Patchwork [3/5] target-arm: Introduce float64_256 and float64_512 constants.

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Submitter Christophe LYON
Date Feb. 21, 2011, 4:38 p.m.
Message ID <1298306328-25643-4-git-send-email-christophe.lyon@st.com>
Download mbox | patch
Permalink /patch/83854/
State New
Headers show

Comments

Christophe LYON - Feb. 21, 2011, 4:38 p.m.
These two constants will be used by helper functions such as recpe_f32
and rsqrte_f32.

Signed-off-by: Christophe Lyon <christophe.lyon@st.com>
---
 target-arm/helper.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
Peter Maydell - Feb. 22, 2011, 11:57 a.m.
On 21 February 2011 16:38, Christophe Lyon <christophe.lyon@st.com> wrote:
> These two constants will be used by helper functions such as recpe_f32
> and rsqrte_f32.
>
> Signed-off-by: Christophe Lyon <christophe.lyon@st.com>

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>

Patch

diff --git a/target-arm/helper.c b/target-arm/helper.c
index 7f63a28..30c1809 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -2687,6 +2687,11 @@  float32 HELPER(rsqrts_f32)(float32 a, float32 b, CPUState *env)
 
 /* NEON helpers.  */
 
+/* Constants 256 and 512 are used in some helpers; we avoid relying on
+ * int->float conversions at run-time.  */
+#define float64_256 make_float64(0x4070000000000000LL)
+#define float64_512 make_float64(0x4080000000000000LL)
+
 /* TODO: The architecture specifies the value that the estimate functions
    should return.  We return the exact reciprocal/root instead.  */
 float32 HELPER(recpe_f32)(float32 a, CPUState *env)