On Wed, Mar 18 2015, Matt Turner wrote:
This patch implements _mesa_roundeven{f,}, a function similar to the
roundeven function added by a yet unimplemented technical specification
(ISO/IEC TS 18661-1:2014), with a small difference in behavior -- we
don't bother raising the inexact exception,
Eric's initial patch adding constant expression evaluation for
ir_unop_round_even used nearbyint. The open-coded _mesa_round_to_even
implementation came about without much explanation after a reviewer
asked whether nearbyint depended on the application not modifying the
rounding mode. Of course
On Fri, Mar 13 2015, Matt Turner wrote:
Perhaps something like the following?
Round \x to the nearest even integer (returned in floating-point
format).
I didn't read this closely enough the first time, but if I had I think
I could have short circuited a lot of the confusion.
On Thu, Mar 12, 2015 at 2:59 PM, Carl Worth cwo...@cworth.org wrote:
On Thu, Mar 12 2015, Matt Turner wrote:
+/* The C standard library has functions round()/rint()/nearbyint() that
round
+ * their arguments according to the rounding mode set in the floating-point
+ * control register. While
Eric's initial patch adding constant expression evaluation for
ir_unop_round_even used nearbyint. The open-coded _mesa_round_to_even
implementation came about without much explanation after a reviewer
asked whether nearbyint depended on the application not modifying the
rounding mode. Of course
Am 12.03.2015 um 23:53 schrieb Carl Worth:
On Thu, Mar 12 2015, Matt Turner wrote:
I think you misread. rint() *does* provide the behavior we want
(round-to-nearest, half to even) when the rounding mode is the default
round-to-nearest.
Thanks. I did at least verify that behaviorally as I
On Thu, Mar 12, 2015 at 3:53 PM, Carl Worth cwo...@cworth.org wrote:
On Thu, Mar 12 2015, Matt Turner wrote:
I think you misread. rint() *does* provide the behavior we want
(round-to-nearest, half to even) when the rounding mode is the default
round-to-nearest.
Thanks. I did at least verify
On Thu, Mar 12, 2015 at 2:59 PM, Carl Worth cwo...@cworth.org wrote:
On Thu, Mar 12 2015, Matt Turner wrote:
+/* The C standard library has functions round()/rint()/nearbyint() that
round
+ * their arguments according to the rounding mode set in the floating-point
+ * control register. While
On Thu, Mar 12 2015, Matt Turner wrote:
I think you misread. rint() *does* provide the behavior we want
(round-to-nearest, half to even) when the rounding mode is the default
round-to-nearest.
Thanks. I did at least verify that behaviorally as I just mentioned in a
separate mail.
As Eric
On Thu, Mar 12 2015, Matt Turner wrote:
+/* The C standard library has functions round()/rint()/nearbyint() that round
+ * their arguments according to the rounding mode set in the floating-point
+ * control register. While there are trunc()/ceil()/floor() functions that do
+ * a specific
On Thu, Mar 12 2015, Carl Worth wrote:
But beyond that, I'm actually confused---how can the default rounding
mode (rounding toward nearest number, right?) give us an adequate
implementation for roundeven()?
Of course, I had asked for (and received) a patch with a test. And the
test verifies
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