From: Stafford Horne <shorne@gmail.com>
To: cgen@sourceware.org
Cc: Openrisc <openrisc@lists.librecores.org>,
Stafford Horne <shorne@gmail.com>
Subject: [PATCH 1/2] cgen: Add unordered compare operation
Date: Sat, 01 Jun 2019 07:26:00 -0000 [thread overview]
Message-ID: <20190601072629.4070-2-shorne@gmail.com> (raw)
In-Reply-To: <20190601072629.4070-1-shorne@gmail.com>
On OpenRISC we have added FPU unordered comparison operations (NaN
detection). This patch adds the unordered operation which will generate
c hooks to be implemented in simulators.
An unordered comparison can now be defined as:
; Compare unordered (set flag if either r1 or r2 is NaN)
(set BI flag (unordered WI r1 r2))
; Compare unordered, greater than or equal
(set BI flag (or (unordered WI r1 r2)
(ge WI r1 r2)))
ChangeLog:
yyyy-mm-dd Stafford Horne <shorne@gmail.com>
* rtl-c.scm (unordered): New comparison operation.
* rtx-funcs.scm (unordered): New rtx node.
---
rtl-c.scm | 4 ++++
rtx-funcs.scm | 7 +++++++
2 files changed, 11 insertions(+)
diff --git a/rtl-c.scm b/rtl-c.scm
index 1a4b8b0..4d4d671 100644
--- a/rtl-c.scm
+++ b/rtl-c.scm
@@ -1897,6 +1897,10 @@
(define-fn geu (*estate* options mode s1 s2)
(s-cmpop *estate* 'geu ">=" mode s1 s2)
)
+(define-fn unordered (*estate* options mode s1 s2)
+ (s-cmpop *estate* 'unordered #f mode s1 s2)
+)
+
(define-fn member (*estate* options mode value set)
;; NOTE: There are multiple evalutions of VALUE in the generated code.
diff --git a/rtx-funcs.scm b/rtx-funcs.scm
index 6c28735..f16864a 100644
--- a/rtx-funcs.scm
+++ b/rtx-funcs.scm
@@ -1086,6 +1086,13 @@
COMPARE
#f
)
+; Detect NaNs
+(drn (unordered &options &mode s1 s2)
+ BI
+ (OPTIONS ANYNUMMODE RTX RTX) (NA NA MATCHEXPR MATCH2)
+ COMPARE
+ #f
+)
\f
; Set membership.
; Useful in ifield assertions.
--
2.21.0
next prev parent reply other threads:[~2019-06-01 7:26 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-01 7:26 [PATCH 0/2] CGEN unordered fpu compares + fixes Stafford Horne
2019-06-01 7:26 ` [PATCH 2/2] gen-doc: Updates for latest cpu definitions Stafford Horne
2019-06-01 7:26 ` Stafford Horne [this message]
2019-06-12 13:14 ` [PATCH 0/2] CGEN unordered fpu compares + fixes Stafford Horne
2019-06-12 14:36 ` Jose E. Marchesi
2019-06-12 15:04 ` Frank Ch. Eigler
2019-06-12 20:53 ` Stafford Horne
2019-06-12 21:54 ` Frank Ch. Eigler
2019-06-13 8:51 ` Jose E. Marchesi
2019-06-13 12:23 ` Stafford Horne
2019-06-13 15:02 ` Jose E. Marchesi
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