Patchwork [10/10] target-arm/helper.c: For float-int conversion helpers pass ints as ints

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Submitter Peter Maydell
Date April 1, 2011, 2:30 p.m.
Message ID <1301668243-29886-11-git-send-email-peter.maydell@linaro.org>
Download mbox | patch
Permalink /patch/89280/
State New
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Comments

Peter Maydell - April 1, 2011, 2:30 p.m.
Correct the argument and return types for the float<->int conversion helper
functions so that integer arguments and return values are declared as
uint32_t/uint64_t, not float32/float64. This allows us to remove the
hand-rolled functions which were doing bitwise copies between the types
via unions.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
---
 target-arm/helper.c  |  155 ++++++++++++++++++--------------------------------
 target-arm/helpers.h |   60 ++++++++++----------
 2 files changed, 85 insertions(+), 130 deletions(-)
Blue Swirl - April 1, 2011, 6:25 p.m.
On Fri, Apr 1, 2011 at 5:30 PM, Peter Maydell <peter.maydell@linaro.org> wrote:
> Correct the argument and return types for the float<->int conversion helper
> functions so that integer arguments and return values are declared as
> uint32_t/uint64_t, not float32/float64. This allows us to remove the
> hand-rolled functions which were doing bitwise copies between the types
> via unions.
>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
> ---
>  target-arm/helper.c  |  155 ++++++++++++++++++--------------------------------
>  target-arm/helpers.h |   60 ++++++++++----------
>  2 files changed, 85 insertions(+), 130 deletions(-)
>
> diff --git a/target-arm/helper.c b/target-arm/helper.c
> index 78f3d39..6788a4c 100644
> --- a/target-arm/helper.c
> +++ b/target-arm/helper.c
> @@ -2486,135 +2486,90 @@ DO_VFP_cmp(s, float32)
>  DO_VFP_cmp(d, float64)
>  #undef DO_VFP_cmp
>
> -/* Helper routines to perform bitwise copies between float and int.  */
> -static inline float32 vfp_itos(uint32_t i)
> -{
> -    union {
> -        uint32_t i;
> -        float32 s;
> -    } v;
> -
> -    v.i = i;
> -    return v.s;
> -}
> -
> -static inline uint32_t vfp_stoi(float32 s)
> -{
> -    union {
> -        uint32_t i;
> -        float32 s;
> -    } v;
> -
> -    v.s = s;
> -    return v.i;
> -}
> -
> -static inline float64 vfp_itod(uint64_t i)
> -{
> -    union {
> -        uint64_t i;
> -        float64 d;
> -    } v;
> -
> -    v.i = i;
> -    return v.d;
> -}
> -
> -static inline uint64_t vfp_dtoi(float64 d)
> -{
> -    union {
> -        uint64_t i;
> -        float64 d;
> -    } v;
> -
> -    v.d = d;
> -    return v.i;
> -}
> -
>  /* Integer to float conversion.  */
> -float32 VFP_HELPER(uito, s)(float32 x, CPUState *env)
> +float32 VFP_HELPER(uito, s)(uint32_t x, CPUState *env)

If you moved these functions to op_helper.c, passing env would not be
needed anymore.

Another possible optimization is that maybe the softfloat functions
could be used directly as helpers if type of fp_status could be
changed to something that can be passed in a register, like uint32_t.
This would be useful for most targets.

Patch

diff --git a/target-arm/helper.c b/target-arm/helper.c
index 78f3d39..6788a4c 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -2486,135 +2486,90 @@  DO_VFP_cmp(s, float32)
 DO_VFP_cmp(d, float64)
 #undef DO_VFP_cmp
 
-/* Helper routines to perform bitwise copies between float and int.  */
-static inline float32 vfp_itos(uint32_t i)
-{
-    union {
-        uint32_t i;
-        float32 s;
-    } v;
-
-    v.i = i;
-    return v.s;
-}
-
-static inline uint32_t vfp_stoi(float32 s)
-{
-    union {
-        uint32_t i;
-        float32 s;
-    } v;
-
-    v.s = s;
-    return v.i;
-}
-
-static inline float64 vfp_itod(uint64_t i)
-{
-    union {
-        uint64_t i;
-        float64 d;
-    } v;
-
-    v.i = i;
-    return v.d;
-}
-
-static inline uint64_t vfp_dtoi(float64 d)
-{
-    union {
-        uint64_t i;
-        float64 d;
-    } v;
-
-    v.d = d;
-    return v.i;
-}
-
 /* Integer to float conversion.  */
-float32 VFP_HELPER(uito, s)(float32 x, CPUState *env)
+float32 VFP_HELPER(uito, s)(uint32_t x, CPUState *env)
 {
-    return uint32_to_float32(vfp_stoi(x), &env->vfp.fp_status);
+    return uint32_to_float32(x, &env->vfp.fp_status);
 }
 
-float64 VFP_HELPER(uito, d)(float32 x, CPUState *env)
+float64 VFP_HELPER(uito, d)(uint32_t x, CPUState *env)
 {
-    return uint32_to_float64(vfp_stoi(x), &env->vfp.fp_status);
+    return uint32_to_float64(x, &env->vfp.fp_status);
 }
 
-float32 VFP_HELPER(sito, s)(float32 x, CPUState *env)
+float32 VFP_HELPER(sito, s)(uint32_t x, CPUState *env)
 {
-    return int32_to_float32(vfp_stoi(x), &env->vfp.fp_status);
+    return int32_to_float32(x, &env->vfp.fp_status);
 }
 
-float64 VFP_HELPER(sito, d)(float32 x, CPUState *env)
+float64 VFP_HELPER(sito, d)(uint32_t x, CPUState *env)
 {
-    return int32_to_float64(vfp_stoi(x), &env->vfp.fp_status);
+    return int32_to_float64(x, &env->vfp.fp_status);
 }
 
 /* Float to integer conversion.  */
-float32 VFP_HELPER(toui, s)(float32 x, CPUState *env)
+uint32_t VFP_HELPER(toui, s)(float32 x, CPUState *env)
 {
     if (float32_is_any_nan(x)) {
-        return float32_zero;
+        return 0;
     }
-    return vfp_itos(float32_to_uint32(x, &env->vfp.fp_status));
+    return float32_to_uint32(x, &env->vfp.fp_status);
 }
 
-float32 VFP_HELPER(toui, d)(float64 x, CPUState *env)
+uint32_t VFP_HELPER(toui, d)(float64 x, CPUState *env)
 {
     if (float64_is_any_nan(x)) {
-        return float32_zero;
+        return 0;
     }
-    return vfp_itos(float64_to_uint32(x, &env->vfp.fp_status));
+    return float64_to_uint32(x, &env->vfp.fp_status);
 }
 
-float32 VFP_HELPER(tosi, s)(float32 x, CPUState *env)
+uint32_t VFP_HELPER(tosi, s)(float32 x, CPUState *env)
 {
     if (float32_is_any_nan(x)) {
-        return float32_zero;
+        return 0;
     }
-    return vfp_itos(float32_to_int32(x, &env->vfp.fp_status));
+    return float32_to_int32(x, &env->vfp.fp_status);
 }
 
-float32 VFP_HELPER(tosi, d)(float64 x, CPUState *env)
+uint32_t VFP_HELPER(tosi, d)(float64 x, CPUState *env)
 {
     if (float64_is_any_nan(x)) {
-        return float32_zero;
+        return 0;
     }
-    return vfp_itos(float64_to_int32(x, &env->vfp.fp_status));
+    return float64_to_int32(x, &env->vfp.fp_status);
 }
 
-float32 VFP_HELPER(touiz, s)(float32 x, CPUState *env)
+uint32_t VFP_HELPER(touiz, s)(float32 x, CPUState *env)
 {
     if (float32_is_any_nan(x)) {
-        return float32_zero;
+        return 0;
     }
-    return vfp_itos(float32_to_uint32_round_to_zero(x, &env->vfp.fp_status));
+    return float32_to_uint32_round_to_zero(x, &env->vfp.fp_status);
 }
 
-float32 VFP_HELPER(touiz, d)(float64 x, CPUState *env)
+uint32_t VFP_HELPER(touiz, d)(float64 x, CPUState *env)
 {
     if (float64_is_any_nan(x)) {
-        return float32_zero;
+        return 0;
     }
-    return vfp_itos(float64_to_uint32_round_to_zero(x, &env->vfp.fp_status));
+    return float64_to_uint32_round_to_zero(x, &env->vfp.fp_status);
 }
 
-float32 VFP_HELPER(tosiz, s)(float32 x, CPUState *env)
+uint32_t VFP_HELPER(tosiz, s)(float32 x, CPUState *env)
 {
     if (float32_is_any_nan(x)) {
-        return float32_zero;
+        return 0;
     }
-    return vfp_itos(float32_to_int32_round_to_zero(x, &env->vfp.fp_status));
+    return float32_to_int32_round_to_zero(x, &env->vfp.fp_status);
 }
 
-float32 VFP_HELPER(tosiz, d)(float64 x, CPUState *env)
+uint32_t VFP_HELPER(tosiz, d)(float64 x, CPUState *env)
 {
     if (float64_is_any_nan(x)) {
-        return float32_zero;
+        return 0;
     }
-    return vfp_itos(float64_to_int32_round_to_zero(x, &env->vfp.fp_status));
+    return float64_to_int32_round_to_zero(x, &env->vfp.fp_status);
 }
 
 /* floating point conversion */
@@ -2637,33 +2592,33 @@  float32 VFP_HELPER(fcvts, d)(float64 x, CPUState *env)
 }
 
 /* VFP3 fixed point conversion.  */
-#define VFP_CONV_FIX(name, p, ftype, itype, sign) \
-ftype VFP_HELPER(name##to, p)(ftype x, uint32_t shift, CPUState *env) \
+#define VFP_CONV_FIX(name, p, fsz, itype, sign) \
+float##fsz VFP_HELPER(name##to, p)(uint##fsz##_t  x, uint32_t shift, \
+                                   CPUState *env) \
 { \
-    ftype tmp; \
-    tmp = sign##int32_to_##ftype ((itype##_t)vfp_##p##toi(x), \
-                                  &env->vfp.fp_status); \
-    return ftype##_scalbn(tmp, -(int)shift, &env->vfp.fp_status); \
+    float##fsz tmp; \
+    tmp = sign##int32_to_##float##fsz ((itype##_t)x, &env->vfp.fp_status); \
+    return float##fsz##_scalbn(tmp, -(int)shift, &env->vfp.fp_status); \
 } \
-ftype VFP_HELPER(to##name, p)(ftype x, uint32_t shift, CPUState *env) \
+uint##fsz##_t VFP_HELPER(to##name, p)(float##fsz x, uint32_t shift, \
+                                      CPUState *env) \
 { \
-    ftype tmp; \
-    if (ftype##_is_any_nan(x)) { \
-        return ftype##_zero; \
+    float##fsz tmp; \
+    if (float##fsz##_is_any_nan(x)) { \
+        return 0; \
     } \
-    tmp = ftype##_scalbn(x, shift, &env->vfp.fp_status); \
-    return vfp_ito##p(ftype##_to_##itype##_round_to_zero(tmp, \
-        &env->vfp.fp_status)); \
-}
-
-VFP_CONV_FIX(sh, d, float64, int16, )
-VFP_CONV_FIX(sl, d, float64, int32, )
-VFP_CONV_FIX(uh, d, float64, uint16, u)
-VFP_CONV_FIX(ul, d, float64, uint32, u)
-VFP_CONV_FIX(sh, s, float32, int16, )
-VFP_CONV_FIX(sl, s, float32, int32, )
-VFP_CONV_FIX(uh, s, float32, uint16, u)
-VFP_CONV_FIX(ul, s, float32, uint32, u)
+    tmp = float##fsz##_scalbn(x, shift, &env->vfp.fp_status); \
+    return float##fsz##_to_##itype##_round_to_zero(tmp, &env->vfp.fp_status); \
+}
+
+VFP_CONV_FIX(sh, d, 64, int16, )
+VFP_CONV_FIX(sl, d, 64, int32, )
+VFP_CONV_FIX(uh, d, 64, uint16, u)
+VFP_CONV_FIX(ul, d, 64, uint32, u)
+VFP_CONV_FIX(sh, s, 32, int16, )
+VFP_CONV_FIX(sl, s, 32, int32, )
+VFP_CONV_FIX(uh, s, 32, uint16, u)
+VFP_CONV_FIX(ul, s, 32, uint32, u)
 #undef VFP_CONV_FIX
 
 /* Half precision conversions.  */
diff --git a/target-arm/helpers.h b/target-arm/helpers.h
index e2260b6..35ca388 100644
--- a/target-arm/helpers.h
+++ b/target-arm/helpers.h
@@ -96,36 +96,36 @@  DEF_HELPER_3(vfp_cmped, void, f64, f64, env)
 DEF_HELPER_2(vfp_fcvtds, f64, f32, env)
 DEF_HELPER_2(vfp_fcvtsd, f32, f64, env)
 
-DEF_HELPER_2(vfp_uitos, f32, f32, env)
-DEF_HELPER_2(vfp_uitod, f64, f32, env)
-DEF_HELPER_2(vfp_sitos, f32, f32, env)
-DEF_HELPER_2(vfp_sitod, f64, f32, env)
-
-DEF_HELPER_2(vfp_touis, f32, f32, env)
-DEF_HELPER_2(vfp_touid, f32, f64, env)
-DEF_HELPER_2(vfp_touizs, f32, f32, env)
-DEF_HELPER_2(vfp_touizd, f32, f64, env)
-DEF_HELPER_2(vfp_tosis, f32, f32, env)
-DEF_HELPER_2(vfp_tosid, f32, f64, env)
-DEF_HELPER_2(vfp_tosizs, f32, f32, env)
-DEF_HELPER_2(vfp_tosizd, f32, f64, env)
-
-DEF_HELPER_3(vfp_toshs, f32, f32, i32, env)
-DEF_HELPER_3(vfp_tosls, f32, f32, i32, env)
-DEF_HELPER_3(vfp_touhs, f32, f32, i32, env)
-DEF_HELPER_3(vfp_touls, f32, f32, i32, env)
-DEF_HELPER_3(vfp_toshd, f64, f64, i32, env)
-DEF_HELPER_3(vfp_tosld, f64, f64, i32, env)
-DEF_HELPER_3(vfp_touhd, f64, f64, i32, env)
-DEF_HELPER_3(vfp_tould, f64, f64, i32, env)
-DEF_HELPER_3(vfp_shtos, f32, f32, i32, env)
-DEF_HELPER_3(vfp_sltos, f32, f32, i32, env)
-DEF_HELPER_3(vfp_uhtos, f32, f32, i32, env)
-DEF_HELPER_3(vfp_ultos, f32, f32, i32, env)
-DEF_HELPER_3(vfp_shtod, f64, f64, i32, env)
-DEF_HELPER_3(vfp_sltod, f64, f64, i32, env)
-DEF_HELPER_3(vfp_uhtod, f64, f64, i32, env)
-DEF_HELPER_3(vfp_ultod, f64, f64, i32, env)
+DEF_HELPER_2(vfp_uitos, f32, i32, env)
+DEF_HELPER_2(vfp_uitod, f64, i32, env)
+DEF_HELPER_2(vfp_sitos, f32, i32, env)
+DEF_HELPER_2(vfp_sitod, f64, i32, env)
+
+DEF_HELPER_2(vfp_touis, i32, f32, env)
+DEF_HELPER_2(vfp_touid, i32, f64, env)
+DEF_HELPER_2(vfp_touizs, i32, f32, env)
+DEF_HELPER_2(vfp_touizd, i32, f64, env)
+DEF_HELPER_2(vfp_tosis, i32, f32, env)
+DEF_HELPER_2(vfp_tosid, i32, f64, env)
+DEF_HELPER_2(vfp_tosizs, i32, f32, env)
+DEF_HELPER_2(vfp_tosizd, i32, f64, env)
+
+DEF_HELPER_3(vfp_toshs, i32, f32, i32, env)
+DEF_HELPER_3(vfp_tosls, i32, f32, i32, env)
+DEF_HELPER_3(vfp_touhs, i32, f32, i32, env)
+DEF_HELPER_3(vfp_touls, i32, f32, i32, env)
+DEF_HELPER_3(vfp_toshd, i64, f64, i32, env)
+DEF_HELPER_3(vfp_tosld, i64, f64, i32, env)
+DEF_HELPER_3(vfp_touhd, i64, f64, i32, env)
+DEF_HELPER_3(vfp_tould, i64, f64, i32, env)
+DEF_HELPER_3(vfp_shtos, f32, i32, i32, env)
+DEF_HELPER_3(vfp_sltos, f32, i32, i32, env)
+DEF_HELPER_3(vfp_uhtos, f32, i32, i32, env)
+DEF_HELPER_3(vfp_ultos, f32, i32, i32, env)
+DEF_HELPER_3(vfp_shtod, f64, i64, i32, env)
+DEF_HELPER_3(vfp_sltod, f64, i64, i32, env)
+DEF_HELPER_3(vfp_uhtod, f64, i64, i32, env)
+DEF_HELPER_3(vfp_ultod, f64, i64, i32, env)
 
 DEF_HELPER_2(vfp_fcvt_f16_to_f32, f32, i32, env)
 DEF_HELPER_2(vfp_fcvt_f32_to_f16, i32, f32, env)