[libclc] 83/291: Add rhadd builtin

[Andreas Beckmann]

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anbe pushed a commit to branch master
in repository libclc.

commit ebb0f60ffe153973352146e6cfa2174614344b91
Author: Aaron Watry <awatry at gmail.com>
Date:   Thu Aug 15 19:21:10 2013 +0000

    Add rhadd builtin
    
    rhadd = (x+y+1)>>1
    
    Implemented as:
    (x>>1) + (y>>1) + ((x&1)|(y&1))
    
    This prevents us having to do assembly addition and overflow detection
    
    Reviewed-by: Tom Stellard <thomas.stellard at amd.com>
    
    git-svn-id: https://llvm.org/svn/llvm-project/libclc/trunk@188477 91177308-0d34-0410-b5e6-96231b3b80d8
---
 generic/include/clc/clc.h             | 1 +
 generic/include/clc/integer/rhadd.h   | 2 ++
 generic/include/clc/integer/rhadd.inc | 1 +
 generic/lib/SOURCES                   | 1 +
 generic/lib/integer/rhadd.cl          | 4 ++++
 generic/lib/integer/rhadd.inc         | 6 ++++++
 6 files changed, 15 insertions(+)

diff --git a/generic/include/clc/clc.h b/generic/include/clc/clc.h
index 38f71db..ae212ed 100644
--- a/generic/include/clc/clc.h
+++ b/generic/include/clc/clc.h
@@ -68,6 +68,7 @@
 #include <clc/integer/hadd.h>
 #include <clc/integer/mad24.h>
 #include <clc/integer/mul24.h>
+#include <clc/integer/rhadd.h>
 #include <clc/integer/rotate.h>
 #include <clc/integer/sub_sat.h>
 #include <clc/integer/upsample.h>
diff --git a/generic/include/clc/integer/rhadd.h b/generic/include/clc/integer/rhadd.h
new file mode 100644
index 0000000..69b43fa
--- /dev/null
+++ b/generic/include/clc/integer/rhadd.h
@@ -0,0 +1,2 @@
+#define __CLC_BODY <clc/integer/rhadd.inc>
+#include <clc/integer/gentype.inc>
diff --git a/generic/include/clc/integer/rhadd.inc b/generic/include/clc/integer/rhadd.inc
new file mode 100644
index 0000000..88ccaf0
--- /dev/null
+++ b/generic/include/clc/integer/rhadd.inc
@@ -0,0 +1 @@
+_CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE rhadd(__CLC_GENTYPE x, __CLC_GENTYPE y);
diff --git a/generic/lib/SOURCES b/generic/lib/SOURCES
index e936fbc..5a68d07 100644
--- a/generic/lib/SOURCES
+++ b/generic/lib/SOURCES
@@ -14,6 +14,7 @@ integer/clz_impl.ll
 integer/hadd.cl
 integer/mad24.cl
 integer/mul24.cl
+integer/rhadd.cl
 integer/rotate.cl
 integer/sub_sat.cl
 integer/sub_sat_if.ll
diff --git a/generic/lib/integer/rhadd.cl b/generic/lib/integer/rhadd.cl
new file mode 100644
index 0000000..c985870
--- /dev/null
+++ b/generic/lib/integer/rhadd.cl
@@ -0,0 +1,4 @@
+#include <clc/clc.h>
+
+#define __CLC_BODY <rhadd.inc>
+#include <clc/integer/gentype.inc>
diff --git a/generic/lib/integer/rhadd.inc b/generic/lib/integer/rhadd.inc
new file mode 100644
index 0000000..3d60768
--- /dev/null
+++ b/generic/lib/integer/rhadd.inc
@@ -0,0 +1,6 @@
+//rhadd = (x+y+1)>>1
+//This can be simplified to x>>1 + y>>1 + (1 if either x or y have the 1s bit set)
+//This saves us having to do any checks for overflow in the addition sums
+_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE rhadd(__CLC_GENTYPE x, __CLC_GENTYPE y) {
+    return (x>>(__CLC_GENTYPE)1)+(y>>(__CLC_GENTYPE)1)+((x&(__CLC_GENTYPE)1)|(y&(__CLC_GENTYPE)1));
+}

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