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[PATCH 1/3] optabs.c: Make vector_compare_rtx cope with VOIDmode constants (e.g. const0_rtx)
- From: Alan Lawrence <alan dot lawrence at arm dot com>
- To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 17 Apr 2015 16:39:49 +0100
- Subject: [PATCH 1/3] optabs.c: Make vector_compare_rtx cope with VOIDmode constants (e.g. const0_rtx)
- Authentication-results: sourceware.org; auth=none
As per introduction, this allows vector_compare_rtx to work on DImode vectors.
Bootstrapped + check-gcc on x86-unknown-linux-gnu.
gcc/ChangeLog:
* optabs.c (vector_compare_rtx): Handle RTL operands having VOIDmode.
diff --git a/gcc/optabs.c b/gcc/optabs.c
index f8d584eeeb11a2c19d8c8d887a0ff18aed5f56b4..135c88938f8bc03eed4dc7f1b5adcb0bb0606b1e 100644
--- a/gcc/optabs.c
+++ b/gcc/optabs.c
@@ -6530,18 +6530,28 @@ vector_compare_rtx (enum tree_code tcode, tree t_op0, tree t_op1,
{
struct expand_operand ops[2];
rtx rtx_op0, rtx_op1;
+ machine_mode m0, m1;
enum rtx_code rcode = get_rtx_code (tcode, unsignedp);
gcc_assert (TREE_CODE_CLASS (tcode) == tcc_comparison);
- /* Expand operands. */
+ /* Expand operands. For vector types with scalar modes, e.g. where int64x1_t
+ has mode DImode, this can produce a constant RTX of mode VOIDmode; in such
+ cases, use the original mode. */
rtx_op0 = expand_expr (t_op0, NULL_RTX, TYPE_MODE (TREE_TYPE (t_op0)),
EXPAND_STACK_PARM);
+ m0 = GET_MODE (rtx_op0);
+ if (m0 == VOIDmode)
+ m0 = TYPE_MODE (TREE_TYPE (t_op0));
+
rtx_op1 = expand_expr (t_op1, NULL_RTX, TYPE_MODE (TREE_TYPE (t_op1)),
EXPAND_STACK_PARM);
+ m1 = GET_MODE (rtx_op1);
+ if (m1 == VOIDmode)
+ m1 = TYPE_MODE (TREE_TYPE (t_op1));
- create_input_operand (&ops[0], rtx_op0, GET_MODE (rtx_op0));
- create_input_operand (&ops[1], rtx_op1, GET_MODE (rtx_op1));
+ create_input_operand (&ops[0], rtx_op0, m0);
+ create_input_operand (&ops[1], rtx_op1, m1);
if (!maybe_legitimize_operands (icode, 4, 2, ops))
gcc_unreachable ();
return gen_rtx_fmt_ee (rcode, VOIDmode, ops[0].value, ops[1].value);