This patch adds a target hook that allows targets to return
the ABI associated with a particular function type. Generally,
when multiple ABIs are in use, it must be possible to tell from
a function type and its attributes which ABI it is using.
2019-09-11 Richard Sandiford <richard.sandif...@arm.com>
gcc/
* target.def (fntype_abi): New target hook.
* doc/tm.texi.in (TARGET_FNTYPE_ABI): Likewise.
* doc/tm.texi: Regenerate.
* target.h (predefined_function_abi): Declare.
* function-abi.cc (fntype_abi): Call targetm.calls.fntype_abi,
if defined.
* config/aarch64/aarch64.h (ARM_PCS_SIMD): New arm_pcs value.
* config/aarch64/aarch64.c: Include function-abi.h.
(aarch64_simd_abi, aarch64_fntype_abi): New functions.
(TARGET_FNTYPE_ABI): Define.
Index: gcc/target.def
===================================================================
--- gcc/target.def 2019-09-09 17:51:55.848574716 +0100
+++ gcc/target.def 2019-09-11 19:47:20.406290945 +0100
@@ -4892,6 +4892,15 @@ If this hook is not defined, then FUNCTI
bool, (const unsigned int regno),
default_function_value_regno_p)
+DEFHOOK
+(fntype_abi,
+ "Return the ABI used by a function with type @var{type}; see the\n\
+definition of @code{predefined_function_abi} for details of the ABI\n\
+descriptor. Targets only need to define this hook if they support\n\
+interoperability between several ABIs in the same translation unit.",
+ const predefined_function_abi &, (const_tree type),
+ NULL)
+
/* ??? Documenting this hook requires a GFDL license grant. */
DEFHOOK_UNDOC
(internal_arg_pointer,
Index: gcc/doc/tm.texi.in
===================================================================
--- gcc/doc/tm.texi.in 2019-09-10 19:57:04.713041281 +0100
+++ gcc/doc/tm.texi.in 2019-09-11 19:47:20.402290974 +0100
@@ -1709,6 +1709,11 @@ must be defined. Modern ports should de
@cindex call-used register
@cindex call-clobbered register
@cindex call-saved register
+@hook TARGET_FNTYPE_ABI
+
+@cindex call-used register
+@cindex call-clobbered register
+@cindex call-saved register
@hook TARGET_HARD_REGNO_CALL_PART_CLOBBERED
@hook TARGET_REMOVE_EXTRA_CALL_PRESERVED_REGS
Index: gcc/doc/tm.texi
===================================================================
--- gcc/doc/tm.texi 2019-09-10 19:57:04.713041281 +0100
+++ gcc/doc/tm.texi 2019-09-11 19:47:20.402290974 +0100
@@ -1898,6 +1898,16 @@ must be defined. Modern ports should de
@cindex call-used register
@cindex call-clobbered register
@cindex call-saved register
+@deftypefn {Target Hook} {const predefined_function_abi &} TARGET_FNTYPE_ABI
(const_tree @var{type})
+Return the ABI used by a function with type @var{type}; see the
+definition of @code{predefined_function_abi} for details of the ABI
+descriptor. Targets only need to define this hook if they support
+interoperability between several ABIs in the same translation unit.
+@end deftypefn
+
+@cindex call-used register
+@cindex call-clobbered register
+@cindex call-saved register
@deftypefn {Target Hook} bool TARGET_HARD_REGNO_CALL_PART_CLOBBERED (rtx_insn
*@var{insn}, unsigned int @var{regno}, machine_mode @var{mode})
This hook should return true if @var{regno} is partly call-saved and
partly call-clobbered, and if a value of mode @var{mode} would be partly
Index: gcc/target.h
===================================================================
--- gcc/target.h 2019-08-20 09:52:11.022820825 +0100
+++ gcc/target.h 2019-09-11 19:47:20.406290945 +0100
@@ -152,6 +152,9 @@ struct noce_if_info;
/* This is defined in calls.h. */
class function_arg_info;
+/* This is defined in function-abi.h. */
+class predefined_function_abi;
+
/* These are defined in tree-vect-stmts.c. */
extern tree stmt_vectype (class _stmt_vec_info *);
extern bool stmt_in_inner_loop_p (class _stmt_vec_info *);
Index: gcc/function-abi.cc
===================================================================
--- gcc/function-abi.cc 2019-09-11 19:47:07.490381964 +0100
+++ gcc/function-abi.cc 2019-09-11 19:47:20.402290974 +0100
@@ -132,6 +132,8 @@ const predefined_function_abi &
fntype_abi (const_tree type)
{
gcc_assert (FUNC_OR_METHOD_TYPE_P (type));
+ if (targetm.calls.fntype_abi)
+ return targetm.calls.fntype_abi (type);
return default_function_abi;
}
Index: gcc/config/aarch64/aarch64.h
===================================================================
--- gcc/config/aarch64/aarch64.h 2019-09-05 08:49:31.193737018 +0100
+++ gcc/config/aarch64/aarch64.h 2019-09-11 19:47:20.398291002 +0100
@@ -783,6 +783,7 @@ #define TARGET_ILP32 (aarch64_abi & AARC
enum arm_pcs
{
ARM_PCS_AAPCS64, /* Base standard AAPCS for 64 bit. */
+ ARM_PCS_SIMD, /* For aarch64_vector_pcs functions. */
ARM_PCS_UNKNOWN
};
Index: gcc/config/aarch64/aarch64.c
===================================================================
--- gcc/config/aarch64/aarch64.c 2019-09-11 19:47:00.322432478 +0100
+++ gcc/config/aarch64/aarch64.c 2019-09-11 19:47:20.398291002 +0100
@@ -74,6 +74,7 @@ #define INCLUDE_STRING
#include "rtx-vector-builder.h"
#include "intl.h"
#include "expmed.h"
+#include "function-abi.h"
/* This file should be included last. */
#include "target-def.h"
@@ -1365,6 +1366,24 @@ #define CASE(UPPER, LOWER, VALUE) case A
gcc_unreachable ();
}
+/* Return the descriptor of the SIMD ABI. */
+
+static const predefined_function_abi &
+aarch64_simd_abi (void)
+{
+ predefined_function_abi &simd_abi = function_abis[ARM_PCS_SIMD];
+ if (!simd_abi.initialized_p ())
+ {
+ HARD_REG_SET full_reg_clobbers
+ = default_function_abi.full_reg_clobbers ();
+ for (int regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
+ if (FP_SIMD_SAVED_REGNUM_P (regno))
+ CLEAR_HARD_REG_BIT (full_reg_clobbers, regno);
+ simd_abi.initialize (ARM_PCS_SIMD, full_reg_clobbers);
+ }
+ return simd_abi;
+}
+
/* Generate code to enable conditional branches in functions over 1 MiB. */
const char *
aarch64_gen_far_branch (rtx * operands, int pos_label, const char * dest,
@@ -1810,6 +1829,16 @@ aarch64_hard_regno_mode_ok (unsigned reg
return false;
}
+/* Implement TARGET_FNTYPE_ABI. */
+
+static const predefined_function_abi &
+aarch64_fntype_abi (const_tree fntype)
+{
+ if (lookup_attribute ("aarch64_vector_pcs", TYPE_ATTRIBUTES (fntype)))
+ return aarch64_simd_abi ();
+ return default_function_abi;
+}
+
/* Return true if this is a definition of a vectorized simd function. */
static bool
@@ -20826,6 +20855,9 @@ #define TARGET_COMP_TYPE_ATTRIBUTES aarc
#undef TARGET_GET_MULTILIB_ABI_NAME
#define TARGET_GET_MULTILIB_ABI_NAME aarch64_get_multilib_abi_name
+#undef TARGET_FNTYPE_ABI
+#define TARGET_FNTYPE_ABI aarch64_fntype_abi
+
#if CHECKING_P
#undef TARGET_RUN_TARGET_SELFTESTS
#define TARGET_RUN_TARGET_SELFTESTS selftest::aarch64_run_selftests
