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[Qemu-devel] [PATCH v2 4/8] softfloat: fix float{32, 64}_maybe_silence_n
From: |
Aurelien Jarno |
Subject: |
[Qemu-devel] [PATCH v2 4/8] softfloat: fix float{32, 64}_maybe_silence_nan() for MIPS |
Date: |
Tue, 4 Jan 2011 16:15:46 +0100 |
On targets that define sNaN with the sNaN bit as one, simply clearing
this bit may correspond to an infinite value.
Convert it to a default NaN if SNAN_BIT_IS_ONE, as it corresponds to
the MIPS implementation, the only emulated CPU with SNAN_BIT_IS_ONE.
When other CPU of this type are added, this might be updated to include
more cases.
Signed-off-by: Aurelien Jarno <address@hidden>
---
fpu/softfloat-specialize.h | 20 ++++++++++++++------
1 files changed, 14 insertions(+), 6 deletions(-)
diff --git a/fpu/softfloat-specialize.h b/fpu/softfloat-specialize.h
index 0003cbe..ac26214 100644
--- a/fpu/softfloat-specialize.h
+++ b/fpu/softfloat-specialize.h
@@ -107,13 +107,17 @@ int float32_is_signaling_nan( float32 a_ )
float32 float32_maybe_silence_nan( float32 a_ )
{
if (float32_is_signaling_nan(a_)) {
- bits32 a = float32_val(a_);
#if SNAN_BIT_IS_ONE
- a &= ~(1 << 22);
+# if defined(TARGET_MIPS)
+ return float32_default_nan;
+# else
+# error Rules for silencing a signaling NaN are target-specific
+# endif
#else
+ bits32 a = float32_val(a_);
a |= (1 << 22);
-#endif
return make_float32(a);
+#endif
}
return a_;
}
@@ -322,13 +326,17 @@ int float64_is_signaling_nan( float64 a_ )
float64 float64_maybe_silence_nan( float64 a_ )
{
if (float64_is_signaling_nan(a_)) {
- bits64 a = float64_val(a_);
#if SNAN_BIT_IS_ONE
- a &= ~LIT64( 0x0008000000000000 );
+# if defined(TARGET_MIPS)
+ return float64_default_nan;
+# else
+# error Rules for silencing a signaling NaN are target-specific
+# endif
#else
+ bits64 a = float64_val(a_);
a |= LIT64( 0x0008000000000000 );
-#endif
return make_float64(a);
+#endif
}
return a_;
}
--
1.7.2.3
- [Qemu-devel] (no subject), Aurelien Jarno, 2011/01/04
- [Qemu-devel] [PATCH v2 1/8] softfloat: remove HPPA specific code, Aurelien Jarno, 2011/01/04
- [Qemu-devel] [PATCH v2 3/8] softfloat: rename *IsNaN variables to *IsQuietNaN, Aurelien Jarno, 2011/01/04
- [Qemu-devel] [PATCH v2 4/8] softfloat: fix float{32, 64}_maybe_silence_nan() for MIPS,
Aurelien Jarno <=
- [Qemu-devel] [PATCH v2 5/8] softfloat: add float{x80, 128}_maybe_silence_nan(), Aurelien Jarno, 2011/01/04
- [Qemu-devel] [PATCH v2 8/8] target-ppc: Implement correct NaN propagation rules, Aurelien Jarno, 2011/01/04
- [Qemu-devel] [PATCH v2 2/8] softfloat: use bits32 instead of uint32, Aurelien Jarno, 2011/01/04
- [Qemu-devel] [PATCH v2 6/8] softfloat: use float{32, 64, x80, 128}_maybe_silence_nan(), Aurelien Jarno, 2011/01/04