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[AArch64_be] Don't fold reduction intrinsics. 

gcc/

	* config/aarch64/aarch64-builtins.c
	(aarch64_gimple_fold_builtin): Don't fold reduction operations for
	BYTES_BIG_ENDIAN.

From-SVN: r213379
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James Greenhalgh 2014-07-31 15:32:44 +00:00 committed by James Greenhalgh
parent 988fa69392
commit 22756ccf24
2 changed files with 20 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2014-07-31 James Greenhalgh <james.greenhalgh@arm.com>
* config/aarch64/aarch64-builtins.c
(aarch64_gimple_fold_builtin): Don't fold reduction operations for
BYTES_BIG_ENDIAN.
2014-07-31 James Greenhalgh <james.greenhalgh@arm.com>
* config/aarch64/aarch64.c (aarch64_simd_vect_par_cnst_half): Vary

14
gcc/config/aarch64/aarch64-builtins.c
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@ -1383,6 +1383,20 @@ aarch64_gimple_fold_builtin (gimple_stmt_iterator *gsi)
tree call = gimple_call_fn (stmt);
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);