diff mbox

[v2,06/24] softfloat: Only raise Invalid when conversions to int are out of range

Message ID 1389013881-15726-7-git-send-email-peter.maydell@linaro.org
State New
Headers show

Commit Message

Peter Maydell Jan. 6, 2014, 1:11 p.m. UTC 
We implement a number of float-to-integer conversions using conversion
to an integer type with a wider range and then a check against the
narrower range we are actually converting to. If we find the result to
be out of range we correctly raise the Invalid exception, but we must
also suppress other exceptions which might have been raised by the
conversion function we called.

This won't throw away exceptions we should have preserved, because for
the 'core' exception flags the IEEE spec mandates that the only valid
combinations of exception that can be raised by a single operation are
Inexact + Overflow and Inexact + Underflow. For the non-IEEE softfloat
flag for input denormals, we can guarantee that that flag won't have
been set for out of range float-to-int conversions because a squashed
denormal by definition goes to plus or minus zero, which is always in
range after conversion to integer zero.

This bug has been fixed for some of the float-to-int conversion routines
by previous patches; fix it for the remaining functions as well, so
that they all restore the pre-conversion status flags prior to raising
Invalid.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
---
 fpu/softfloat.c | 28 ++++++++++++++++------------
 1 file changed, 16 insertions(+), 12 deletions(-)

Comments

Richard Henderson Jan. 6, 2014, 6:24 p.m. UTC | #1 
On 01/06/2014 05:11 AM, Peter Maydell wrote:
> We implement a number of float-to-integer conversions using conversion
> to an integer type with a wider range and then a check against the
> narrower range we are actually converting to. If we find the result to
> be out of range we correctly raise the Invalid exception, but we must
> also suppress other exceptions which might have been raised by the
> conversion function we called.
> 
> This won't throw away exceptions we should have preserved, because for
> the 'core' exception flags the IEEE spec mandates that the only valid
> combinations of exception that can be raised by a single operation are
> Inexact + Overflow and Inexact + Underflow. For the non-IEEE softfloat
> flag for input denormals, we can guarantee that that flag won't have
> been set for out of range float-to-int conversions because a squashed
> denormal by definition goes to plus or minus zero, which is always in
> range after conversion to integer zero.
> 
> This bug has been fixed for some of the float-to-int conversion routines
> by previous patches; fix it for the remaining functions as well, so
> that they all restore the pre-conversion status flags prior to raising
> Invalid.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>
> ---
>  fpu/softfloat.c | 28 ++++++++++++++++------------
>  1 file changed, 16 insertions(+), 12 deletions(-)

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


r~
diff mbox

Patch

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 2364513..6312e0c 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -6509,17 +6509,18 @@  uint32 float32_to_uint32( float32 a STATUS_PARAM )
 {
     int64_t v;
     uint32 res;
+    int old_exc_flags = get_float_exception_flags(status);
 
     v = float32_to_int64(a STATUS_VAR);
     if (v < 0) {
         res = 0;
-        float_raise( float_flag_invalid STATUS_VAR);
     } else if (v > 0xffffffff) {
         res = 0xffffffff;
-        float_raise( float_flag_invalid STATUS_VAR);
     } else {
-        res = v;
+        return v;
     }
+    set_float_exception_flags(old_exc_flags, status);
+    float_raise(float_flag_invalid STATUS_VAR);
     return res;
 }
 
@@ -6527,17 +6528,18 @@  uint32 float32_to_uint32_round_to_zero( float32 a STATUS_PARAM )
 {
     int64_t v;
     uint32 res;
+    int old_exc_flags = get_float_exception_flags(status);
 
     v = float32_to_int64_round_to_zero(a STATUS_VAR);
     if (v < 0) {
         res = 0;
-        float_raise( float_flag_invalid STATUS_VAR);
     } else if (v > 0xffffffff) {
         res = 0xffffffff;
-        float_raise( float_flag_invalid STATUS_VAR);
     } else {
-        res = v;
+        return v;
     }
+    set_float_exception_flags(old_exc_flags, status);
+    float_raise(float_flag_invalid STATUS_VAR);
     return res;
 }
 
@@ -6585,17 +6587,18 @@  uint_fast16_t float32_to_uint16_round_to_zero(float32 a STATUS_PARAM)
 {
     int64_t v;
     uint_fast16_t res;
+    int old_exc_flags = get_float_exception_flags(status);
 
     v = float32_to_int64_round_to_zero(a STATUS_VAR);
     if (v < 0) {
         res = 0;
-        float_raise( float_flag_invalid STATUS_VAR);
     } else if (v > 0xffff) {
         res = 0xffff;
-        float_raise( float_flag_invalid STATUS_VAR);
     } else {
-        res = v;
+        return v;
     }
+    set_float_exception_flags(old_exc_flags, status);
+    float_raise(float_flag_invalid STATUS_VAR);
     return res;
 }
 
@@ -6679,17 +6682,18 @@  uint_fast16_t float64_to_uint16_round_to_zero(float64 a STATUS_PARAM)
 {
     int64_t v;
     uint_fast16_t res;
+    int old_exc_flags = get_float_exception_flags(status);
 
     v = float64_to_int64_round_to_zero(a STATUS_VAR);
     if (v < 0) {
         res = 0;
-        float_raise( float_flag_invalid STATUS_VAR);
     } else if (v > 0xffff) {
         res = 0xffff;
-        float_raise( float_flag_invalid STATUS_VAR);
     } else {
-        res = v;
+        return v;
     }
+    set_float_exception_flags(old_exc_flags, status);
+    float_raise(float_flag_invalid STATUS_VAR);
     return res;
 }