For each operand, pass a single enumeration instead of a pair of booleans.
The commit also merges multiple different ifdef-selected implementations
of pickNaN into a single function whose body is ifdef-selected.
Reviewed-by: Peter Maydell <peter.mayd...@linaro.org>
Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
---
fpu/softfloat-specialize.h | 168 ++++++++++++++++++-------------------
fpu/softfloat.c | 3 +-
2 files changed, 82 insertions(+), 89 deletions(-)
diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h
index d1e06da75b..2695183188 100644
--- a/fpu/softfloat-specialize.h
+++ b/fpu/softfloat-specialize.h
@@ -501,10 +501,10 @@ static float32 commonNaNToFloat32(commonNaNT a,
float_status *status)
| tie-break rule.
*----------------------------------------------------------------------------*/
-#if defined(TARGET_ARM)
-static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
+static int pickNaN(FloatClass a_cls, FloatClass b_cls,
flag aIsLargerSignificand)
{
+#if defined(TARGET_ARM) || defined(TARGET_MIPS) || defined(TARGET_HPPA)
/* ARM mandated NaN propagation rules (see FPProcessNaNs()), take
* the first of:
* 1. A if it is signaling
@@ -513,20 +513,6 @@ static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag
bIsQNaN, flag bIsSNaN,
* 4. B (quiet)
* A signaling NaN is always quietened before returning it.
*/
- if (aIsSNaN) {
- return 0;
- } else if (bIsSNaN) {
- return 1;
- } else if (aIsQNaN) {
- return 0;
- } else {
- return 1;
- }
-}
-#elif defined(TARGET_MIPS) || defined(TARGET_HPPA)
-static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
- flag aIsLargerSignificand)
-{
/* According to MIPS specifications, if one of the two operands is
* a sNaN, a new qNaN has to be generated. This is done in
* floatXX_silence_nan(). For qNaN inputs the specifications
@@ -540,35 +526,21 @@ static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag
bIsQNaN, flag bIsSNaN,
* 4. B (quiet)
* A signaling NaN is always silenced before returning it.
*/
- if (aIsSNaN) {
+ if (is_snan(a_cls)) {
return 0;
- } else if (bIsSNaN) {
+ } else if (is_snan(b_cls)) {
return 1;
- } else if (aIsQNaN) {
+ } else if (is_qnan(a_cls)) {
return 0;
} else {
return 1;
}
-}
-#elif defined(TARGET_PPC) || defined(TARGET_XTENSA)
-static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
- flag aIsLargerSignificand)
-{
+#elif defined(TARGET_PPC) || defined(TARGET_XTENSA) || defined(TARGET_M68K)
/* PowerPC propagation rules:
* 1. A if it sNaN or qNaN
* 2. B if it sNaN or qNaN
* A signaling NaN is always silenced before returning it.
*/
- if (aIsSNaN || aIsQNaN) {
- return 0;
- } else {
- return 1;
- }
-}
-#elif defined(TARGET_M68K)
-static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
- flag aIsLargerSignificand)
-{
/* M68000 FAMILY PROGRAMMER'S REFERENCE MANUAL
* 3.4 FLOATING-POINT INSTRUCTION DETAILS
* If either operand, but not both operands, of an operation is a
@@ -583,16 +555,12 @@ static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag
bIsQNaN, flag bIsSNaN,
* a nonsignaling NaN. The operation then continues as described in the
* preceding paragraph for nonsignaling NaNs.
*/
- if (aIsQNaN || aIsSNaN) { /* a is the destination operand */
- return 0; /* return the destination operand */
+ if (is_nan(a_cls)) {
+ return 0;
} else {
- return 1; /* return b */
+ return 1;
}
-}
#else
-static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag bIsQNaN, flag bIsSNaN,
- flag aIsLargerSignificand)
-{
/* This implements x87 NaN propagation rules:
* SNaN + QNaN => return the QNaN
* two SNaNs => return the one with the larger significand, silenced
@@ -603,13 +571,13 @@ static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag
bIsQNaN, flag bIsSNaN,
* If we get down to comparing significands and they are the same,
* return the NaN with the positive sign bit (if any).
*/
- if (aIsSNaN) {
- if (bIsSNaN) {
+ if (is_snan(a_cls)) {
+ if (is_snan(b_cls)) {
return aIsLargerSignificand ? 0 : 1;
}
- return bIsQNaN ? 1 : 0;
- } else if (aIsQNaN) {
- if (bIsSNaN || !bIsQNaN) {
+ return is_qnan(b_cls) ? 1 : 0;
+ } else if (is_qnan(a_cls)) {
+ if (is_snan(b_cls) || !is_qnan(b_cls)) {
return 0;
} else {
return aIsLargerSignificand ? 0 : 1;
@@ -617,8 +585,8 @@ static int pickNaN(flag aIsQNaN, flag aIsSNaN, flag
bIsQNaN, flag bIsSNaN,
} else {
return 1;
}
-}
#endif
+}
/*----------------------------------------------------------------------------
| Select which NaN to propagate for a three-input operation.
@@ -752,18 +720,26 @@ static int pickNaNMulAdd(flag aIsQNaN, flag aIsSNaN, flag
bIsQNaN, flag bIsSNaN,
static float32 propagateFloat32NaN(float32 a, float32 b, float_status *status)
{
- flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN;
flag aIsLargerSignificand;
uint32_t av, bv;
+ FloatClass a_cls, b_cls;
+
+ /* This is not complete, but is good enough for pickNaN. */
+ a_cls = (!float32_is_any_nan(a)
+ ? float_class_normal
+ : float32_is_signaling_nan(a, status)
+ ? float_class_snan
+ : float_class_qnan);
+ b_cls = (!float32_is_any_nan(b)
+ ? float_class_normal
+ : float32_is_signaling_nan(b, status)
+ ? float_class_snan
+ : float_class_qnan);
- aIsQuietNaN = float32_is_quiet_nan(a, status);
- aIsSignalingNaN = float32_is_signaling_nan(a, status);
- bIsQuietNaN = float32_is_quiet_nan(b, status);
- bIsSignalingNaN = float32_is_signaling_nan(b, status);
av = float32_val(a);
bv = float32_val(b);
- if (aIsSignalingNaN | bIsSignalingNaN) {
+ if (is_snan(a_cls) || is_snan(b_cls)) {
float_raise(float_flag_invalid, status);
}
@@ -779,14 +755,13 @@ static float32 propagateFloat32NaN(float32 a, float32 b,
float_status *status)
aIsLargerSignificand = (av < bv) ? 1 : 0;
}
- if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
- aIsLargerSignificand)) {
- if (bIsSignalingNaN) {
+ if (pickNaN(a_cls, b_cls, aIsLargerSignificand)) {
+ if (is_snan(b_cls)) {
return float32_silence_nan(b, status);
}
return b;
} else {
- if (aIsSignalingNaN) {
+ if (is_snan(a_cls)) {
return float32_silence_nan(a, status);
}
return a;
@@ -908,18 +883,26 @@ static float64 commonNaNToFloat64(commonNaNT a,
float_status *status)
static float64 propagateFloat64NaN(float64 a, float64 b, float_status *status)
{
- flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN;
flag aIsLargerSignificand;
uint64_t av, bv;
+ FloatClass a_cls, b_cls;
+
+ /* This is not complete, but is good enough for pickNaN. */
+ a_cls = (!float64_is_any_nan(a)
+ ? float_class_normal
+ : float64_is_signaling_nan(a, status)
+ ? float_class_snan
+ : float_class_qnan);
+ b_cls = (!float64_is_any_nan(b)
+ ? float_class_normal
+ : float64_is_signaling_nan(b, status)
+ ? float_class_snan
+ : float_class_qnan);
- aIsQuietNaN = float64_is_quiet_nan(a, status);
- aIsSignalingNaN = float64_is_signaling_nan(a, status);
- bIsQuietNaN = float64_is_quiet_nan(b, status);
- bIsSignalingNaN = float64_is_signaling_nan(b, status);
av = float64_val(a);
bv = float64_val(b);
- if (aIsSignalingNaN | bIsSignalingNaN) {
+ if (is_snan(a_cls) || is_snan(b_cls)) {
float_raise(float_flag_invalid, status);
}
@@ -935,14 +918,13 @@ static float64 propagateFloat64NaN(float64 a, float64 b,
float_status *status)
aIsLargerSignificand = (av < bv) ? 1 : 0;
}
- if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
- aIsLargerSignificand)) {
- if (bIsSignalingNaN) {
+ if (pickNaN(a_cls, b_cls, aIsLargerSignificand)) {
+ if (is_snan(b_cls)) {
return float64_silence_nan(b, status);
}
return b;
} else {
- if (aIsSignalingNaN) {
+ if (is_snan(a_cls)) {
return float64_silence_nan(a, status);
}
return a;
@@ -1075,15 +1057,22 @@ static floatx80 commonNaNToFloatx80(commonNaNT a,
float_status *status)
floatx80 propagateFloatx80NaN(floatx80 a, floatx80 b, float_status *status)
{
- flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN;
flag aIsLargerSignificand;
+ FloatClass a_cls, b_cls;
- aIsQuietNaN = floatx80_is_quiet_nan(a, status);
- aIsSignalingNaN = floatx80_is_signaling_nan(a, status);
- bIsQuietNaN = floatx80_is_quiet_nan(b, status);
- bIsSignalingNaN = floatx80_is_signaling_nan(b, status);
+ /* This is not complete, but is good enough for pickNaN. */
+ a_cls = (!floatx80_is_any_nan(a)
+ ? float_class_normal
+ : floatx80_is_signaling_nan(a, status)
+ ? float_class_snan
+ : float_class_qnan);
+ b_cls = (!floatx80_is_any_nan(b)
+ ? float_class_normal
+ : floatx80_is_signaling_nan(b, status)
+ ? float_class_snan
+ : float_class_qnan);
- if (aIsSignalingNaN | bIsSignalingNaN) {
+ if (is_snan(a_cls) || is_snan(b_cls)) {
float_raise(float_flag_invalid, status);
}
@@ -1099,14 +1088,13 @@ floatx80 propagateFloatx80NaN(floatx80 a, floatx80 b,
float_status *status)
aIsLargerSignificand = (a.high < b.high) ? 1 : 0;
}
- if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
- aIsLargerSignificand)) {
- if (bIsSignalingNaN) {
+ if (pickNaN(a_cls, b_cls, aIsLargerSignificand)) {
+ if (is_snan(b_cls)) {
return floatx80_silence_nan(b, status);
}
return b;
} else {
- if (aIsSignalingNaN) {
+ if (is_snan(a_cls)) {
return floatx80_silence_nan(a, status);
}
return a;
@@ -1217,15 +1205,22 @@ static float128 commonNaNToFloat128(commonNaNT a,
float_status *status)
static float128 propagateFloat128NaN(float128 a, float128 b,
float_status *status)
{
- flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN;
flag aIsLargerSignificand;
+ FloatClass a_cls, b_cls;
- aIsQuietNaN = float128_is_quiet_nan(a, status);
- aIsSignalingNaN = float128_is_signaling_nan(a, status);
- bIsQuietNaN = float128_is_quiet_nan(b, status);
- bIsSignalingNaN = float128_is_signaling_nan(b, status);
+ /* This is not complete, but is good enough for pickNaN. */
+ a_cls = (!float128_is_any_nan(a)
+ ? float_class_normal
+ : float128_is_signaling_nan(a, status)
+ ? float_class_snan
+ : float_class_qnan);
+ b_cls = (!float128_is_any_nan(b)
+ ? float_class_normal
+ : float128_is_signaling_nan(b, status)
+ ? float_class_snan
+ : float_class_qnan);
- if (aIsSignalingNaN | bIsSignalingNaN) {
+ if (is_snan(a_cls) || is_snan(b_cls)) {
float_raise(float_flag_invalid, status);
}
@@ -1241,14 +1236,13 @@ static float128 propagateFloat128NaN(float128 a,
float128 b,
aIsLargerSignificand = (a.high < b.high) ? 1 : 0;
}
- if (pickNaN(aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN,
- aIsLargerSignificand)) {
- if (bIsSignalingNaN) {
+ if (pickNaN(a_cls, b_cls, aIsLargerSignificand)) {
+ if (is_snan(b_cls)) {
return float128_silence_nan(b, status);
}
return b;
} else {
- if (aIsSignalingNaN) {
+ if (is_snan(a_cls)) {
return float128_silence_nan(a, status);
}
return a;
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index ea252e0c84..55954385ff 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -580,8 +580,7 @@ static FloatParts pick_nan(FloatParts a, FloatParts b,
float_status *s)
if (s->default_nan_mode) {
return parts_default_nan(s);
} else {
- if (pickNaN(is_qnan(a.cls), is_snan(a.cls),
- is_qnan(b.cls), is_snan(b.cls),
+ if (pickNaN(a.cls, b.cls,
a.frac > b.frac ||
(a.frac == b.frac && a.sign < b.sign))) {
a = b;
--
2.17.0
