[libclc] Move several integer functions to CLC library (llvm#116786)

This commit moves over the OpenCL clz, hadd, mad24, mad_hi, mul24,
mul_hi, popcount, rhadd, and upsample builtins to the CLC library.

This commit also optimizes the vector forms of the mul_hi and upsample
builtins to consistently remain in vector types, instead of recursively
splitting vectors down to the scalar form.

The OpenCL mad_hi builtin wasn't previously publicly available from the
CLC libraries, as it was hash-defined to mul_hi in the header files.
That issue has been fixed, and mad_hi is now exposed.

The custom AMD implementation/workaround for popcount has been removed
as it was only required for clang < 7.

There are still two integer functions which haven't been moved over. The
OpenCL mad_sat builtin uses many of the other integer builtins, and
would benefit from optimization for vector types. That can take place in
a follow-up commit. The rotate builtin could similarly use some more
dedicated focus, potentially using clang builtins.

Author: frasercrmck

libclc/amdgcn/lib/SOURCES

@@ -1,5 +1,4 @@
 cl_khr_int64_extended_atomics/minmax_helpers.ll
-integer/popcount.cl
 math/fmax.cl
 math/fmin.cl
 math/ldexp.cl

libclc/amdgcn/lib/integer/popcount.cl

@@ -0,0 +1,12 @@
+#ifndef __CLC_INTEGER_CLC_CLZ_H__
+#define __CLC_INTEGER_CLC_CLZ_H__
+
+#define __CLC_FUNCTION __clc_clz
+#define __CLC_BODY <clc/shared/unary_decl.inc>
+
+#include <clc/integer/gentype.inc>
+
+#undef __CLC_BODY
+#undef __CLC_FUNCTION
+
+#endif // __CLC_INTEGER_CLC_CLZ_H__

libclc/amdgcn/lib/integer/popcount.inc

@@ -0,0 +1,12 @@
+#ifndef __CLC_INTEGER_CLC_HADD_H__
+#define __CLC_INTEGER_CLC_HADD_H__
+
+#define __CLC_FUNCTION __clc_hadd
+#define __CLC_BODY <clc/shared/binary_decl.inc>
+
+#include <clc/integer/gentype.inc>
+
+#undef __CLC_BODY
+#undef __CLC_FUNCTION
+
+#endif // __CLC_INTEGER_CLC_HADD_H__

libclc/clc/include/clc/integer/clc_clz.h

@@ -0,0 +1,12 @@
+#ifndef __CLC_INTEGER_CLC_MAD24_H__
+#define __CLC_INTEGER_CLC_MAD24_H__
+
+#define __CLC_FUNCTION __clc_mad24
+#define __CLC_BODY <clc/shared/ternary_decl.inc>
+
+#include <clc/integer/gentype24.inc>
+
+#undef __CLC_BODY
+#undef __CLC_FUNCTION
+
+#endif // __CLC_INTEGER_CLC_MAD24_H__

libclc/clc/include/clc/integer/clc_hadd.h

@@ -0,0 +1,8 @@
+#ifndef __CLC_INTEGER_CLC_MAD_HI_H__
+#define __CLC_INTEGER_CLC_MAD_HI_H__
+
+#include <clc/integer/clc_mul_hi.h>
+
+#define __clc_mad_hi(a, b, c) (__clc_mul_hi((a), (b)) + (c))
+
+#endif // __CLC_INTEGER_CLC_MAD_HI_H__

libclc/clc/include/clc/integer/clc_mad24.h

@@ -0,0 +1,12 @@
+#ifndef __CLC_INTEGER_CLC_MUL24_H__
+#define __CLC_INTEGER_CLC_MUL24_H__
+
+#define __CLC_FUNCTION __clc_mul24
+#define __CLC_BODY <clc/shared/binary_decl.inc>
+
+#include <clc/integer/gentype24.inc>
+
+#undef __CLC_BODY
+#undef __CLC_FUNCTION
+
+#endif // __CLC_INTEGER_CLC_MUL24_H__

libclc/clc/include/clc/integer/clc_mad_hi.h

@@ -0,0 +1,12 @@
+#ifndef __CLC_INTEGER_CLC_MUL_HI_H__
+#define __CLC_INTEGER_CLC_MUL_HI_H__
+
+#define __CLC_FUNCTION __clc_mul_hi
+#define __CLC_BODY <clc/shared/binary_decl.inc>
+
+#include <clc/integer/gentype.inc>
+
+#undef __CLC_BODY
+#undef __CLC_FUNCTION
+
+#endif // __CLC_INTEGER_CLC_MUL_HI_H__

libclc/clc/include/clc/integer/clc_mul24.h

@@ -0,0 +1,12 @@
+#ifndef __CLC_INTEGER_CLC_POPCOUNT_H__
+#define __CLC_INTEGER_CLC_POPCOUNT_H__
+
+#define __CLC_FUNCTION __clc_popcount
+#define __CLC_BODY <clc/shared/unary_decl.inc>
+
+#include <clc/integer/gentype.inc>
+
+#undef __CLC_INTRINSIC
+#undef __CLC_FUNCTION
+
+#endif // __CLC_INTEGER_CLC_POPCOUNT_H__