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authorWill Newton <will.newton@linaro.org>2013-12-02 13:40:14 +0000
committerPeter Maydell <peter.maydell@linaro.org>2013-12-30 18:13:31 +0000
commit562dbef6c2d1e59d0200e7a69a1db79cc745d673 (patch)
tree295dd9c5c99cb07805cc1710a51391216c775ea3
parentc6e700407031587bd9fd4c366dbd3d71c850a3b2 (diff)
downloadqemu-arm-562dbef6c2d1e59d0200e7a69a1db79cc745d673.tar.gz
softfloat: Add float to 16bit integer conversions.
ARMv8 requires support for converting 32 and 64bit floating point values to signed and unsigned 16bit integers. Signed-off-by: Will Newton <will.newton@linaro.org> [PMM: updated not to incorrectly set Inexact for Invalid inputs] Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
-rw-r--r--fpu/softfloat.c80
-rw-r--r--include/fpu/softfloat.h4
2 files changed, 84 insertions, 0 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 6a6b6567d7..e078539410 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -6491,6 +6491,46 @@ uint32 float32_to_uint32_round_to_zero( float32 a STATUS_PARAM )
return res;
}
+int_fast16_t float32_to_int16(float32 a STATUS_PARAM)
+{
+ int64_t v;
+ int_fast16_t res;
+ int old_exc_flags = get_float_exception_flags(status);
+
+ v = float32_to_int64(a STATUS_VAR);
+ if (v < -0x8000) {
+ res = -0x8000;
+ } else if (v > 0x7fff) {
+ res = 0x7fff;
+ } else {
+ return v;
+ }
+
+ set_float_exception_flags(old_exc_flags, status);
+ float_raise(float_flag_invalid STATUS_VAR);
+ return res;
+}
+
+uint_fast16_t float32_to_uint16(float32 a STATUS_PARAM)
+{
+ int64_t v;
+ uint_fast16_t res;
+ int old_exc_flags = get_float_exception_flags(status);
+
+ v = float32_to_int64(a STATUS_VAR);
+ if (v < 0) {
+ res = 0;
+ } else if (v > 0xffff) {
+ res = 0xffff;
+ } else {
+ return v;
+ }
+
+ set_float_exception_flags(old_exc_flags, status);
+ float_raise(float_flag_invalid STATUS_VAR);
+ return res;
+}
+
uint_fast16_t float32_to_uint16_round_to_zero(float32 a STATUS_PARAM)
{
int64_t v;
@@ -6545,6 +6585,46 @@ uint32 float64_to_uint32_round_to_zero( float64 a STATUS_PARAM )
return res;
}
+int_fast16_t float64_to_int16(float64 a STATUS_PARAM)
+{
+ int64_t v;
+ int_fast16_t res;
+ int old_exc_flags = get_float_exception_flags(status);
+
+ v = float64_to_int64(a STATUS_VAR);
+ if (v < -0x8000) {
+ res = -0x8000;
+ } else if (v > 0x7fff) {
+ res = 0x7fff;
+ } else {
+ return v;
+ }
+
+ set_float_exception_flags(old_exc_flags, status);
+ float_raise(float_flag_invalid STATUS_VAR);
+ return res;
+}
+
+uint_fast16_t float64_to_uint16(float64 a STATUS_PARAM)
+{
+ int64_t v;
+ uint_fast16_t res;
+ int old_exc_flags = get_float_exception_flags(status);
+
+ v = float64_to_int64(a STATUS_VAR);
+ if (v < 0) {
+ res = 0;
+ } else if (v > 0xffff) {
+ res = 0xffff;
+ } else {
+ return v;
+ }
+
+ set_float_exception_flags(old_exc_flags, status);
+ float_raise(float_flag_invalid STATUS_VAR);
+ return res;
+}
+
uint_fast16_t float64_to_uint16_round_to_zero(float64 a STATUS_PARAM)
{
int64_t v;
diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h
index 2365274daa..a9b8cd9950 100644
--- a/include/fpu/softfloat.h
+++ b/include/fpu/softfloat.h
@@ -265,6 +265,8 @@ extern const float16 float16_default_nan;
/*----------------------------------------------------------------------------
| Software IEC/IEEE single-precision conversion routines.
*----------------------------------------------------------------------------*/
+int_fast16_t float32_to_int16(float32 STATUS_PARAM);
+uint_fast16_t float32_to_uint16(float32 STATUS_PARAM);
int_fast16_t float32_to_int16_round_to_zero(float32 STATUS_PARAM);
uint_fast16_t float32_to_uint16_round_to_zero(float32 STATUS_PARAM);
int32 float32_to_int32( float32 STATUS_PARAM );
@@ -371,6 +373,8 @@ extern const float32 float32_default_nan;
/*----------------------------------------------------------------------------
| Software IEC/IEEE double-precision conversion routines.
*----------------------------------------------------------------------------*/
+int_fast16_t float64_to_int16(float64 STATUS_PARAM);
+uint_fast16_t float64_to_uint16(float64 STATUS_PARAM);
int_fast16_t float64_to_int16_round_to_zero(float64 STATUS_PARAM);
uint_fast16_t float64_to_uint16_round_to_zero(float64 STATUS_PARAM);
int32 float64_to_int32( float64 STATUS_PARAM );