[libclc] Move lgamma, lgamma_r & tgamma to CLC library (#134053)

Also enable half-precision variants of tgamma, which were previously
missing.

Note that unlike recent work, these builtins are not vectorized as part
of this commit. Ultimately all three call into lgamma_r, which has heavy
control flow (including switch statements) that would be difficult to
vectorize. Additionally the lgamma_r algorithm is copyrighted to SunPro
so may need a rewrite in the future anyway.

There are no codegen changes (to non-SPIR-V targets) with this commit,
aside from the new half builtins.

Author: frasercrmck

libclc/generic/include/clc/math/lgamma_r.inc renamed to libclc/clc/include/clc/math/clc_lgamma.h

@@ -6,6 +6,15 @@
 //
 //===----------------------------------------------------------------------===//
 
-_CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE lgamma_r(__CLC_GENTYPE x, global __CLC_INTN *iptr);
-_CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE lgamma_r(__CLC_GENTYPE x, local __CLC_INTN *iptr);
-_CLC_OVERLOAD _CLC_DECL __CLC_GENTYPE lgamma_r(__CLC_GENTYPE x, private __CLC_INTN *iptr);
+#ifndef __CLC_MATH_CLC_LGAMMA_H__
+#define __CLC_MATH_CLC_LGAMMA_H__
+
+#define __CLC_BODY <clc/math/unary_decl.inc>
+#define __CLC_FUNCTION __clc_lgamma
+
+#include <clc/math/gentype.inc>
+
+#undef __CLC_BODY
+#undef __CLC_FUNCTION
+
+#endif // __CLC_MATH_CLC_LGAMMA_H__

libclc/clc/include/clc/math/clc_lgamma_r.h

@@ -0,0 +1,20 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __CLC_MATH_CLC_LGAMMA_R_H__
+#define __CLC_MATH_CLC_LGAMMA_R_H__
+
+#define __CLC_FUNCTION __clc_lgamma_r
+#define __CLC_BODY <clc/math/unary_decl_with_int_ptr.inc>
+
+#include <clc/math/gentype.inc>
+
+#undef __CLC_BODY
+#undef __CLC_FUNCTION
+
+#endif // __CLC_MATH_CLC_LGAMMA_R_H__

libclc/clc/include/clc/math/clc_tgamma.h

@@ -0,0 +1,20 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef __CLC_MATH_CLC_TGAMMA_H__
+#define __CLC_MATH_CLC_TGAMMA_H__
+
+#define __CLC_BODY <clc/math/unary_decl.inc>
+#define __CLC_FUNCTION __clc_tgamma
+
+#include <clc/math/gentype.inc>
+
+#undef __CLC_BODY
+#undef __CLC_FUNCTION
+
+#endif // __CLC_MATH_CLC_TGAMMA_H__

libclc/generic/lib/math/lgamma_r.inc renamed to libclc/clc/include/clc/math/unary_def_via_fp32.inc

@@ -6,9 +6,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE lgamma_r(__CLC_GENTYPE x, __CLC_ADDRSPACE __CLC_INTN *iptr) {
-    __CLC_INTN private_iptr;
-    __CLC_GENTYPE ret = lgamma_r(x, &private_iptr);
-    *iptr = private_iptr;
-    return ret;
+_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE __CLC_FUNCTION(__CLC_GENTYPE x) {
+  return __CLC_CONVERT_GENTYPE(__CLC_FUNCTION(__CLC_CONVERT_FLOATN(x)));
 }

libclc/clc/lib/generic/SOURCES

@@ -45,6 +45,8 @@ math/clc_floor.cl
 math/clc_frexp.cl
 math/clc_hypot.cl
 math/clc_ldexp.cl
+math/clc_lgamma.cl
+math/clc_lgamma_r.cl
 math/clc_log.cl
 math/clc_log10.cl
 math/clc_log1p.cl
@@ -79,6 +81,7 @@ math/clc_sqrt.cl
 math/clc_sw_fma.cl
 math/clc_tables.cl
 math/clc_tanpi.cl
+math/clc_tgamma.cl
 math/clc_trunc.cl
 relational/clc_all.cl
 relational/clc_any.cl

libclc/clc/lib/generic/math/clc_lgamma.cl

@@ -0,0 +1,13 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include <clc/internal/clc.h>
+#include <clc/math/clc_lgamma_r.h>
+
+#define __CLC_BODY <clc_lgamma.inc>
+#include <clc/math/gentype.inc>

libclc/clc/lib/generic/math/clc_lgamma.inc

@@ -0,0 +1,12 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE __clc_lgamma(__CLC_GENTYPE x) {
+  __CLC_INTN s;
+  return __clc_lgamma_r(x, &s);
+}