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pr103523: Check for PLUS/MINUS support

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Check for PLUS_EXPR/MINUS_EXPR support in vectorizable_induction.
PR103523 is an ICE on valid code:

void d(float *a, float b, int c) {
    float e;
    for (; c; c--, e += b)
      a[c] = e;
}

This is due to not checking for PLUS_EXPR support, which is missing in
VNx2sf mode. This causes an ICE at expand time. This patch adds a check
for support in vectorizable_induction.

gcc/ChangeLog:

	PR tree-optimization/103523
	* tree-vect-loop.c (vectorizable_induction): Check for
	PLUS_EXPR/MINUS_EXPR support.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/pr103523.c: New test.
This commit is contained in:
Joel Hutton 2021-12-10 10:26:42 +00:00
parent db184a3453
commit a5f65cf7ad
2 changed files with 17 additions and 4 deletions
gcc
testsuite/gcc.target/aarch64
pr103523.c
tree-vect-loop.c

8
gcc/testsuite/gcc.target/aarch64/pr103523.c Normal file

@ -0,0 +1,8 @@
/* { dg-do compile } */
/* { dg-options "-march=armv8-a+sve -mtune=neoverse-v1 -Ofast" } */
void d(float *a, float b, int c) {
float e;
for (; c; c--, e += b)
a[c] = e;
}

13
gcc/tree-vect-loop.c

@ -8065,6 +8065,15 @@ vectorizable_induction (loop_vec_info loop_vinfo,
return false;
}
step_expr = STMT_VINFO_LOOP_PHI_EVOLUTION_PART (stmt_info);
gcc_assert (step_expr != NULL_TREE);
tree step_vectype = get_same_sized_vectype (TREE_TYPE (step_expr), vectype);
/* Check for backend support of PLUS/MINUS_EXPR. */
if (!directly_supported_p (PLUS_EXPR, step_vectype)
|| !directly_supported_p (MINUS_EXPR, step_vectype))
return false;
if (!vec_stmt) /* transformation not required. */
{
unsigned inside_cost = 0, prologue_cost = 0;
@ -8124,10 +8133,6 @@ vectorizable_induction (loop_vec_info loop_vinfo,
if (dump_enabled_p ())
dump_printf_loc (MSG_NOTE, vect_location, "transform induction phi.\n");
step_expr = STMT_VINFO_LOOP_PHI_EVOLUTION_PART (stmt_info);
gcc_assert (step_expr != NULL_TREE);
tree step_vectype = get_same_sized_vectype (TREE_TYPE (step_expr), vectype);
pe = loop_preheader_edge (iv_loop);
/* Find the first insertion point in the BB. */
basic_block bb = gimple_bb (phi);