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expr: Fix up VEC_PACK_TRUNC_EXPR expansion [PR101046]

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The following testcase ICEs, because we have a mode mismatch.
VEC_PACK_TRUNC_EXPR's operands have different modes from the result
(same vector mode size but twice as large element),
but we were passing non-NULL subtarget with the mode of the result
to the expansion of its arguments, so the VEC_PERM_EXPR in one of the
operands which had V8SImode operands and result had V16HImode target.

Fixed by clearing the subtarget if we are changing mode.

2021-06-15  Jakub Jelinek  <jakub@redhat.com>

	PR target/101046
	* expr.c (expand_expr_real_2) <case VEC_PACK_FIX_TRUNC_EXPR,
	case VEC_PACK_TRUNC_EXPR>: Clear subtarget when changing mode.

(cherry picked from commit 008153c843)
This commit is contained in:
Jakub Jelinek 2021-06-15 11:36:47 +02:00
parent 8cd45af39d
commit 5ece5ac99e
1 changed files with 2 additions and 0 deletions
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gcc/expr.c
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@ -9809,6 +9809,7 @@ expand_expr_real_2 (sepops ops, rtx target, machine_mode tmode,
case VEC_PACK_SAT_EXPR:
case VEC_PACK_FIX_TRUNC_EXPR:
mode = TYPE_MODE (TREE_TYPE (treeop0));
subtarget = NULL_RTX;
goto binop;
case VEC_PACK_TRUNC_EXPR:
@ -9832,6 +9833,7 @@ expand_expr_real_2 (sepops ops, rtx target, machine_mode tmode,
return eops[0].value;
}
mode = TYPE_MODE (TREE_TYPE (treeop0));
subtarget = NULL_RTX;
goto binop;
case VEC_PACK_FLOAT_EXPR: