From: Christophe Lyon <christophe.lyon@st.com>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [PATCH] rsqrte_f32: No need to copy sign bit.
Date: Mon, 3 Oct 2011 16:28:07 +0200 [thread overview]
Message-ID: <1317652087-27288-1-git-send-email-christophe.lyon@st.com> (raw)
Indeed, the result is known to be always positive.
Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
---
target-arm/helper.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)
diff --git a/target-arm/helper.c b/target-arm/helper.c
index d3a3ba2..ff5456c 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -3039,8 +3039,7 @@ float32 HELPER(rsqrte_f32)(float32 a, CPUState *env)
val64 = float64_val(f64);
- val = ((val64 >> 63) & 0x80000000)
- | ((result_exp & 0xff) << 23)
+ val = ((result_exp & 0xff) << 23)
| ((val64 >> 29) & 0x7fffff);
return make_float32(val);
}
--
1.7.6.4
next reply other threads:[~2011-10-03 14:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-03 14:28 Christophe Lyon [this message]
2011-10-08 22:57 ` [Qemu-devel] [PATCH] rsqrte_f32: No need to copy sign bit Peter Maydell
2011-10-10 11:26 ` Christophe Lyon
2011-10-10 12:26 ` Peter Maydell
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