Hi,
This patch introduces TARGET_C_EXCESS_PRECISION. This hook takes a tri-state
argument, one of EXCESS_PRECISION_TYPE_IMPLICIT,
EXCESS_PRECISION_TYPE_STANDARD, EXCESS_PRECISION_TYPE_FAST. Which relate to
the implicit extra precision added by the target, the excess precision that
should be guaranteed for -fexcess-precision=standard, and the excess
precision that should be added for performance under -fexcess-precision=fast .
Bootstrapped and tested in sequence with the other patches in this series
on Arch64, and as a standalone patch on x86_64.
OK?
Thanks
James
---
gcc/
2016-09-30 James Greenhalgh <[email protected]>
* target.def (excess_precision): New hook.
* target.h (flt_eval_method): New.
(excess_precision_type): Likewise.
* targhooks.c (default_excess_precision): New.
* targhooks.h (default_excess_precision): New.
* doc/tm.texi.in (TARGET_EXCESS_PRECISION): New.
* doc/tm.texi: Regenerate.
diff --git a/gcc/coretypes.h b/gcc/coretypes.h
index fe1e984..26b0fa3 100644
--- a/gcc/coretypes.h
+++ b/gcc/coretypes.h
@@ -359,6 +359,24 @@ enum memmodel
MEMMODEL_SYNC_SEQ_CST = MEMMODEL_SEQ_CST | MEMMODEL_SYNC
};
+/* enums used by the targetm.excess_precision hook. */
+
+enum flt_eval_method
+{
+ FLT_EVAL_METHOD_UNPREDICTABLE = -1,
+ FLT_EVAL_METHOD_PROMOTE_TO_FLOAT = 0,
+ FLT_EVAL_METHOD_PROMOTE_TO_DOUBLE = 1,
+ FLT_EVAL_METHOD_PROMOTE_TO_LONG_DOUBLE = 2,
+ FLT_EVAL_METHOD_PROMOTE_TO_FLOAT16 = 16
+};
+
+enum excess_precision_type
+{
+ EXCESS_PRECISION_TYPE_IMPLICIT,
+ EXCESS_PRECISION_TYPE_STANDARD,
+ EXCESS_PRECISION_TYPE_FAST
+};
+
/* Support for user-provided GGC and PCH markers. The first parameter
is a pointer to a pointer, the second a cookie. */
typedef void (*gt_pointer_operator) (void *, void *);
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 8a98ba4..0bdae58 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -947,6 +947,10 @@ sign-extend the result to 64 bits. On such machines, set
Do not define this macro if it would never modify @var{m}.
@end defmac
+@deftypefn {Target Hook} {enum flt_eval_method} TARGET_C_EXCESS_PRECISION (enum excess_precision_type @var{type})
+Return a value, with the same meaning as @code{FLT_EVAL_METHOD} C that describes which excess precision should be applied. @var{type} is either @code{EXCESS_PRECISION_TYPE_IMPLICIT}, @code{EXCESS_PRECISION_TYPE_FAST}, or @code{EXCESS_PRECISION_TYPE_STANDARD}. For @code{EXCESS_PRECISION_TYPE_IMPLICIT}, the target should return which precision and range operations will be implictly evaluated in regardless of the excess precision explicitly added. For @code{EXCESS_PRECISION_TYPE_STANDARD} and @code{EXCESS_PRECISION_TYPE_FAST}, the target should return the explicit excess precision that should be added depending on the value set for @code{-fexcess-precision=[standard|fast]}.
+@end deftypefn
+
@deftypefn {Target Hook} machine_mode TARGET_PROMOTE_FUNCTION_MODE (const_tree @var{type}, machine_mode @var{mode}, int *@var{punsignedp}, const_tree @var{funtype}, int @var{for_return})
Like @code{PROMOTE_MODE}, but it is applied to outgoing function arguments or
function return values. The target hook should return the new mode
diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
index f1cfc86..7c7af33 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -921,6 +921,8 @@ sign-extend the result to 64 bits. On such machines, set
Do not define this macro if it would never modify @var{m}.
@end defmac
+@hook TARGET_C_EXCESS_PRECISION
+
@hook TARGET_PROMOTE_FUNCTION_MODE
@defmac PARM_BOUNDARY
diff --git a/gcc/target.def b/gcc/target.def
index 83373a5..1542692 100644
--- a/gcc/target.def
+++ b/gcc/target.def
@@ -5402,6 +5402,23 @@ DEFHOOK_UNDOC
machine_mode, (char c),
default_mode_for_suffix)
+DEFHOOK
+(excess_precision,
+ "Return a value, with the same meaning as @code{FLT_EVAL_METHOD} C that\
+ describes which excess precision should be applied. @var{type} is\
+ either @code{EXCESS_PRECISION_TYPE_IMPLICIT},\
+ @code{EXCESS_PRECISION_TYPE_FAST}, or\
+ @code{EXCESS_PRECISION_TYPE_STANDARD}. For\
+ @code{EXCESS_PRECISION_TYPE_IMPLICIT}, the target should return which\
+ precision and range operations will be implictly evaluated in regardless\
+ of the excess precision explicitly added. For\
+ @code{EXCESS_PRECISION_TYPE_STANDARD} and\
+ @code{EXCESS_PRECISION_TYPE_FAST}, the target should return the\
+ explicit excess precision that should be added depending on the\
+ value set for @code{-fexcess-precision=[standard|fast]}.",
+ enum flt_eval_method, (enum excess_precision_type type),
+ default_excess_precision)
+
HOOK_VECTOR_END (c)
/* Functions specific to the C++ frontend. */
diff --git a/gcc/targhooks.c b/gcc/targhooks.c
index d75650f..08d0b35 100644
--- a/gcc/targhooks.c
+++ b/gcc/targhooks.c
@@ -2110,4 +2110,12 @@ default_max_noce_ifcvt_seq_cost (edge e)
return BRANCH_COST (true, predictable_p) * COSTS_N_INSNS (3);
}
+/* Default implementation of TARGET_EXCESS_PRECISION. */
+
+enum flt_eval_method
+default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED)
+{
+ return FLT_EVAL_METHOD_PROMOTE_TO_FLOAT;
+}
+
#include "gt-targhooks.h"
diff --git a/gcc/targhooks.h b/gcc/targhooks.h
index 3356f0a..3fabde7 100644
--- a/gcc/targhooks.h
+++ b/gcc/targhooks.h
@@ -263,4 +263,7 @@ extern bool default_optab_supported_p (int, machine_mode, machine_mode,
extern unsigned int default_max_noce_ifcvt_seq_cost (edge);
+extern enum flt_eval_method
+default_excess_precision (enum excess_precision_type ATTRIBUTE_UNUSED);
+
#endif /* GCC_TARGHOOKS_H */
