[BRIGFE] phsa-specific optimizations

Add flag -fassume-phsa that is on by default. If -fno-assume-phsa
is given, these optimizations are disabled.

With this flag, gccbrig can generate GENERIC that assumes we are
targeting a phsa-runtime based implementation, which allows us
to expose the work-item context accesses to retrieve WI IDs etc.
which helps optimizers.

First optimization that takes advantage of this is to get rid of
the setworkitemid calls whenever we have non-inlined calls that
use IDs internally.

Other optimizations added in this commit:

- expand absoluteid to similar level of simplicity as workitemid.
At the moment absoluteid is the best indexing ID to end up with
WG vectorization.
- propagate ID variables closer to their uses. This is mainly
to avoid known useless casts, which confuse at least scalar
evolution analysis.
- use signed long long for storing IDs. Unsigned integers have
defined wraparound semantics, which confuse at least scalar
evolution analysis, leading to unvectorizable WI loops.
- also refactor some BRIG function generation helpers to brig_function.
- no point in having the wi-loop as a for-loop. It's really
a do...while and SCEV can analyze it just fine still.
- add consts to ptrs etc. in BRIG builtin defs.
Improves optimization opportunities.
- add qualifiers to generated function parameters.
Const and restrict on the hidden local/private pointers,
the arg buffer and the context pointer help some optimizations.

From-SVN: r259957

1 files changed, 14 insertions, 13 deletions

diff --git a/gcc/brig-builtins.def b/gcc/brig-builtins.def
index f94f7e62bb2..c2e8d2c034d 100644
--- a/gcc/brig-builtins.def
+++ b/gcc/brig-builtins.def
@@ -45,25 +45,25 @@ DEF_HSAIL_BUILTIN (BUILT_IN_HSAIL_GRIDSIZE, BRIG_OPCODE_GRIDSIZE,
 
 DEF_HSAIL_BUILTIN (BUILT_IN_HSAIL_WORKITEMFLATABSID_U32,
 		  BRIG_OPCODE_WORKITEMFLATABSID, BRIG_TYPE_U32,
-		  "__hsail_workitemflatabsid_u32", BT_FN_UINT_PTR,
-		  ATTR_NOTHROW_LEAF_LIST)
+		  "__hsail_workitemflatabsid_u32", BT_FN_UINT_CONST_PTR,
+		  ATTR_PURE_NOTHROW_LEAF_LIST)
 
 DEF_HSAIL_BUILTIN (BUILT_IN_HSAIL_WORKITEMFLATABSID_U64,
 		  BRIG_OPCODE_WORKITEMFLATABSID, BRIG_TYPE_U64,
-		  "__hsail_workitemflatabsid_u64", BT_FN_ULONG_PTR,
-		  ATTR_NOTHROW_LEAF_LIST)
+		  "__hsail_workitemflatabsid_u64", BT_FN_ULONG_CONST_PTR,
+		  ATTR_PURE_NOTHROW_LEAF_LIST)
 
 DEF_HSAIL_BUILTIN (BUILT_IN_HSAIL_WORKITEMFLATID, BRIG_OPCODE_WORKITEMFLATID,
-		  BRIG_TYPE_U32, "__hsail_workitemflatid", BT_FN_UINT_PTR,
-		  ATTR_NOTHROW_LEAF_LIST)
+		  BRIG_TYPE_U32, "__hsail_workitemflatid", BT_FN_UINT_CONST_PTR,
+		  ATTR_PURE_NOTHROW_LEAF_LIST)
 
 DEF_HSAIL_BUILTIN (BUILT_IN_HSAIL_WORKITEMID, BRIG_OPCODE_WORKITEMID,
-		  BRIG_TYPE_U32, "__hsail_workitemid", BT_FN_UINT_UINT_PTR,
-		  ATTR_NOTHROW_LEAF_LIST)
+		  BRIG_TYPE_U32, "__hsail_workitemid",
+		  BT_FN_UINT_UINT_CONST_PTR, ATTR_PURE_NOTHROW_LEAF_LIST)
 
 DEF_HSAIL_BUILTIN (BUILT_IN_HSAIL_WORKGROUPID, BRIG_OPCODE_WORKGROUPID,
-		  BRIG_TYPE_U32, "__hsail_workgroupid", BT_FN_UINT_UINT_PTR,
-		  ATTR_PURE_NOTHROW_LEAF_LIST)
+		  BRIG_TYPE_U32, "__hsail_workgroupid",
+		  BT_FN_UINT_UINT_CONST_PTR, ATTR_PURE_NOTHROW_LEAF_LIST)
 
 DEF_HSAIL_BUILTIN (BUILT_IN_HSAIL_CURRENTWORKITEMFLATID,
 		  BRIG_OPCODE_CURRENTWORKITEMFLATID,
@@ -90,11 +90,12 @@ DEF_HSAIL_BUILTIN (BUILT_IN_HSAIL_PACKETCOMPLETIONSIG_SIG32,
 
 DEF_HSAIL_BUILTIN (BUILT_IN_HSAIL_CURRENTWORKGROUPSIZE,
 		  BRIG_OPCODE_CURRENTWORKGROUPSIZE, BRIG_TYPE_U32,
-		  "__hsail_currentworkgroupsize", BT_FN_UINT_UINT_PTR,
+		  "__hsail_currentworkgroupsize", BT_FN_UINT_UINT_CONST_PTR,
 		  ATTR_PURE_NOTHROW_LEAF_LIST)
 
 DEF_HSAIL_BUILTIN (BUILT_IN_HSAIL_WORKGROUPSIZE, BRIG_OPCODE_WORKGROUPSIZE,
-		  BRIG_TYPE_U32, "__hsail_workgroupsize", BT_FN_UINT_UINT_PTR,
+		  BRIG_TYPE_U32, "__hsail_workgroupsize",
+		  BT_FN_UINT_UINT_CONST_PTR,
 		  ATTR_PURE_NOTHROW_LEAF_LIST)
 
 DEF_HSAIL_BUILTIN (BUILT_IN_HSAIL_DIM, BRIG_OPCODE_DIM,
@@ -565,7 +566,7 @@ DEF_HSAIL_INTR_BUILTIN (BUILT_IN_HSAIL_SETWORKITEMID, "__hsail_setworkitemid",
 
 DEF_HSAIL_INTR_BUILTIN (BUILT_IN_HSAIL_LAUNCH_WG_FUNC,
 		       "__hsail_launch_wg_function",
-		       BT_FN_VOID_PTR_PTR_PTR, ATTR_NOTHROW_LEAF_LIST)
+		       BT_FN_VOID_PTR_PTR_UINT32, ATTR_NOTHROW_LEAF_LIST)
 
 DEF_HSAIL_INTR_BUILTIN (BUILT_IN_HSAIL_LAUNCH_KERNEL,
 		       "__hsail_launch_kernel",