* [Qemu-devel] [PATCH v2 1/2] target-ppc: fix sNaN propagation
@ 2011-01-12 18:42 Aurelien Jarno
2011-01-12 18:42 ` [Qemu-devel] [PATCH 2/2] target-ppc: fix wrong NaN tests Aurelien Jarno
2011-01-13 17:27 ` [Qemu-devel] Re: [PATCH v2 1/2] target-ppc: fix sNaN propagation Nathan Froyd
0 siblings, 2 replies; 4+ messages in thread
From: Aurelien Jarno @ 2011-01-12 18:42 UTC (permalink / raw)
To: qemu-devel; +Cc: Peter Maydell, Nathan Froyd, Alexander Graf, Aurelien Jarno
The current FPU code returns 0.0 if one of the operand is a
signaling NaN and the VXSNAN exception is disabled.
fload_invalid_op_excp() doesn't return a qNaN in case of a VXSNAN
exception as the operand should be propagated instead of a new
qNaN to be generated. Fix that by calling fload_invalid_op_excp()
only for the exception generation (if enabled), and use the softfloat
code to correctly compute the result.
* v1 -> v2:
- fixed a few case were farg.ll was still assigned with the result
of fload_invalid_op_excp, spotted by Peter Maydell. Thanks.
Cc: Alexander Graf <agraf@suse.de>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Nathan Froyd <froydnj@codesourcery.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
target-ppc/op_helper.c | 149 +++++++++++++++++++++++++----------------------
1 files changed, 79 insertions(+), 70 deletions(-)
diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index 9787be7..7ae5052 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -975,15 +975,16 @@ uint64_t helper_fadd (uint64_t arg1, uint64_t arg2)
farg1.ll = arg1;
farg2.ll = arg2;
- if (unlikely(float64_is_signaling_nan(farg1.d) ||
- float64_is_signaling_nan(farg2.d))) {
- /* sNaN addition */
- farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
- } else if (unlikely(float64_is_infinity(farg1.d) && float64_is_infinity(farg2.d) &&
- float64_is_neg(farg1.d) != float64_is_neg(farg2.d))) {
+ if (unlikely(float64_is_infinity(farg1.d) && float64_is_infinity(farg2.d) &&
+ float64_is_neg(farg1.d) != float64_is_neg(farg2.d))) {
/* Magnitude subtraction of infinities */
farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXISI);
} else {
+ if (unlikely(float64_is_signaling_nan(farg1.d) ||
+ float64_is_signaling_nan(farg2.d))) {
+ /* sNaN addition */
+ fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
+ }
farg1.d = float64_add(farg1.d, farg2.d, &env->fp_status);
}
@@ -998,15 +999,16 @@ uint64_t helper_fsub (uint64_t arg1, uint64_t arg2)
farg1.ll = arg1;
farg2.ll = arg2;
- if (unlikely(float64_is_signaling_nan(farg1.d) ||
- float64_is_signaling_nan(farg2.d))) {
- /* sNaN subtraction */
- farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
- } else if (unlikely(float64_is_infinity(farg1.d) && float64_is_infinity(farg2.d) &&
- float64_is_neg(farg1.d) == float64_is_neg(farg2.d))) {
+ if (unlikely(float64_is_infinity(farg1.d) && float64_is_infinity(farg2.d) &&
+ float64_is_neg(farg1.d) == float64_is_neg(farg2.d))) {
/* Magnitude subtraction of infinities */
farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXISI);
} else {
+ if (unlikely(float64_is_signaling_nan(farg1.d) ||
+ float64_is_signaling_nan(farg2.d))) {
+ /* sNaN subtraction */
+ fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
+ }
farg1.d = float64_sub(farg1.d, farg2.d, &env->fp_status);
}
@@ -1021,16 +1023,17 @@ uint64_t helper_fmul (uint64_t arg1, uint64_t arg2)
farg1.ll = arg1;
farg2.ll = arg2;
- if (unlikely(float64_is_signaling_nan(farg1.d) ||
- float64_is_signaling_nan(farg2.d))) {
- /* sNaN multiplication */
- farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
- } else if (unlikely((float64_is_infinity(farg1.d) && float64_is_zero(farg2.d)) ||
- (float64_is_zero(farg1.d) && float64_is_infinity(farg2.d)))) {
+ if (unlikely((float64_is_infinity(farg1.d) && float64_is_zero(farg2.d)) ||
+ (float64_is_zero(farg1.d) && float64_is_infinity(farg2.d)))) {
/* Multiplication of zero by infinity */
farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXIMZ);
} else {
- farg1.d = float64_mul(farg1.d, farg2.d, &env->fp_status);
+ if (unlikely(float64_is_signaling_nan(farg1.d) ||
+ float64_is_signaling_nan(farg2.d))) {
+ /* sNaN multiplication */
+ fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
+ }
+ float64_mul(farg1.d, farg2.d, &env->fp_status);
}
return farg1.ll;
@@ -1044,17 +1047,18 @@ uint64_t helper_fdiv (uint64_t arg1, uint64_t arg2)
farg1.ll = arg1;
farg2.ll = arg2;
- if (unlikely(float64_is_signaling_nan(farg1.d) ||
- float64_is_signaling_nan(farg2.d))) {
- /* sNaN division */
- farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
- } else if (unlikely(float64_is_infinity(farg1.d) && float64_is_infinity(farg2.d))) {
+ if (unlikely(float64_is_infinity(farg1.d) && float64_is_infinity(farg2.d))) {
/* Division of infinity by infinity */
farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXIDI);
} else if (unlikely(float64_is_zero(farg1.d) && float64_is_zero(farg2.d))) {
/* Division of zero by zero */
farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXZDZ);
} else {
+ if (unlikely(float64_is_signaling_nan(farg1.d) ||
+ float64_is_signaling_nan(farg2.d))) {
+ /* sNaN division */
+ fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
+ }
farg1.d = float64_div(farg1.d, farg2.d, &env->fp_status);
}
@@ -1232,16 +1236,17 @@ uint64_t helper_fmadd (uint64_t arg1, uint64_t arg2, uint64_t arg3)
farg2.ll = arg2;
farg3.ll = arg3;
- if (unlikely(float64_is_signaling_nan(farg1.d) ||
- float64_is_signaling_nan(farg2.d) ||
- float64_is_signaling_nan(farg3.d))) {
- /* sNaN operation */
- farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
- } else if (unlikely((float64_is_infinity(farg1.d) && float64_is_zero(farg2.d)) ||
- (float64_is_zero(farg1.d) && float64_is_infinity(farg2.d)))) {
+ if (unlikely((float64_is_infinity(farg1.d) && float64_is_zero(farg2.d)) ||
+ (float64_is_zero(farg1.d) && float64_is_infinity(farg2.d)))) {
/* Multiplication of zero by infinity */
farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXIMZ);
} else {
+ if (unlikely(float64_is_signaling_nan(farg1.d) ||
+ float64_is_signaling_nan(farg2.d) ||
+ float64_is_signaling_nan(farg3.d))) {
+ /* sNaN operation */
+ fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
+ }
#ifdef FLOAT128
/* This is the way the PowerPC specification defines it */
float128 ft0_128, ft1_128;
@@ -1276,16 +1281,17 @@ uint64_t helper_fmsub (uint64_t arg1, uint64_t arg2, uint64_t arg3)
farg2.ll = arg2;
farg3.ll = arg3;
- if (unlikely(float64_is_signaling_nan(farg1.d) ||
- float64_is_signaling_nan(farg2.d) ||
- float64_is_signaling_nan(farg3.d))) {
- /* sNaN operation */
- farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
- } else if (unlikely((float64_is_infinity(farg1.d) && float64_is_zero(farg2.d)) ||
+ if (unlikely((float64_is_infinity(farg1.d) && float64_is_zero(farg2.d)) ||
(float64_is_zero(farg1.d) && float64_is_infinity(farg2.d)))) {
/* Multiplication of zero by infinity */
farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXIMZ);
} else {
+ if (unlikely(float64_is_signaling_nan(farg1.d) ||
+ float64_is_signaling_nan(farg2.d) ||
+ float64_is_signaling_nan(farg3.d))) {
+ /* sNaN operation */
+ fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
+ }
#ifdef FLOAT128
/* This is the way the PowerPC specification defines it */
float128 ft0_128, ft1_128;
@@ -1319,16 +1325,17 @@ uint64_t helper_fnmadd (uint64_t arg1, uint64_t arg2, uint64_t arg3)
farg2.ll = arg2;
farg3.ll = arg3;
- if (unlikely(float64_is_signaling_nan(farg1.d) ||
- float64_is_signaling_nan(farg2.d) ||
- float64_is_signaling_nan(farg3.d))) {
- /* sNaN operation */
- farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
- } else if (unlikely((float64_is_infinity(farg1.d) && float64_is_zero(farg2.d)) ||
- (float64_is_zero(farg1.d) && float64_is_infinity(farg2.d)))) {
+ if (unlikely((float64_is_infinity(farg1.d) && float64_is_zero(farg2.d)) ||
+ (float64_is_zero(farg1.d) && float64_is_infinity(farg2.d)))) {
/* Multiplication of zero by infinity */
farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXIMZ);
} else {
+ if (unlikely(float64_is_signaling_nan(farg1.d) ||
+ float64_is_signaling_nan(farg2.d) ||
+ float64_is_signaling_nan(farg3.d))) {
+ /* sNaN operation */
+ fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
+ }
#ifdef FLOAT128
/* This is the way the PowerPC specification defines it */
float128 ft0_128, ft1_128;
@@ -1364,16 +1371,17 @@ uint64_t helper_fnmsub (uint64_t arg1, uint64_t arg2, uint64_t arg3)
farg2.ll = arg2;
farg3.ll = arg3;
- if (unlikely(float64_is_signaling_nan(farg1.d) ||
- float64_is_signaling_nan(farg2.d) ||
- float64_is_signaling_nan(farg3.d))) {
- /* sNaN operation */
- farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
- } else if (unlikely((float64_is_infinity(farg1.d) && float64_is_zero(farg2.d)) ||
+ if (unlikely((float64_is_infinity(farg1.d) && float64_is_zero(farg2.d)) ||
(float64_is_zero(farg1.d) && float64_is_infinity(farg2.d)))) {
/* Multiplication of zero by infinity */
farg1.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXIMZ);
} else {
+ if (unlikely(float64_is_signaling_nan(farg1.d) ||
+ float64_is_signaling_nan(farg2.d) ||
+ float64_is_signaling_nan(farg3.d))) {
+ /* sNaN operation */
+ fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
+ }
#ifdef FLOAT128
/* This is the way the PowerPC specification defines it */
float128 ft0_128, ft1_128;
@@ -1409,11 +1417,11 @@ uint64_t helper_frsp (uint64_t arg)
if (unlikely(float64_is_signaling_nan(farg.d))) {
/* sNaN square root */
- farg.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
- } else {
- f32 = float64_to_float32(farg.d, &env->fp_status);
- farg.d = float32_to_float64(f32, &env->fp_status);
+ fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
}
+ f32 = float64_to_float32(farg.d, &env->fp_status);
+ farg.d = float32_to_float64(f32, &env->fp_status);
+
return farg.ll;
}
@@ -1423,13 +1431,14 @@ uint64_t helper_fsqrt (uint64_t arg)
CPU_DoubleU farg;
farg.ll = arg;
- if (unlikely(float64_is_signaling_nan(farg.d))) {
- /* sNaN square root */
- farg.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
- } else if (unlikely(float64_is_neg(farg.d) && !float64_is_zero(farg.d))) {
+ if (unlikely(float64_is_neg(farg.d) && !float64_is_zero(farg.d))) {
/* Square root of a negative nonzero number */
farg.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSQRT);
} else {
+ if (unlikely(float64_is_signaling_nan(farg.d))) {
+ /* sNaN square root */
+ fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
+ }
farg.d = float64_sqrt(farg.d, &env->fp_status);
}
return farg.ll;
@@ -1443,10 +1452,9 @@ uint64_t helper_fre (uint64_t arg)
if (unlikely(float64_is_signaling_nan(farg.d))) {
/* sNaN reciprocal */
- farg.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
- } else {
- farg.d = float64_div(float64_one, farg.d, &env->fp_status);
+ fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
}
+ farg.d = float64_div(float64_one, farg.d, &env->fp_status);
return farg.d;
}
@@ -1459,12 +1467,12 @@ uint64_t helper_fres (uint64_t arg)
if (unlikely(float64_is_signaling_nan(farg.d))) {
/* sNaN reciprocal */
- farg.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
- } else {
- farg.d = float64_div(float64_one, farg.d, &env->fp_status);
- f32 = float64_to_float32(farg.d, &env->fp_status);
- farg.d = float32_to_float64(f32, &env->fp_status);
+ fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
}
+ farg.d = float64_div(float64_one, farg.d, &env->fp_status);
+ f32 = float64_to_float32(farg.d, &env->fp_status);
+ farg.d = float32_to_float64(f32, &env->fp_status);
+
return farg.ll;
}
@@ -1475,13 +1483,14 @@ uint64_t helper_frsqrte (uint64_t arg)
float32 f32;
farg.ll = arg;
- if (unlikely(float64_is_signaling_nan(farg.d))) {
- /* sNaN reciprocal square root */
- farg.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
- } else if (unlikely(float64_is_neg(farg.d) && !float64_is_zero(farg.d))) {
+ if (unlikely(float64_is_neg(farg.d) && !float64_is_zero(farg.d))) {
/* Reciprocal square root of a negative nonzero number */
farg.ll = fload_invalid_op_excp(POWERPC_EXCP_FP_VXSQRT);
} else {
+ if (unlikely(float64_is_signaling_nan(farg.d))) {
+ /* sNaN reciprocal square root */
+ fload_invalid_op_excp(POWERPC_EXCP_FP_VXSNAN);
+ }
farg.d = float64_sqrt(farg.d, &env->fp_status);
farg.d = float64_div(float64_one, farg.d, &env->fp_status);
f32 = float64_to_float32(farg.d, &env->fp_status);
--
1.7.2.3
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [Qemu-devel] [PATCH 2/2] target-ppc: fix wrong NaN tests
2011-01-12 18:42 [Qemu-devel] [PATCH v2 1/2] target-ppc: fix sNaN propagation Aurelien Jarno
@ 2011-01-12 18:42 ` Aurelien Jarno
2011-01-13 17:27 ` [Qemu-devel] " Nathan Froyd
2011-01-13 17:27 ` [Qemu-devel] Re: [PATCH v2 1/2] target-ppc: fix sNaN propagation Nathan Froyd
1 sibling, 1 reply; 4+ messages in thread
From: Aurelien Jarno @ 2011-01-12 18:42 UTC (permalink / raw)
To: qemu-devel; +Cc: Peter Maydell, Nathan Froyd, Alexander Graf, Aurelien Jarno
Some tests in FPU emulation code were wrongly using float64_is_nan()
before commit 185698715dfb18c82ad2a5dbc169908602d43e81, and wrongly
using float64_is_quiet_nan() after. Fix them by using float64_is_any_nan()
instead.
Cc: Alexander Graf <agraf@suse.de>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Nathan Froyd <froydnj@codesourcery.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
---
target-ppc/op_helper.c | 45 ++++++++++++++++++++++++++++-----------------
1 files changed, 28 insertions(+), 17 deletions(-)
diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index 7ae5052..9e4cf36 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -546,7 +546,7 @@ uint32_t helper_compute_fprf (uint64_t arg, uint32_t set_fprf)
int ret;
farg.ll = arg;
isneg = float64_is_neg(farg.d);
- if (unlikely(float64_is_quiet_nan(farg.d))) {
+ if (unlikely(float64_is_any_nan(farg.d))) {
if (float64_is_signaling_nan(farg.d)) {
/* Signaling NaN: flags are undefined */
ret = 0x00;
@@ -1356,8 +1356,9 @@ uint64_t helper_fnmadd (uint64_t arg1, uint64_t arg2, uint64_t arg3)
/* This is OK on x86 hosts */
farg1.d = (farg1.d * farg2.d) + farg3.d;
#endif
- if (likely(!float64_is_quiet_nan(farg1.d)))
+ if (likely(!float64_is_any_nan(farg1.d))) {
farg1.d = float64_chs(farg1.d);
+ }
}
return farg1.ll;
}
@@ -1402,8 +1403,9 @@ uint64_t helper_fnmsub (uint64_t arg1, uint64_t arg2, uint64_t arg3)
/* This is OK on x86 hosts */
farg1.d = (farg1.d * farg2.d) - farg3.d;
#endif
- if (likely(!float64_is_quiet_nan(farg1.d)))
+ if (likely(!float64_is_any_nan(farg1.d))) {
farg1.d = float64_chs(farg1.d);
+ }
}
return farg1.ll;
}
@@ -1506,10 +1508,11 @@ uint64_t helper_fsel (uint64_t arg1, uint64_t arg2, uint64_t arg3)
farg1.ll = arg1;
- if ((!float64_is_neg(farg1.d) || float64_is_zero(farg1.d)) && !float64_is_quiet_nan(farg1.d))
+ if ((!float64_is_neg(farg1.d) || float64_is_zero(farg1.d)) && !float64_is_any_nan(farg1.d)) {
return arg2;
- else
+ } else {
return arg3;
+ }
}
void helper_fcmpu (uint64_t arg1, uint64_t arg2, uint32_t crfD)
@@ -1519,8 +1522,8 @@ void helper_fcmpu (uint64_t arg1, uint64_t arg2, uint32_t crfD)
farg1.ll = arg1;
farg2.ll = arg2;
- if (unlikely(float64_is_quiet_nan(farg1.d) ||
- float64_is_quiet_nan(farg2.d))) {
+ if (unlikely(float64_is_any_nan(farg1.d) ||
+ float64_is_any_nan(farg2.d))) {
ret = 0x01UL;
} else if (float64_lt(farg1.d, farg2.d, &env->fp_status)) {
ret = 0x08UL;
@@ -1548,8 +1551,8 @@ void helper_fcmpo (uint64_t arg1, uint64_t arg2, uint32_t crfD)
farg1.ll = arg1;
farg2.ll = arg2;
- if (unlikely(float64_is_quiet_nan(farg1.d) ||
- float64_is_quiet_nan(farg2.d))) {
+ if (unlikely(float64_is_any_nan(farg1.d) ||
+ float64_is_any_nan(farg2.d))) {
ret = 0x01UL;
} else if (float64_lt(farg1.d, farg2.d, &env->fp_status)) {
ret = 0x08UL;
@@ -3434,8 +3437,9 @@ uint32_t helper_efdctsi (uint64_t val)
u.ll = val;
/* NaN are not treated the same way IEEE 754 does */
- if (unlikely(float64_is_quiet_nan(u.d)))
+ if (unlikely(float64_is_any_nan(u.d))) {
return 0;
+ }
return float64_to_int32(u.d, &env->vec_status);
}
@@ -3446,8 +3450,9 @@ uint32_t helper_efdctui (uint64_t val)
u.ll = val;
/* NaN are not treated the same way IEEE 754 does */
- if (unlikely(float64_is_quiet_nan(u.d)))
+ if (unlikely(float64_is_any_nan(u.d))) {
return 0;
+ }
return float64_to_uint32(u.d, &env->vec_status);
}
@@ -3458,8 +3463,9 @@ uint32_t helper_efdctsiz (uint64_t val)
u.ll = val;
/* NaN are not treated the same way IEEE 754 does */
- if (unlikely(float64_is_quiet_nan(u.d)))
+ if (unlikely(float64_is_any_nan(u.d))) {
return 0;
+ }
return float64_to_int32_round_to_zero(u.d, &env->vec_status);
}
@@ -3470,8 +3476,9 @@ uint64_t helper_efdctsidz (uint64_t val)
u.ll = val;
/* NaN are not treated the same way IEEE 754 does */
- if (unlikely(float64_is_quiet_nan(u.d)))
+ if (unlikely(float64_is_any_nan(u.d))) {
return 0;
+ }
return float64_to_int64_round_to_zero(u.d, &env->vec_status);
}
@@ -3482,8 +3489,9 @@ uint32_t helper_efdctuiz (uint64_t val)
u.ll = val;
/* NaN are not treated the same way IEEE 754 does */
- if (unlikely(float64_is_quiet_nan(u.d)))
+ if (unlikely(float64_is_any_nan(u.d))) {
return 0;
+ }
return float64_to_uint32_round_to_zero(u.d, &env->vec_status);
}
@@ -3494,8 +3502,9 @@ uint64_t helper_efdctuidz (uint64_t val)
u.ll = val;
/* NaN are not treated the same way IEEE 754 does */
- if (unlikely(float64_is_quiet_nan(u.d)))
+ if (unlikely(float64_is_any_nan(u.d))) {
return 0;
+ }
return float64_to_uint64_round_to_zero(u.d, &env->vec_status);
}
@@ -3531,8 +3540,9 @@ uint32_t helper_efdctsf (uint64_t val)
u.ll = val;
/* NaN are not treated the same way IEEE 754 does */
- if (unlikely(float64_is_quiet_nan(u.d)))
+ if (unlikely(float64_is_any_nan(u.d))) {
return 0;
+ }
tmp = uint64_to_float64(1ULL << 32, &env->vec_status);
u.d = float64_mul(u.d, tmp, &env->vec_status);
@@ -3546,8 +3556,9 @@ uint32_t helper_efdctuf (uint64_t val)
u.ll = val;
/* NaN are not treated the same way IEEE 754 does */
- if (unlikely(float64_is_quiet_nan(u.d)))
+ if (unlikely(float64_is_any_nan(u.d))) {
return 0;
+ }
tmp = uint64_to_float64(1ULL << 32, &env->vec_status);
u.d = float64_mul(u.d, tmp, &env->vec_status);
--
1.7.2.3
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [Qemu-devel] Re: [PATCH v2 1/2] target-ppc: fix sNaN propagation
2011-01-12 18:42 [Qemu-devel] [PATCH v2 1/2] target-ppc: fix sNaN propagation Aurelien Jarno
2011-01-12 18:42 ` [Qemu-devel] [PATCH 2/2] target-ppc: fix wrong NaN tests Aurelien Jarno
@ 2011-01-13 17:27 ` Nathan Froyd
1 sibling, 0 replies; 4+ messages in thread
From: Nathan Froyd @ 2011-01-13 17:27 UTC (permalink / raw)
To: Aurelien Jarno; +Cc: Peter Maydell, qemu-devel, Alexander Graf
On Wed, Jan 12, 2011 at 07:42:47PM +0100, Aurelien Jarno wrote:
> The current FPU code returns 0.0 if one of the operand is a
> signaling NaN and the VXSNAN exception is disabled.
>
> fload_invalid_op_excp() doesn't return a qNaN in case of a VXSNAN
> exception as the operand should be propagated instead of a new
> qNaN to be generated. Fix that by calling fload_invalid_op_excp()
> only for the exception generation (if enabled), and use the softfloat
> code to correctly compute the result.
>
> Cc: Alexander Graf <agraf@suse.de>
> Cc: Peter Maydell <peter.maydell@linaro.org>
> Cc: Nathan Froyd <froydnj@codesourcery.com>
> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
-Nathan
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Qemu-devel] Re: [PATCH 2/2] target-ppc: fix wrong NaN tests
2011-01-12 18:42 ` [Qemu-devel] [PATCH 2/2] target-ppc: fix wrong NaN tests Aurelien Jarno
@ 2011-01-13 17:27 ` Nathan Froyd
0 siblings, 0 replies; 4+ messages in thread
From: Nathan Froyd @ 2011-01-13 17:27 UTC (permalink / raw)
To: Aurelien Jarno; +Cc: Peter Maydell, qemu-devel, Alexander Graf
On Wed, Jan 12, 2011 at 07:42:48PM +0100, Aurelien Jarno wrote:
> Some tests in FPU emulation code were wrongly using float64_is_nan()
> before commit 185698715dfb18c82ad2a5dbc169908602d43e81, and wrongly
> using float64_is_quiet_nan() after. Fix them by using float64_is_any_nan()
> instead.
>
> Cc: Alexander Graf <agraf@suse.de>
> Cc: Peter Maydell <peter.maydell@linaro.org>
> Cc: Nathan Froyd <froydnj@codesourcery.com>
> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Reviewed-by: Nathan Froyd <froydnj@codesourcery.com>
-Nathan
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2011-01-13 17:27 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-01-12 18:42 [Qemu-devel] [PATCH v2 1/2] target-ppc: fix sNaN propagation Aurelien Jarno
2011-01-12 18:42 ` [Qemu-devel] [PATCH 2/2] target-ppc: fix wrong NaN tests Aurelien Jarno
2011-01-13 17:27 ` [Qemu-devel] " Nathan Froyd
2011-01-13 17:27 ` [Qemu-devel] Re: [PATCH v2 1/2] target-ppc: fix sNaN propagation Nathan Froyd
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