Background ---------- An overview email, describing the UPC-related changes is here: https://gcc.gnu.org/ml/gcc-patches/2015-12/msg00005.html
The GUPC branch is described here: http://gcc.gnu.org/projects/gupc.html The UPC-related source code differences are summarized here: http://gccupc.org/gupc-changes All languages (c, c++, fortran, go, lto, objc, obj-c++) have been bootstrapped; no test suite regressions were introduced, relative to the GCC trunk. If you are on the cc-list, your name was chosen either because you are listed as a maintainer for the area that applies to the patches described in this email, or you were a frequent contributor of patches made to files listed in this email. In the change log entries included in each patch, the directory containing the affected files is listed, followed by the files. When the patches are applied, the change log entries will be distributed to the appropriate ChangeLog file. Overview -------- UPC pointers-to-shared use a struct to describe their internal representation. For efficiency and correctness, ensure that if the struct's mode is TIMode that a pointer-to-shared parameter is passed in registers. Note that the parameter passing logic forces "C" pointer type parameters to be 'word mode', but that rule doesn't apply to UPC pointers-to-shared due to their "fat" struct representation. 2015-11-30 Gary Funck <g...@intrepid.com> gcc/config/i386/ * i386.c (classify_argument): check for UPC pointer-to-shared, on 64-bit target. (function_value_64): Do not force UPC pointers-to-shared to be returned in word mode. Index: gcc/config/i386/i386.c =================================================================== --- gcc/config/i386/i386.c (.../trunk) (revision 231059) +++ gcc/config/i386/i386.c (.../branches/gupc) (revision 231080) @@ -7943,6 +7943,15 @@ classify_argument (machine_mode mode, co && targetm.calls.must_pass_in_stack (mode, type)) return 0; + /* Special case check for pointer to shared, on 64-bit target. */ + if (TARGET_64BIT && mode == TImode + && type && TREE_CODE (type) == POINTER_TYPE + && SHARED_TYPE_P (TREE_TYPE (type))) + { + classes[0] = classes[1] = X86_64_INTEGER_CLASS; + return 2; + } + if (type && AGGREGATE_TYPE_P (type)) { int i; @@ -9536,7 +9545,8 @@ function_value_64 (machine_mode orig_mod return gen_rtx_REG (mode, regno); } - else if (POINTER_TYPE_P (valtype)) + else if (POINTER_TYPE_P (valtype) + && !SHARED_TYPE_P (TREE_TYPE (valtype))) { /* Pointers are always returned in word_mode. */ mode = word_mode; @@ -9680,6 +9690,11 @@ ix86_promote_function_mode (const_tree t { if (type != NULL_TREE && POINTER_TYPE_P (type)) { + if (SHARED_TYPE_P (TREE_TYPE (type))) + { + *punsignedp = 1; + return TYPE_MODE (upc_pts_rep_type_node); + } *punsignedp = POINTERS_EXTEND_UNSIGNED; return word_mode; }
