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[Qemu-devel] [PATCH 02/19] fpu/softfloat: Split floatXX_silence_nan from
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 02/19] fpu/softfloat: Split floatXX_silence_nan from floatXX_maybe_silence_nan |
Date: |
Thu, 10 May 2018 17:43:28 -0700 |
The new function assumes that the input is an SNaN and
does not double-check.
Signed-off-by: Richard Henderson <address@hidden>
---
fpu/softfloat-specialize.h | 174 +++++++++++++++++++++++++------------
include/fpu/softfloat.h | 5 ++
2 files changed, 123 insertions(+), 56 deletions(-)
diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h
index 8bd553abd2..b59356f6a5 100644
--- a/fpu/softfloat-specialize.h
+++ b/fpu/softfloat-specialize.h
@@ -271,22 +271,35 @@ int float16_is_signaling_nan(float16 a_, float_status
*status)
#endif
}
+/*----------------------------------------------------------------------------
+| Returns a quiet NaN from a signalling NaN for the half-precision
+| floating point value `a'.
+*----------------------------------------------------------------------------*/
+
+float16 float16_silence_nan(float16 a, float_status *status)
+{
+#ifdef NO_SIGNALING_NANS
+ g_assert_not_reached();
+#else
+ if (status->snan_bit_is_one) {
+ return float16_default_nan(status);
+ } else {
+ return a | (1 << 9);
+ }
+#endif
+}
+
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the half-precision floating point value `a' is a
| signaling NaN; otherwise returns `a'.
*----------------------------------------------------------------------------*/
-float16 float16_maybe_silence_nan(float16 a_, float_status *status)
+
+float16 float16_maybe_silence_nan(float16 a, float_status *status)
{
- if (float16_is_signaling_nan(a_, status)) {
- if (status->snan_bit_is_one) {
- return float16_default_nan(status);
- } else {
- uint16_t a = float16_val(a_);
- a |= (1 << 9);
- return make_float16(a);
- }
+ if (float16_is_signaling_nan(a, status)) {
+ float16_silence_nan(a, status);
}
- return a_;
+ return a;
}
/*----------------------------------------------------------------------------
@@ -327,30 +340,40 @@ int float32_is_signaling_nan(float32 a_, float_status
*status)
#endif
}
+/*----------------------------------------------------------------------------
+| Returns a quiet NaN from a signalling NaN for the single-precision
+| floating point value `a'.
+*----------------------------------------------------------------------------*/
+
+float32 float32_silence_nan(float32 a, float_status *status)
+{
+#ifdef NO_SIGNALING_NANS
+ g_assert_not_reached();
+#else
+ if (status->snan_bit_is_one) {
+# ifdef TARGET_HPPA
+ a &= ~0x00400000;
+ a |= 0x00200000;
+ return a;
+# else
+ return float32_default_nan(status);
+# endif
+ } else {
+ return a | (1 << 22);
+ }
+#endif
+}
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the single-precision floating point value `a' is a
| signaling NaN; otherwise returns `a'.
*----------------------------------------------------------------------------*/
-float32 float32_maybe_silence_nan(float32 a_, float_status *status)
+float32 float32_maybe_silence_nan(float32 a, float_status *status)
{
- if (float32_is_signaling_nan(a_, status)) {
- if (status->snan_bit_is_one) {
-#ifdef TARGET_HPPA
- uint32_t a = float32_val(a_);
- a &= ~0x00400000;
- a |= 0x00200000;
- return make_float32(a);
-#else
- return float32_default_nan(status);
-#endif
- } else {
- uint32_t a = float32_val(a_);
- a |= (1 << 22);
- return make_float32(a);
- }
+ if (float32_is_signaling_nan(a, status)) {
+ float32_silence_nan(a, status);
}
- return a_;
+ return a;
}
/*----------------------------------------------------------------------------
@@ -736,30 +759,41 @@ int float64_is_signaling_nan(float64 a_, float_status
*status)
#endif
}
+/*----------------------------------------------------------------------------
+| Returns a quiet NaN from a signalling NaN for the double-precision
+| floating point value `a'.
+*----------------------------------------------------------------------------*/
+
+float64 float64_silence_nan(float64 a, float_status *status)
+{
+#ifdef NO_SIGNALING_NANS
+ g_assert_not_reached();
+#else
+ if (status->snan_bit_is_one) {
+# ifdef TARGET_HPPA
+ a &= ~0x0008000000000000ULL;
+ a |= 0x0004000000000000ULL;
+ return a;
+# else
+ return float64_default_nan(status);
+# endif
+ } else {
+ return a | LIT64(0x0008000000000000);
+ }
+#endif
+}
+
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the double-precision floating point value `a' is a
| signaling NaN; otherwise returns `a'.
*----------------------------------------------------------------------------*/
-float64 float64_maybe_silence_nan(float64 a_, float_status *status)
+float64 float64_maybe_silence_nan(float64 a, float_status *status)
{
- if (float64_is_signaling_nan(a_, status)) {
- if (status->snan_bit_is_one) {
-#ifdef TARGET_HPPA
- uint64_t a = float64_val(a_);
- a &= ~0x0008000000000000ULL;
- a |= 0x0004000000000000ULL;
- return make_float64(a);
-#else
- return float64_default_nan(status);
-#endif
- } else {
- uint64_t a = float64_val(a_);
- a |= LIT64(0x0008000000000000);
- return make_float64(a);
- }
+ if (float64_is_signaling_nan(a, status)) {
+ return float64_silence_nan(a, status);
}
- return a_;
+ return a;
}
/*----------------------------------------------------------------------------
@@ -897,6 +931,25 @@ int floatx80_is_signaling_nan(floatx80 a, float_status
*status)
#endif
}
+/*----------------------------------------------------------------------------
+| Returns a quiet NaN from a signalling NaN for the extended double-precision
+| floating point value `a'.
+*----------------------------------------------------------------------------*/
+
+floatx80 floatx80_silence_nan(floatx80 a, float_status *status)
+{
+#ifdef NO_SIGNALING_NANS
+ g_assert_not_reached();
+#else
+ if (status->snan_bit_is_one) {
+ return floatx80_default_nan(status);
+ } else {
+ a.low |= LIT64(0xC000000000000000);
+ return a;
+ }
+#endif
+}
+
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the extended double-precision floating point value
| `a' is a signaling NaN; otherwise returns `a'.
@@ -905,12 +958,7 @@ int floatx80_is_signaling_nan(floatx80 a, float_status
*status)
floatx80 floatx80_maybe_silence_nan(floatx80 a, float_status *status)
{
if (floatx80_is_signaling_nan(a, status)) {
- if (status->snan_bit_is_one) {
- a = floatx80_default_nan(status);
- } else {
- a.low |= LIT64(0xC000000000000000);
- return a;
- }
+ return floatx80_silence_nan(a, status);
}
return a;
}
@@ -1044,6 +1092,25 @@ int float128_is_signaling_nan(float128 a, float_status
*status)
#endif
}
+/*----------------------------------------------------------------------------
+| Returns a quiet NaN from a signalling NaN for the quadruple-precision
+| floating point value `a'.
+*----------------------------------------------------------------------------*/
+
+float128 float128_silence_nan(float128 a, float_status *status)
+{
+#ifdef NO_SIGNALING_NANS
+ g_assert_not_reached();
+#else
+ if (status->snan_bit_is_one) {
+ return float128_default_nan(status);
+ } else {
+ a.high |= LIT64(0x0000800000000000);
+ return a;
+ }
+#endif
+}
+
/*----------------------------------------------------------------------------
| Returns a quiet NaN if the quadruple-precision floating point value `a' is
| a signaling NaN; otherwise returns `a'.
@@ -1052,12 +1119,7 @@ int float128_is_signaling_nan(float128 a, float_status
*status)
float128 float128_maybe_silence_nan(float128 a, float_status *status)
{
if (float128_is_signaling_nan(a, status)) {
- if (status->snan_bit_is_one) {
- a = float128_default_nan(status);
- } else {
- a.high |= LIT64(0x0000800000000000);
- return a;
- }
+ return float128_silence_nan(a, status);
}
return a;
}
diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h
index 01ef1c6b81..a6860e858d 100644
--- a/include/fpu/softfloat.h
+++ b/include/fpu/softfloat.h
@@ -257,6 +257,7 @@ int float16_compare_quiet(float16, float16, float_status
*status);
int float16_is_quiet_nan(float16, float_status *status);
int float16_is_signaling_nan(float16, float_status *status);
+float16 float16_silence_nan(float16, float_status *status);
float16 float16_maybe_silence_nan(float16, float_status *status);
static inline int float16_is_any_nan(float16 a)
@@ -368,6 +369,7 @@ float32 float32_minnummag(float32, float32, float_status
*status);
float32 float32_maxnummag(float32, float32, float_status *status);
int float32_is_quiet_nan(float32, float_status *status);
int float32_is_signaling_nan(float32, float_status *status);
+float32 float32_silence_nan(float32, float_status *status);
float32 float32_maybe_silence_nan(float32, float_status *status);
float32 float32_scalbn(float32, int, float_status *status);
@@ -497,6 +499,7 @@ float64 float64_minnummag(float64, float64, float_status
*status);
float64 float64_maxnummag(float64, float64, float_status *status);
int float64_is_quiet_nan(float64 a, float_status *status);
int float64_is_signaling_nan(float64, float_status *status);
+float64 float64_silence_nan(float64, float_status *status);
float64 float64_maybe_silence_nan(float64, float_status *status);
float64 float64_scalbn(float64, int, float_status *status);
@@ -600,6 +603,7 @@ int floatx80_compare(floatx80, floatx80, float_status
*status);
int floatx80_compare_quiet(floatx80, floatx80, float_status *status);
int floatx80_is_quiet_nan(floatx80, float_status *status);
int floatx80_is_signaling_nan(floatx80, float_status *status);
+floatx80 floatx80_silence_nan(floatx80, float_status *status);
floatx80 floatx80_maybe_silence_nan(floatx80, float_status *status);
floatx80 floatx80_scalbn(floatx80, int, float_status *status);
@@ -811,6 +815,7 @@ int float128_compare(float128, float128, float_status
*status);
int float128_compare_quiet(float128, float128, float_status *status);
int float128_is_quiet_nan(float128, float_status *status);
int float128_is_signaling_nan(float128, float_status *status);
+float128 float128_silence_nan(float128, float_status *status);
float128 float128_maybe_silence_nan(float128, float_status *status);
float128 float128_scalbn(float128, int, float_status *status);
--
2.17.0
- [Qemu-devel] [PATCH 00/19] softfloat: Clean up NaN handling, Richard Henderson, 2018/05/10
- [Qemu-devel] [PATCH 04/19] fpu/softfloat: Canonicalize NaN fraction, Richard Henderson, 2018/05/10
- [Qemu-devel] [PATCH 03/19] fpu/softfloat: Move softfloat-specialize.h below FloatParts definition, Richard Henderson, 2018/05/10
- [Qemu-devel] [PATCH 05/19] fpu/softfloat: Introduce parts_is_snan_frac, Richard Henderson, 2018/05/10
- [Qemu-devel] [PATCH 06/19] fpu/softfloat: Replace float_class_dnan with parts_default_nan, Richard Henderson, 2018/05/10