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[Qemu-devel] [PATCH] softfloat: Handle float_muladd_negate_c when produc
From: |
Richard Sandiford |
Subject: |
[Qemu-devel] [PATCH] softfloat: Handle float_muladd_negate_c when product is zero |
Date: |
Mon, 21 Jan 2013 21:32:37 +0000 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.1 (gnu/linux) |
Honour float_muladd_negate_c in the case where the product is zero and
c is nonzero. Previously we would fail to negate c.
Seen in (and tested against) the gfortran testsuite on MIPS.
Signed-off-by: Richard Sandiford <address@hidden>
---
fpu/softfloat.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index ac3d150..0028415 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -2234,6 +2234,9 @@ float32 float32_muladd(float32 a, float32 b, float32 c,
int flags STATUS_PARAM)
}
}
/* Zero plus something non-zero : just return the something */
+ if (flags & float_muladd_negate_c) {
+ signflip ^= 1;
+ }
return make_float32(float32_val(c) ^ (signflip << 31));
}
@@ -3787,6 +3790,9 @@ float64 float64_muladd(float64 a, float64 b, float64 c,
int flags STATUS_PARAM)
}
}
/* Zero plus something non-zero : just return the something */
+ if (flags & float_muladd_negate_c) {
+ signflip ^= 1;
+ }
return make_float64(float64_val(c) ^ ((uint64_t)signflip << 63));
}
--
1.7.11.7
- [Qemu-devel] [PATCH] softfloat: Handle float_muladd_negate_c when product is zero,
Richard Sandiford <=