fa;
float32 fr;

fa = g_to_float64(env, GETPC(), a);
fr = float64_to_float32(fa, &FP_STATUS);
return float32_to_f(fr);
}

uint64_t helper_cvtgq(CPUAlphaState *env, uint64_t a)
{
float64 fa = g_to_float64(env, GETPC(), a);
return float64_to_int64_round_to_zero(fa, &FP_STATUS);
}

uint64_t helper_cvtqg(CPUAlphaState *env, uint64_t a)
{
float64 fr;
fr = int64_to_float64(a, &FP_STATUS);
return float64_to_g(fr);
}

void helper_fcvtql_v_input(CPUAlphaState *env, uint64_t val)
{
if (val != (int32_t)val) {
Expand Down
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