1 files changed, 551 insertions, 0 deletions
diff --git a/target-alpha/fpu_helper.c b/target-alpha/fpu_helper.c
new file mode 100644
index 00000000..b091aa84
--- /dev/null
+++ b/target-alpha/fpu_helper.c
@@ -0,0 +1,551 @@
+/*
+ *  Helpers for floating point instructions.
+ *
+ *  Copyright (c) 2007 Jocelyn Mayer
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cpu.h"
+#include "exec/helper-proto.h"
+#include "fpu/softfloat.h"
+
+#define FP_STATUS (env->fp_status)
+
+
+void helper_setroundmode(CPUAlphaState *env, uint32_t val)
+{
+    set_float_rounding_mode(val, &FP_STATUS);
+}
+
+void helper_setflushzero(CPUAlphaState *env, uint32_t val)
+{
+    set_flush_to_zero(val, &FP_STATUS);
+}
+
+#define CONVERT_BIT(X, SRC, DST) \
+    (SRC > DST ? (X) / (SRC / DST) & (DST) : ((X) & SRC) * (DST / SRC))
+
+static uint32_t soft_to_fpcr_exc(CPUAlphaState *env)
+{
+    uint8_t exc = get_float_exception_flags(&FP_STATUS);
+    uint32_t ret = 0;
+
+    if (unlikely(exc)) {
+        set_float_exception_flags(0, &FP_STATUS);
+        ret |= CONVERT_BIT(exc, float_flag_invalid, FPCR_INV);
+        ret |= CONVERT_BIT(exc, float_flag_divbyzero, FPCR_DZE);
+        ret |= CONVERT_BIT(exc, float_flag_overflow, FPCR_OVF);
+        ret |= CONVERT_BIT(exc, float_flag_underflow, FPCR_UNF);
+        ret |= CONVERT_BIT(exc, float_flag_inexact, FPCR_INE);
+    }
+
+    return ret;
+}
+
+static void fp_exc_raise1(CPUAlphaState *env, uintptr_t retaddr,
+                          uint32_t exc, uint32_t regno, uint32_t hw_exc)
+{
+    hw_exc |= CONVERT_BIT(exc, FPCR_INV, EXC_M_INV);
+    hw_exc |= CONVERT_BIT(exc, FPCR_DZE, EXC_M_DZE);
+    hw_exc |= CONVERT_BIT(exc, FPCR_OVF, EXC_M_FOV);
+    hw_exc |= CONVERT_BIT(exc, FPCR_UNF, EXC_M_UNF);
+    hw_exc |= CONVERT_BIT(exc, FPCR_INE, EXC_M_INE);
+    hw_exc |= CONVERT_BIT(exc, FPCR_IOV, EXC_M_IOV);
+
+    arith_excp(env, retaddr, hw_exc, 1ull << regno);
+}
+
+/* Raise exceptions for ieee fp insns without software completion.
+   In that case there are no exceptions that don't trap; the mask
+   doesn't apply.  */
+void helper_fp_exc_raise(CPUAlphaState *env, uint32_t ignore, uint32_t regno)
+{
+    uint32_t exc = env->error_code;
+    if (exc) {
+        env->fpcr |= exc;
+        exc &= ~ignore;
+        if (exc) {
+            fp_exc_raise1(env, GETPC(), exc, regno, 0);
+        }
+    }
+}
+
+/* Raise exceptions for ieee fp insns with software completion.  */
+void helper_fp_exc_raise_s(CPUAlphaState *env, uint32_t ignore, uint32_t regno)
+{
+    uint32_t exc = env->error_code & ~ignore;
+    if (exc) {
+        env->fpcr |= exc;
+        exc &= ~ignore;
+        if (exc) {
+            exc &= env->fpcr_exc_enable;
+            fp_exc_raise1(env, GETPC(), exc, regno, EXC_M_SWC);
+        }
+    }
+}
+
+/* Input handing without software completion.  Trap for all
+   non-finite numbers.  */
+void helper_ieee_input(CPUAlphaState *env, uint64_t val)
+{
+    uint32_t exp = (uint32_t)(val >> 52) & 0x7ff;
+    uint64_t frac = val & 0xfffffffffffffull;
+
+    if (exp == 0) {
+        /* Denormals without /S raise an exception.  */
+        if (frac != 0) {
+            arith_excp(env, GETPC(), EXC_M_INV, 0);
+        }
+    } else if (exp == 0x7ff) {
+        /* Infinity or NaN.  */
+        env->fpcr |= FPCR_INV;
+        arith_excp(env, GETPC(), EXC_M_INV, 0);
+    }
+}
+
+/* Similar, but does not trap for infinities.  Used for comparisons.  */
+void helper_ieee_input_cmp(CPUAlphaState *env, uint64_t val)
+{
+    uint32_t exp = (uint32_t)(val >> 52) & 0x7ff;
+    uint64_t frac = val & 0xfffffffffffffull;
+
+    if (exp == 0) {
+        /* Denormals without /S raise an exception.  */
+        if (frac != 0) {
+            arith_excp(env, GETPC(), EXC_M_INV, 0);
+        }
+    } else if (exp == 0x7ff && frac) {
+        /* NaN.  */
+        env->fpcr |= FPCR_INV;
+        arith_excp(env, GETPC(), EXC_M_INV, 0);
+    }
+}
+
+/* Input handing with software completion.  Trap for denorms, unless DNZ
+   is set.  If we try to support DNOD (which none of the produced hardware
+   did, AFAICS), we'll need to suppress the trap when FPCR.DNOD is set;
+   then the code downstream of that will need to cope with denorms sans
+   flush_input_to_zero.  Most of it should work sanely, but there's
+   nothing to compare with.  */
+void helper_ieee_input_s(CPUAlphaState *env, uint64_t val)
+{
+    if (unlikely(2 * val - 1 < 0x1fffffffffffffull)
+        && !env->fp_status.flush_inputs_to_zero) {
+        arith_excp(env, GETPC(), EXC_M_INV | EXC_M_SWC, 0);
+    }
+}
+
+/* S floating (single) */
+
+/* Taken from linux/arch/alpha/kernel/traps.c, s_mem_to_reg.  */
+static inline uint64_t float32_to_s_int(uint32_t fi)
+{
+    uint32_t frac = fi & 0x7fffff;
+    uint32_t sign = fi >> 31;
+    uint32_t exp_msb = (fi >> 30) & 1;
+    uint32_t exp_low = (fi >> 23) & 0x7f;
+    uint32_t exp;
+
+    exp = (exp_msb << 10) | exp_low;
+    if (exp_msb) {
+        if (exp_low == 0x7f) {
+            exp = 0x7ff;
+        }
+    } else {
+        if (exp_low != 0x00) {
+            exp |= 0x380;
+        }
+    }
+
+    return (((uint64_t)sign << 63)
+            | ((uint64_t)exp << 52)
+            | ((uint64_t)frac << 29));
+}
+
+static inline uint64_t float32_to_s(float32 fa)
+{
+    CPU_FloatU a;
+    a.f = fa;
+    return float32_to_s_int(a.l);
+}
+
+static inline uint32_t s_to_float32_int(uint64_t a)
+{
+    return ((a >> 32) & 0xc0000000) | ((a >> 29) & 0x3fffffff);
+}
+
+static inline float32 s_to_float32(uint64_t a)
+{
+    CPU_FloatU r;
+    r.l = s_to_float32_int(a);
+    return r.f;
+}
+
+uint32_t helper_s_to_memory(uint64_t a)
+{
+    return s_to_float32_int(a);
+}
+
+uint64_t helper_memory_to_s(uint32_t a)
+{
+    return float32_to_s_int(a);
+}
+
+uint64_t helper_adds(CPUAlphaState *env, uint64_t a, uint64_t b)
+{
+    float32 fa, fb, fr;
+
+    fa = s_to_float32(a);
+    fb = s_to_float32(b);
+    fr = float32_add(fa, fb, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return float32_to_s(fr);
+}
+
+uint64_t helper_subs(CPUAlphaState *env, uint64_t a, uint64_t b)
+{
+    float32 fa, fb, fr;
+
+    fa = s_to_float32(a);
+    fb = s_to_float32(b);
+    fr = float32_sub(fa, fb, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return float32_to_s(fr);
+}
+
+uint64_t helper_muls(CPUAlphaState *env, uint64_t a, uint64_t b)
+{
+    float32 fa, fb, fr;
+
+    fa = s_to_float32(a);
+    fb = s_to_float32(b);
+    fr = float32_mul(fa, fb, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return float32_to_s(fr);
+}
+
+uint64_t helper_divs(CPUAlphaState *env, uint64_t a, uint64_t b)
+{
+    float32 fa, fb, fr;
+
+    fa = s_to_float32(a);
+    fb = s_to_float32(b);
+    fr = float32_div(fa, fb, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return float32_to_s(fr);
+}
+
+uint64_t helper_sqrts(CPUAlphaState *env, uint64_t a)
+{
+    float32 fa, fr;
+
+    fa = s_to_float32(a);
+    fr = float32_sqrt(fa, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return float32_to_s(fr);
+}
+
+
+/* T floating (double) */
+static inline float64 t_to_float64(uint64_t a)
+{
+    /* Memory format is the same as float64 */
+    CPU_DoubleU r;
+    r.ll = a;
+    return r.d;
+}
+
+static inline uint64_t float64_to_t(float64 fa)
+{
+    /* Memory format is the same as float64 */
+    CPU_DoubleU r;
+    r.d = fa;
+    return r.ll;
+}
+
+uint64_t helper_addt(CPUAlphaState *env, uint64_t a, uint64_t b)
+{
+    float64 fa, fb, fr;
+
+    fa = t_to_float64(a);
+    fb = t_to_float64(b);
+    fr = float64_add(fa, fb, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return float64_to_t(fr);
+}
+
+uint64_t helper_subt(CPUAlphaState *env, uint64_t a, uint64_t b)
+{
+    float64 fa, fb, fr;
+
+    fa = t_to_float64(a);
+    fb = t_to_float64(b);
+    fr = float64_sub(fa, fb, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return float64_to_t(fr);
+}
+
+uint64_t helper_mult(CPUAlphaState *env, uint64_t a, uint64_t b)
+{
+    float64 fa, fb, fr;
+
+    fa = t_to_float64(a);
+    fb = t_to_float64(b);
+    fr = float64_mul(fa, fb, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return float64_to_t(fr);
+}
+
+uint64_t helper_divt(CPUAlphaState *env, uint64_t a, uint64_t b)
+{
+    float64 fa, fb, fr;
+
+    fa = t_to_float64(a);
+    fb = t_to_float64(b);
+    fr = float64_div(fa, fb, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return float64_to_t(fr);
+}
+
+uint64_t helper_sqrtt(CPUAlphaState *env, uint64_t a)
+{
+    float64 fa, fr;
+
+    fa = t_to_float64(a);
+    fr = float64_sqrt(fa, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return float64_to_t(fr);
+}
+
+/* Comparisons */
+uint64_t helper_cmptun(CPUAlphaState *env, uint64_t a, uint64_t b)
+{
+    float64 fa, fb;
+    uint64_t ret = 0;
+
+    fa = t_to_float64(a);
+    fb = t_to_float64(b);
+
+    if (float64_unordered_quiet(fa, fb, &FP_STATUS)) {
+        ret = 0x4000000000000000ULL;
+    }
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return ret;
+}
+
+uint64_t helper_cmpteq(CPUAlphaState *env, uint64_t a, uint64_t b)
+{
+    float64 fa, fb;
+    uint64_t ret = 0;
+
+    fa = t_to_float64(a);
+    fb = t_to_float64(b);
+
+    if (float64_eq_quiet(fa, fb, &FP_STATUS)) {
+        ret = 0x4000000000000000ULL;
+    }
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return ret;
+}
+
+uint64_t helper_cmptle(CPUAlphaState *env, uint64_t a, uint64_t b)
+{
+    float64 fa, fb;
+    uint64_t ret = 0;
+
+    fa = t_to_float64(a);
+    fb = t_to_float64(b);
+
+    if (float64_le(fa, fb, &FP_STATUS)) {
+        ret = 0x4000000000000000ULL;
+    }
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return ret;
+}
+
+uint64_t helper_cmptlt(CPUAlphaState *env, uint64_t a, uint64_t b)
+{
+    float64 fa, fb;
+    uint64_t ret = 0;
+
+    fa = t_to_float64(a);
+    fb = t_to_float64(b);
+
+    if (float64_lt(fa, fb, &FP_STATUS)) {
+        ret = 0x4000000000000000ULL;
+    }
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return ret;
+}
+
+/* Floating point format conversion */
+uint64_t helper_cvtts(CPUAlphaState *env, uint64_t a)
+{
+    float64 fa;
+    float32 fr;
+
+    fa = t_to_float64(a);
+    fr = float64_to_float32(fa, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return float32_to_s(fr);
+}
+
+uint64_t helper_cvtst(CPUAlphaState *env, uint64_t a)
+{
+    float32 fa;
+    float64 fr;
+
+    fa = s_to_float32(a);
+    fr = float32_to_float64(fa, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return float64_to_t(fr);
+}
+
+uint64_t helper_cvtqs(CPUAlphaState *env, uint64_t a)
+{
+    float32 fr = int64_to_float32(a, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return float32_to_s(fr);
+}
+
+/* Implement float64 to uint64 conversion without saturation -- we must
+   supply the truncated result.  This behaviour is used by the compiler
+   to get unsigned conversion for free with the same instruction.  */
+
+static uint64_t do_cvttq(CPUAlphaState *env, uint64_t a, int roundmode)
+{
+    uint64_t frac, ret = 0;
+    uint32_t exp, sign, exc = 0;
+    int shift;
+
+    sign = (a >> 63);
+    exp = (uint32_t)(a >> 52) & 0x7ff;
+    frac = a & 0xfffffffffffffull;
+
+    if (exp == 0) {
+        if (unlikely(frac != 0) && !env->fp_status.flush_inputs_to_zero) {
+            goto do_underflow;
+        }
+    } else if (exp == 0x7ff) {
+        exc = FPCR_INV;
+    } else {
+        /* Restore implicit bit.  */
+        frac |= 0x10000000000000ull;
+
+        shift = exp - 1023 - 52;
+        if (shift >= 0) {
+            /* In this case the number is so large that we must shift
+               the fraction left.  There is no rounding to do.  */
+            if (shift < 64) {
+                ret = frac << shift;
+            }
+            /* Check for overflow.  Note the special case of -0x1p63.  */
+            if (shift >= 11 && a != 0xC3E0000000000000ull) {
+                exc = FPCR_IOV | FPCR_INE;
+            }
+        } else {
+            uint64_t round;
+
+            /* In this case the number is smaller than the fraction as
+               represented by the 52 bit number.  Here we must think
+               about rounding the result.  Handle this by shifting the
+               fractional part of the number into the high bits of ROUND.
+               This will let us efficiently handle round-to-nearest.  */
+            shift = -shift;
+            if (shift < 63) {
+                ret = frac >> shift;
+                round = frac << (64 - shift);
+            } else {
+                /* The exponent is so small we shift out everything.
+                   Leave a sticky bit for proper rounding below.  */
+            do_underflow:
+                round = 1;
+            }
+
+            if (round) {
+                exc = FPCR_INE;
+                switch (roundmode) {
+                case float_round_nearest_even:
+                    if (round == (1ull << 63)) {
+                        /* Fraction is exactly 0.5; round to even.  */
+                        ret += (ret & 1);
+                    } else if (round > (1ull << 63)) {
+                        ret += 1;
+                    }
+                    break;
+                case float_round_to_zero:
+                    break;
+                case float_round_up:
+                    ret += 1 - sign;
+                    break;
+                case float_round_down:
+                    ret += sign;
+                    break;
+                }
+            }
+        }
+        if (sign) {
+            ret = -ret;
+        }
+    }
+    env->error_code = exc;
+
+    return ret;
+}
+
+uint64_t helper_cvttq(CPUAlphaState *env, uint64_t a)
+{
+    return do_cvttq(env, a, FP_STATUS.float_rounding_mode);
+}
+
+uint64_t helper_cvttq_c(CPUAlphaState *env, uint64_t a)
+{
+    return do_cvttq(env, a, float_round_to_zero);
+}
+
+uint64_t helper_cvtqt(CPUAlphaState *env, uint64_t a)
+{
+    float64 fr = int64_to_float64(a, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+    return float64_to_t(fr);
+}
+
+uint64_t helper_cvtql(CPUAlphaState *env, uint64_t val)
+{
+    uint32_t exc = 0;
+    if (val != (int32_t)val) {
+        exc = FPCR_IOV | FPCR_INE;
+    }
+    env->error_code = exc;
+
+    return ((val & 0xc0000000) << 32) | ((val & 0x3fffffff) << 29);
+}