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tree-optimization/98221 - fix wrong unpack operation used for big-endian

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The vec-abi-varargs-1.c testcase on IBM Z currently fails.

While adding an SI mode vector to a DI mode vector the first is unpacked using:

  _28 = BIT_INSERT_EXPR <{ 0, 0, 0, 0 }, _2, 0>;
  _34 = [vec_unpack_lo_expr] _28;

However, on big endian targets lo refers to the right hand side of the vector - in this case the zeroes.

2021-01-11  Andreas Krebbel  <krebbel@linux.ibm.com>

	* tree-ssa-forwprop.c (simplify_vector_constructor): For
	big-endian, use UNPACK[_FLOAT]_HI.
This commit is contained in:
Andreas Krebbel 2021-01-11 10:59:43 +01:00 committed by Richard Biener
parent 0c18faac3f
commit 300a3ce5c5
1 changed files with 13 additions and 8 deletions
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21
gcc/tree-ssa-forwprop.c
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@ -2392,6 +2392,17 @@ simplify_vector_constructor (gimple_stmt_iterator *gsi)
some simple special cases via VEC_[UN]PACK[_FLOAT]_LO_EXPR. */
optab optab;
tree halfvectype, dblvectype;
enum tree_code unpack_op;
if (!BYTES_BIG_ENDIAN)
unpack_op = (FLOAT_TYPE_P (TREE_TYPE (type))
? VEC_UNPACK_FLOAT_LO_EXPR
: VEC_UNPACK_LO_EXPR);
else
unpack_op = (FLOAT_TYPE_P (TREE_TYPE (type))
? VEC_UNPACK_FLOAT_HI_EXPR
: VEC_UNPACK_HI_EXPR);
if (CONVERT_EXPR_CODE_P (conv_code)
&& (2 * TYPE_PRECISION (TREE_TYPE (TREE_TYPE (orig[0])))
== TYPE_PRECISION (TREE_TYPE (type)))
@ -2405,9 +2416,7 @@ simplify_vector_constructor (gimple_stmt_iterator *gsi)
represented as scalar bitmasks. See PR95528. */
&& (VECTOR_MODE_P (TYPE_MODE (dblvectype))
|| VECTOR_BOOLEAN_TYPE_P (dblvectype))
&& (optab = optab_for_tree_code (FLOAT_TYPE_P (TREE_TYPE (type))
? VEC_UNPACK_FLOAT_LO_EXPR
: VEC_UNPACK_LO_EXPR,
&& (optab = optab_for_tree_code (unpack_op,
dblvectype,
optab_default))
&& (optab_handler (optab, TYPE_MODE (dblvectype))
@ -2430,11 +2439,7 @@ simplify_vector_constructor (gimple_stmt_iterator *gsi)
orig[0], TYPE_SIZE (dblvectype),
bitsize_zero_node);
gsi_insert_seq_before (gsi, stmts, GSI_SAME_STMT);
gimple_assign_set_rhs_with_ops (gsi,
FLOAT_TYPE_P (TREE_TYPE (type))
? VEC_UNPACK_FLOAT_LO_EXPR
: VEC_UNPACK_LO_EXPR,
dbl);
gimple_assign_set_rhs_with_ops (gsi, unpack_op, dbl);
}
else if (CONVERT_EXPR_CODE_P (conv_code)
&& (TYPE_PRECISION (TREE_TYPE (TREE_TYPE (orig[0])))