target-alpha: Tidy FPCR representation

Store the fpcr as the hardware represents it.  Convert the softfpu
representation of exceptions into the fpcr representation.

Signed-off-by: Richard Henderson <rth@twiddle.net>

5 files changed, 159 insertions, 243 deletions

diff --git a/target-alpha/cpu.h b/target-alpha/cpu.h
index 9538f19..2a4d5cb 100644
--- a/target-alpha/cpu.h
+++ b/target-alpha/cpu.h
@@ -150,54 +150,54 @@ enum {
     FP_ROUND_DYNAMIC = 0x3,
 };
 
-/* FPCR bits */
-#define FPCR_SUM		(1ULL << 63)
-#define FPCR_INED		(1ULL << 62)
-#define FPCR_UNFD		(1ULL << 61)
-#define FPCR_UNDZ		(1ULL << 60)
-#define FPCR_DYN_SHIFT		58
-#define FPCR_DYN_CHOPPED	(0ULL << FPCR_DYN_SHIFT)
-#define FPCR_DYN_MINUS		(1ULL << FPCR_DYN_SHIFT)
-#define FPCR_DYN_NORMAL		(2ULL << FPCR_DYN_SHIFT)
-#define FPCR_DYN_PLUS		(3ULL << FPCR_DYN_SHIFT)
-#define FPCR_DYN_MASK		(3ULL << FPCR_DYN_SHIFT)
-#define FPCR_IOV		(1ULL << 57)
-#define FPCR_INE		(1ULL << 56)
-#define FPCR_UNF		(1ULL << 55)
-#define FPCR_OVF		(1ULL << 54)
-#define FPCR_DZE		(1ULL << 53)
-#define FPCR_INV		(1ULL << 52)
-#define FPCR_OVFD		(1ULL << 51)
-#define FPCR_DZED		(1ULL << 50)
-#define FPCR_INVD		(1ULL << 49)
-#define FPCR_DNZ		(1ULL << 48)
-#define FPCR_DNOD		(1ULL << 47)
-#define FPCR_STATUS_MASK	(FPCR_IOV | FPCR_INE | FPCR_UNF \
-				 | FPCR_OVF | FPCR_DZE | FPCR_INV)
+/* FPCR bits -- right-shifted 32 so we can use a uint32_t.  */
+#define FPCR_SUM                (1U << (63 - 32))
+#define FPCR_INED               (1U << (62 - 32))
+#define FPCR_UNFD               (1U << (61 - 32))
+#define FPCR_UNDZ               (1U << (60 - 32))
+#define FPCR_DYN_SHIFT          (58 - 32)
+#define FPCR_DYN_CHOPPED        (0U << FPCR_DYN_SHIFT)
+#define FPCR_DYN_MINUS          (1U << FPCR_DYN_SHIFT)
+#define FPCR_DYN_NORMAL         (2U << FPCR_DYN_SHIFT)
+#define FPCR_DYN_PLUS           (3U << FPCR_DYN_SHIFT)
+#define FPCR_DYN_MASK           (3U << FPCR_DYN_SHIFT)
+#define FPCR_IOV                (1U << (57 - 32))
+#define FPCR_INE                (1U << (56 - 32))
+#define FPCR_UNF                (1U << (55 - 32))
+#define FPCR_OVF                (1U << (54 - 32))
+#define FPCR_DZE                (1U << (53 - 32))
+#define FPCR_INV                (1U << (52 - 32))
+#define FPCR_OVFD               (1U << (51 - 32))
+#define FPCR_DZED               (1U << (50 - 32))
+#define FPCR_INVD               (1U << (49 - 32))
+#define FPCR_DNZ                (1U << (48 - 32))
+#define FPCR_DNOD               (1U << (47 - 32))
+#define FPCR_STATUS_MASK        (FPCR_IOV | FPCR_INE | FPCR_UNF \
+                                 | FPCR_OVF | FPCR_DZE | FPCR_INV)
 
 /* The silly software trap enables implemented by the kernel emulation.
    These are more or less architecturally required, since the real hardware
    has read-as-zero bits in the FPCR when the features aren't implemented.
    For the purposes of QEMU, we pretend the FPCR can hold everything.  */
-#define SWCR_TRAP_ENABLE_INV	(1ULL << 1)
-#define SWCR_TRAP_ENABLE_DZE	(1ULL << 2)
-#define SWCR_TRAP_ENABLE_OVF	(1ULL << 3)
-#define SWCR_TRAP_ENABLE_UNF	(1ULL << 4)
-#define SWCR_TRAP_ENABLE_INE	(1ULL << 5)
-#define SWCR_TRAP_ENABLE_DNO	(1ULL << 6)
-#define SWCR_TRAP_ENABLE_MASK	((1ULL << 7) - (1ULL << 1))
-
-#define SWCR_MAP_DMZ		(1ULL << 12)
-#define SWCR_MAP_UMZ		(1ULL << 13)
-#define SWCR_MAP_MASK		(SWCR_MAP_DMZ | SWCR_MAP_UMZ)
-
-#define SWCR_STATUS_INV		(1ULL << 17)
-#define SWCR_STATUS_DZE		(1ULL << 18)
-#define SWCR_STATUS_OVF		(1ULL << 19)
-#define SWCR_STATUS_UNF		(1ULL << 20)
-#define SWCR_STATUS_INE		(1ULL << 21)
-#define SWCR_STATUS_DNO		(1ULL << 22)
-#define SWCR_STATUS_MASK	((1ULL << 23) - (1ULL << 17))
+#define SWCR_TRAP_ENABLE_INV    (1U << 1)
+#define SWCR_TRAP_ENABLE_DZE    (1U << 2)
+#define SWCR_TRAP_ENABLE_OVF    (1U << 3)
+#define SWCR_TRAP_ENABLE_UNF    (1U << 4)
+#define SWCR_TRAP_ENABLE_INE    (1U << 5)
+#define SWCR_TRAP_ENABLE_DNO    (1U << 6)
+#define SWCR_TRAP_ENABLE_MASK   ((1U << 7) - (1U << 1))
+
+#define SWCR_MAP_DMZ            (1U << 12)
+#define SWCR_MAP_UMZ            (1U << 13)
+#define SWCR_MAP_MASK           (SWCR_MAP_DMZ | SWCR_MAP_UMZ)
+
+#define SWCR_STATUS_INV         (1U << 17)
+#define SWCR_STATUS_DZE         (1U << 18)
+#define SWCR_STATUS_OVF         (1U << 19)
+#define SWCR_STATUS_UNF         (1U << 20)
+#define SWCR_STATUS_INE         (1U << 21)
+#define SWCR_STATUS_DNO         (1U << 22)
+#define SWCR_STATUS_MASK        ((1U << 23) - (1U << 17))
 
 #define SWCR_MASK  (SWCR_TRAP_ENABLE_MASK | SWCR_MAP_MASK | SWCR_STATUS_MASK)
 
@@ -238,14 +238,13 @@ struct CPUAlphaState {
     uint64_t lock_addr;
     uint64_t lock_st_addr;
     uint64_t lock_value;
+
+    /* The FPCR, and disassembled portions thereof.  */
+    uint32_t fpcr;
+    uint32_t fpcr_exc_enable;
     float_status fp_status;
-    /* The following fields make up the FPCR, but in FP_STATUS format.  */
-    uint8_t fpcr_exc_status;
-    uint8_t fpcr_exc_mask;
     uint8_t fpcr_dyn_round;
     uint8_t fpcr_flush_to_zero;
-    uint8_t fpcr_dnod;
-    uint8_t fpcr_undz;
 
     /* The Internal Processor Registers.  Some of these we assume always
        exist for use in user-mode.  */
diff --git a/target-alpha/fpu_helper.c b/target-alpha/fpu_helper.c
index 119559a..caf8317 100644
--- a/target-alpha/fpu_helper.c
+++ b/target-alpha/fpu_helper.c
@@ -34,37 +34,38 @@ void helper_setflushzero(CPUAlphaState *env, uint32_t val)
     set_flush_to_zero(val, &FP_STATUS);
 }
 
-void helper_fp_exc_clear(CPUAlphaState *env)
-{
-    set_float_exception_flags(0, &FP_STATUS);
-}
+#define CONVERT_BIT(X, SRC, DST) \
+    (SRC > DST ? (X) / (SRC / DST) & (DST) : ((X) & SRC) * (DST / SRC))
 
-uint32_t helper_fp_exc_get(CPUAlphaState *env)
+static uint32_t soft_to_fpcr_exc(CPUAlphaState *env)
 {
-    return get_float_exception_flags(&FP_STATUS);
+    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 inline void inline_fp_exc_raise(CPUAlphaState *env, uintptr_t retaddr,
-                                       uint32_t exc, uint32_t regno)
+static void fp_exc_raise1(CPUAlphaState *env, uintptr_t retaddr,
+                          uint32_t exc, uint32_t regno)
 {
     if (exc) {
         uint32_t hw_exc = 0;
 
-        if (exc & float_flag_invalid) {
-            hw_exc |= EXC_M_INV;
-        }
-        if (exc & float_flag_divbyzero) {
-            hw_exc |= EXC_M_DZE;
-        }
-        if (exc & float_flag_overflow) {
-            hw_exc |= EXC_M_FOV;
-        }
-        if (exc & float_flag_underflow) {
-            hw_exc |= EXC_M_UNF;
-        }
-        if (exc & float_flag_inexact) {
-            hw_exc |= EXC_M_INE;
-        }
+        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);
     }
@@ -73,18 +74,20 @@ static inline void inline_fp_exc_raise(CPUAlphaState *env, uintptr_t retaddr,
 /* 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 exc, uint32_t regno)
+void helper_fp_exc_raise(CPUAlphaState *env, uint32_t ignore, uint32_t regno)
 {
-    inline_fp_exc_raise(env, GETPC(), exc, regno);
+    uint32_t exc = env->error_code & ~ignore;
+    fp_exc_raise1(env, GETPC(), exc, regno);
 }
 
 /* Raise exceptions for ieee fp insns with software completion.  */
-void helper_fp_exc_raise_s(CPUAlphaState *env, uint32_t exc, uint32_t regno)
+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_status |= exc;
-        exc &= ~env->fpcr_exc_mask;
-        inline_fp_exc_raise(env, GETPC(), exc, regno);
+        env->fpcr |= exc;
+        exc &= env->fpcr_exc_enable;
+        fp_exc_raise1(env, GETPC(), exc, regno);
     }
 }
 
@@ -190,6 +193,8 @@ uint64_t helper_adds(CPUAlphaState *env, uint64_t a, uint64_t b)
     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);
 }
 
@@ -200,6 +205,8 @@ uint64_t helper_subs(CPUAlphaState *env, uint64_t a, uint64_t b)
     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);
 }
 
@@ -210,6 +217,8 @@ uint64_t helper_muls(CPUAlphaState *env, uint64_t a, uint64_t b)
     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);
 }
 
@@ -220,6 +229,8 @@ uint64_t helper_divs(CPUAlphaState *env, uint64_t a, uint64_t b)
     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);
 }
 
@@ -229,6 +240,8 @@ uint64_t helper_sqrts(CPUAlphaState *env, uint64_t a)
 
     fa = s_to_float32(a);
     fr = float32_sqrt(fa, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
     return float32_to_s(fr);
 }
 
@@ -257,6 +270,8 @@ uint64_t helper_addt(CPUAlphaState *env, uint64_t a, uint64_t b)
     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);
 }
 
@@ -267,6 +282,8 @@ uint64_t helper_subt(CPUAlphaState *env, uint64_t a, uint64_t b)
     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);
 }
 
@@ -277,6 +294,8 @@ uint64_t helper_mult(CPUAlphaState *env, uint64_t a, uint64_t b)
     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);
 }
 
@@ -287,6 +306,8 @@ uint64_t helper_divt(CPUAlphaState *env, uint64_t a, uint64_t b)
     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);
 }
 
@@ -296,6 +317,8 @@ uint64_t helper_sqrtt(CPUAlphaState *env, uint64_t a)
 
     fa = t_to_float64(a);
     fr = float64_sqrt(fa, &FP_STATUS);
+    env->error_code = soft_to_fpcr_exc(env);
+
     return float64_to_t(fr);
 }
 
@@ -303,57 +326,65 @@ uint64_t helper_sqrtt(CPUAlphaState *env, uint64_t a)
 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)) {
-        return 0x4000000000000000ULL;
-    } else {
-        return 0;
+        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)) {
-        return 0x4000000000000000ULL;
-    } else {
-        return 0;
+        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)) {
-        return 0x4000000000000000ULL;
-    } else {
-        return 0;
+        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)) {
-        return 0x4000000000000000ULL;
-    } else {
-        return 0;
+        ret = 0x4000000000000000ULL;
     }
+    env->error_code = soft_to_fpcr_exc(env);
+
+    return ret;
 }
 
 /* Floating point format conversion */
@@ -364,6 +395,8 @@ uint64_t helper_cvtts(CPUAlphaState *env, uint64_t a)
 
     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);
 }
 
@@ -374,12 +407,16 @@ uint64_t helper_cvtst(CPUAlphaState *env, uint64_t a)
 
     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);
 }
 
@@ -405,7 +442,7 @@ static inline uint64_t inline_cvttq(CPUAlphaState *env, uint64_t a,
             goto do_underflow;
         }
     } else if (exp == 0x7ff) {
-        exc = (frac ? float_flag_invalid : VI ? float_flag_overflow : 0);
+        exc = (frac ? FPCR_INV : VI ? FPCR_OVF : 0);
     } else {
         /* Restore implicit bit.  */
         frac |= 0x10000000000000ull;
@@ -417,7 +454,7 @@ static inline uint64_t inline_cvttq(CPUAlphaState *env, uint64_t a,
             if (shift < 63) {
                 ret = frac << shift;
                 if (VI && (ret >> shift) != frac) {
-                    exc = float_flag_overflow;
+                    exc = FPCR_OVF;
                 }
             }
         } else {
@@ -440,7 +477,7 @@ static inline uint64_t inline_cvttq(CPUAlphaState *env, uint64_t a,
             }
 
             if (round) {
-                exc = (VI ? float_flag_inexact : 0);
+                exc = (VI ? FPCR_INE : 0);
                 switch (roundmode) {
                 case float_round_nearest_even:
                     if (round == (1ull << 63)) {
@@ -465,9 +502,7 @@ static inline uint64_t inline_cvttq(CPUAlphaState *env, uint64_t a,
             ret = -ret;
         }
     }
-    if (unlikely(exc)) {
-        float_raise(exc, &FP_STATUS);
-    }
+    env->error_code = exc;
 
     return ret;
 }
@@ -490,6 +525,7 @@ uint64_t helper_cvttq_svic(CPUAlphaState *env, uint64_t a)
 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);
 }
 
diff --git a/target-alpha/helper.c b/target-alpha/helper.c
index e202fee..46b8ef9 100644
--- a/target-alpha/helper.c
+++ b/target-alpha/helper.c
@@ -25,136 +25,48 @@
 #include "fpu/softfloat.h"
 #include "exec/helper-proto.h"
 
-uint64_t cpu_alpha_load_fpcr (CPUAlphaState *env)
-{
-    uint64_t r = 0;
-    uint8_t t;
-
-    t = env->fpcr_exc_status;
-    if (t) {
-        r = FPCR_SUM;
-        if (t & float_flag_invalid) {
-            r |= FPCR_INV;
-        }
-        if (t & float_flag_divbyzero) {
-            r |= FPCR_DZE;
-        }
-        if (t & float_flag_overflow) {
-            r |= FPCR_OVF;
-        }
-        if (t & float_flag_underflow) {
-            r |= FPCR_UNF;
-        }
-        if (t & float_flag_inexact) {
-            r |= FPCR_INE;
-        }
-    }
 
-    t = env->fpcr_exc_mask;
-    if (t & float_flag_invalid) {
-        r |= FPCR_INVD;
-    }
-    if (t & float_flag_divbyzero) {
-        r |= FPCR_DZED;
-    }
-    if (t & float_flag_overflow) {
-        r |= FPCR_OVFD;
-    }
-    if (t & float_flag_underflow) {
-        r |= FPCR_UNFD;
-    }
-    if (t & float_flag_inexact) {
-        r |= FPCR_INED;
-    }
-
-    switch (env->fpcr_dyn_round) {
-    case float_round_nearest_even:
-        r |= FPCR_DYN_NORMAL;
-        break;
-    case float_round_down:
-        r |= FPCR_DYN_MINUS;
-        break;
-    case float_round_up:
-        r |= FPCR_DYN_PLUS;
-        break;
-    case float_round_to_zero:
-        r |= FPCR_DYN_CHOPPED;
-        break;
-    }
-
-    if (env->fp_status.flush_inputs_to_zero) {
-        r |= FPCR_DNZ;
-    }
-    if (env->fpcr_dnod) {
-        r |= FPCR_DNOD;
-    }
-    if (env->fpcr_undz) {
-        r |= FPCR_UNDZ;
-    }
+#define CONVERT_BIT(X, SRC, DST) \
+    (SRC > DST ? (X) / (SRC / DST) & (DST) : ((X) & SRC) * (DST / SRC))
 
-    return r;
+uint64_t cpu_alpha_load_fpcr (CPUAlphaState *env)
+{
+    return (uint64_t)env->fpcr << 32;
 }
 
 void cpu_alpha_store_fpcr (CPUAlphaState *env, uint64_t val)
 {
-    uint8_t t;
+    uint32_t fpcr = val >> 32;
+    uint32_t t = 0;
 
-    t = 0;
-    if (val & FPCR_INV) {
-        t |= float_flag_invalid;
-    }
-    if (val & FPCR_DZE) {
-        t |= float_flag_divbyzero;
-    }
-    if (val & FPCR_OVF) {
-        t |= float_flag_overflow;
-    }
-    if (val & FPCR_UNF) {
-        t |= float_flag_underflow;
-    }
-    if (val & FPCR_INE) {
-        t |= float_flag_inexact;
-    }
-    env->fpcr_exc_status = t;
+    t |= CONVERT_BIT(fpcr, FPCR_INED, FPCR_INE);
+    t |= CONVERT_BIT(fpcr, FPCR_UNFD, FPCR_UNF);
+    t |= CONVERT_BIT(fpcr, FPCR_OVFD, FPCR_OVF);
+    t |= CONVERT_BIT(fpcr, FPCR_DZED, FPCR_DZE);
+    t |= CONVERT_BIT(fpcr, FPCR_INVD, FPCR_INV);
 
-    t = 0;
-    if (val & FPCR_INVD) {
-        t |= float_flag_invalid;
-    }
-    if (val & FPCR_DZED) {
-        t |= float_flag_divbyzero;
-    }
-    if (val & FPCR_OVFD) {
-        t |= float_flag_overflow;
-    }
-    if (val & FPCR_UNFD) {
-        t |= float_flag_underflow;
-    }
-    if (val & FPCR_INED) {
-        t |= float_flag_inexact;
-    }
-    env->fpcr_exc_mask = t;
+    env->fpcr = fpcr;
+    env->fpcr_exc_enable = ~t & FPCR_STATUS_MASK;
 
-    switch (val & FPCR_DYN_MASK) {
+    switch (fpcr & FPCR_DYN_MASK) {
+    case FPCR_DYN_NORMAL:
+    default:
+        t = float_round_nearest_even;
+        break;
     case FPCR_DYN_CHOPPED:
         t = float_round_to_zero;
         break;
     case FPCR_DYN_MINUS:
         t = float_round_down;
         break;
-    case FPCR_DYN_NORMAL:
-        t = float_round_nearest_even;
-        break;
     case FPCR_DYN_PLUS:
         t = float_round_up;
         break;
     }
     env->fpcr_dyn_round = t;
 
-    env->fpcr_dnod = (val & FPCR_DNOD) != 0;
-    env->fpcr_undz = (val & FPCR_UNDZ) != 0;
-    env->fpcr_flush_to_zero = env->fpcr_dnod & env->fpcr_undz;
-    env->fp_status.flush_inputs_to_zero = (val & FPCR_DNZ) != 0;
+    env->fpcr_flush_to_zero = (fpcr & FPCR_UNFD) && (fpcr & FPCR_UNDZ);
+    env->fp_status.flush_inputs_to_zero = (fpcr & FPCR_DNZ) != 0;
 }
 
 uint64_t helper_load_fpcr(CPUAlphaState *env)
diff --git a/target-alpha/helper.h b/target-alpha/helper.h
index 424ea49..67a6e32 100644
--- a/target-alpha/helper.h
+++ b/target-alpha/helper.h
@@ -87,8 +87,6 @@ DEF_HELPER_FLAGS_2(cvttq_svic, TCG_CALL_NO_RWG, i64, env, i64)
 
 DEF_HELPER_FLAGS_2(setroundmode, TCG_CALL_NO_RWG, void, env, i32)
 DEF_HELPER_FLAGS_2(setflushzero, TCG_CALL_NO_RWG, void, env, i32)
-DEF_HELPER_FLAGS_1(fp_exc_clear, TCG_CALL_NO_RWG, void, env)
-DEF_HELPER_FLAGS_1(fp_exc_get, TCG_CALL_NO_RWG_SE, i32, env)
 DEF_HELPER_FLAGS_3(fp_exc_raise, TCG_CALL_NO_WG, void, env, i32, i32)
 DEF_HELPER_FLAGS_3(fp_exc_raise_s, TCG_CALL_NO_WG, void, env, i32, i32)
 
diff --git a/target-alpha/translate.c b/target-alpha/translate.c
index 94dab26..25107f9 100644
--- a/target-alpha/translate.c
+++ b/target-alpha/translate.c
@@ -663,18 +663,6 @@ static TCGv gen_ieee_input(DisasContext *ctx, int reg, int fn11, int is_cmp)
     return val;
 }
 
-static void gen_fp_exc_clear(void)
-{
-#if defined(CONFIG_SOFTFLOAT_INLINE)
-    TCGv_i32 zero = tcg_const_i32(0);
-    tcg_gen_st8_i32(zero, cpu_env,
-                    offsetof(CPUAlphaState, fp_status.float_exception_flags));
-    tcg_temp_free_i32(zero);
-#else
-    gen_helper_fp_exc_clear(cpu_env);
-#endif
-}
-
 static void gen_fp_exc_raise_ignore(int rc, int fn11, int ignore)
 {
     /* ??? We ought to be able to do something with imprecise exceptions.
@@ -682,20 +670,9 @@ static void gen_fp_exc_raise_ignore(int rc, int fn11, int ignore)
        TB and do not generate the code to signal the exception; end the TB
        when an exception is forced to arrive, either by consumption of a
        register value or TRAPB or EXCB.  */
-    TCGv_i32 exc = tcg_temp_new_i32();
+    TCGv_i32 ign = tcg_const_i32(ignore);
     TCGv_i32 reg;
 
-#if defined(CONFIG_SOFTFLOAT_INLINE)
-    tcg_gen_ld8u_i32(exc, cpu_env,
-                     offsetof(CPUAlphaState, fp_status.float_exception_flags));
-#else
-    gen_helper_fp_exc_get(exc, cpu_env);
-#endif
-
-    if (ignore) {
-        tcg_gen_andi_i32(exc, exc, ~ignore);
-    }
-
     /* ??? Pass in the regno of the destination so that the helper can
        set EXC_MASK, which contains a bitmask of destination registers
        that have caused arithmetic traps.  A simple userspace emulation
@@ -704,18 +681,18 @@ static void gen_fp_exc_raise_ignore(int rc, int fn11, int ignore)
     reg = tcg_const_i32(rc + 32);
 
     if (fn11 & QUAL_S) {
-        gen_helper_fp_exc_raise_s(cpu_env, exc, reg);
+        gen_helper_fp_exc_raise_s(cpu_env, ign, reg);
     } else {
-        gen_helper_fp_exc_raise(cpu_env, exc, reg);
+        gen_helper_fp_exc_raise(cpu_env, ign, reg);
     }
 
     tcg_temp_free_i32(reg);
-    tcg_temp_free_i32(exc);
+    tcg_temp_free_i32(ign);
 }
 
 static inline void gen_fp_exc_raise(int rc, int fn11)
 {
-    gen_fp_exc_raise_ignore(rc, fn11, fn11 & QUAL_I ? 0 : float_flag_inexact);
+    gen_fp_exc_raise_ignore(rc, fn11, fn11 & QUAL_I ? 0 : FPCR_INE);
 }
 
 static void gen_cvtlq(TCGv vc, TCGv vb)
@@ -754,7 +731,6 @@ static void gen_ieee_arith2(DisasContext *ctx,
 
     gen_qual_roundmode(ctx, fn11);
     gen_qual_flushzero(ctx, fn11);
-    gen_fp_exc_clear();
 
     vb = gen_ieee_input(ctx, rb, fn11, 0);
     helper(dest_fpr(ctx, rc), cpu_env, vb);
@@ -779,7 +755,6 @@ static void gen_cvttq(DisasContext *ctx, int rb, int rc, int fn11)
     int ignore = 0;
 
     /* No need to set flushzero, since we have an integer output.  */
-    gen_fp_exc_clear();
     vb = gen_ieee_input(ctx, rb, fn11, 0);
     vc = dest_fpr(ctx, rc);
 
@@ -791,7 +766,7 @@ static void gen_cvttq(DisasContext *ctx, int rb, int rc, int fn11)
         break;
     case QUAL_V | QUAL_RM_C:
     case QUAL_S | QUAL_V | QUAL_RM_C:
-        ignore = float_flag_inexact;
+        ignore = FPCR_INE;
         /* FALLTHRU */
     case QUAL_S | QUAL_V | QUAL_I | QUAL_RM_C:
         gen_helper_cvttq_svic(vc, cpu_env, vb);
@@ -799,8 +774,8 @@ static void gen_cvttq(DisasContext *ctx, int rb, int rc, int fn11)
     default:
         gen_qual_roundmode(ctx, fn11);
         gen_helper_cvttq(vc, cpu_env, vb);
-        ignore |= (fn11 & QUAL_V ? 0 : float_flag_overflow);
-        ignore |= (fn11 & QUAL_I ? 0 : float_flag_inexact);
+        ignore |= (fn11 & QUAL_V ? 0 : FPCR_IOV);
+        ignore |= (fn11 & QUAL_I ? 0 : FPCR_INE);
         break;
     }
 
@@ -821,7 +796,6 @@ static void gen_ieee_intcvt(DisasContext *ctx,
        is inexact.  Thus we only need to worry about exceptions when
        inexact handling is requested.  */
     if (fn11 & QUAL_I) {
-        gen_fp_exc_clear();
         helper(vc, cpu_env, vb);
         gen_fp_exc_raise(rc, fn11);
     } else {
@@ -864,7 +838,6 @@ static void gen_ieee_arith3(DisasContext *ctx,
 
     gen_qual_roundmode(ctx, fn11);
     gen_qual_flushzero(ctx, fn11);
-    gen_fp_exc_clear();
 
     va = gen_ieee_input(ctx, ra, fn11, 0);
     vb = gen_ieee_input(ctx, rb, fn11, 0);
@@ -895,8 +868,6 @@ static void gen_ieee_compare(DisasContext *ctx,
 {
     TCGv va, vb, vc;
 
-    gen_fp_exc_clear();
-
     va = gen_ieee_input(ctx, ra, fn11, 1);
     vb = gen_ieee_input(ctx, rb, fn11, 1);
     vc = dest_fpr(ctx, rc);