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[AArch64] Restore gimple_folding of reduction intrinsics 

* config/aarch64/aarch64.c (TARGET_GIMPLE_FOLD_BUILTIN): Define again.
	* config/aarch64/aarch64-builtins.c (aarch64_gimple_fold_builtin):
	Restore, enable for bigendian, update to use __builtin..._scal...

From-SVN: r216742
This commit is contained in:
Alan Lawrence 2014-10-27 15:53:25 +00:00 committed by Alan Lawrence
parent 64b0f92844
commit fc72cba7ce
3 changed files with 17 additions and 23 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2014-10-27 Alan Lawrence <alan.lawrence@arm.com>
* config/aarch64/aarch64.c (TARGET_GIMPLE_FOLD_BUILTIN): Define again.
* config/aarch64/aarch64-builtins.c (aarch64_gimple_fold_builtin):
Restore, enable for bigendian, update to use __builtin..._scal...
2014-10-27 Alan Lawrence <alan.lawrence@arm.com>
* config/aarch64/aarch64-simd-builtins.def (reduc_smax_, reduc_smin_,

30
gcc/config/aarch64/aarch64-builtins.c
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@ -1207,9 +1207,6 @@ aarch64_fold_builtin (tree fndecl, int n_args ATTRIBUTE_UNUSED, tree *args,
return NULL_TREE;
}
/* Handling of reduction operations temporarily removed so as to decouple
changes to tree codes from AArch64 NEON Intrinsics. */
#if 0
bool
aarch64_gimple_fold_builtin (gimple_stmt_iterator *gsi)
{
@ -1219,19 +1216,6 @@ aarch64_gimple_fold_builtin (gimple_stmt_iterator *gsi)
tree fndecl;
gimple new_stmt = NULL;
/* The operations folded below are reduction operations. These are
defined to leave their result in the 0'th element (from the perspective
of GCC). The architectural instruction we are folding will leave the
result in the 0'th element (from the perspective of the architecture).
For big-endian systems, these perspectives are not aligned.
It is therefore wrong to perform this fold on big-endian. There
are some tricks we could play with shuffling, but the mid-end is
inconsistent in the way it treats reduction operations, so we will
end up in difficulty. Until we fix the ambiguity - just bail out. */
if (BYTES_BIG_ENDIAN)
return false;
if (call)
{
fndecl = gimple_call_fndecl (stmt);
@ -1243,23 +1227,28 @@ aarch64_gimple_fold_builtin (gimple_stmt_iterator *gsi)
? gimple_call_arg_ptr (stmt, 0)
: &error_mark_node);
/* We use gimple's REDUC_(PLUS|MIN|MAX)_EXPRs for float, signed int
and unsigned int; it will distinguish according to the types of
the arguments to the __builtin. */
switch (fcode)
{
BUILTIN_VALL (UNOP, reduc_splus_, 10)
new_stmt = gimple_build_assign_with_ops (
BUILTIN_VALL (UNOP, reduc_plus_scal_, 10)
new_stmt = gimple_build_assign_with_ops (
REDUC_PLUS_EXPR,
gimple_call_lhs (stmt),
args[0],
NULL_TREE);
break;
BUILTIN_VDQIF (UNOP, reduc_smax_, 10)
BUILTIN_VDQIF (UNOP, reduc_smax_scal_, 10)
BUILTIN_VDQ_BHSI (UNOPU, reduc_umax_scal_, 10)
new_stmt = gimple_build_assign_with_ops (
REDUC_MAX_EXPR,
gimple_call_lhs (stmt),
args[0],
NULL_TREE);
break;
BUILTIN_VDQIF (UNOP, reduc_smin_, 10)
BUILTIN_VDQIF (UNOP, reduc_smin_scal_, 10)
BUILTIN_VDQ_BHSI (UNOPU, reduc_umin_scal_, 10)
new_stmt = gimple_build_assign_with_ops (
REDUC_MIN_EXPR,
gimple_call_lhs (stmt),
@ -1281,7 +1270,6 @@ aarch64_gimple_fold_builtin (gimple_stmt_iterator *gsi)
return changed;
}
#endif
void
aarch64_atomic_assign_expand_fenv (tree *hold, tree *clear, tree *update)

4
gcc/config/aarch64/aarch64.c
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@ -10096,8 +10096,8 @@ aarch64_asan_shadow_offset (void)
#undef TARGET_FRAME_POINTER_REQUIRED
#define TARGET_FRAME_POINTER_REQUIRED aarch64_frame_pointer_required
//#undef TARGET_GIMPLE_FOLD_BUILTIN
//#define TARGET_GIMPLE_FOLD_BUILTIN aarch64_gimple_fold_builtin
#undef TARGET_GIMPLE_FOLD_BUILTIN
#define TARGET_GIMPLE_FOLD_BUILTIN aarch64_gimple_fold_builtin
#undef TARGET_GIMPLIFY_VA_ARG_EXPR
#define TARGET_GIMPLIFY_VA_ARG_EXPR aarch64_gimplify_va_arg_expr