[PATCH] debug: Fix another vector DECL_MODE ICE [PR98100]

[Jakub Jelinek]

Hi!

The PR88587 fix changes DECL_MODE of vars with vector type during inlining/cloning
when the vars are copied, so that their DECL_MODE matches their TYPE_MODE in
the new function.  Unfortunately, the following testcase still ICEs, the var
isn't really used in the new function and so it isn't copied, but becomes
just a nonlocalized var.  So we can't adjust its DECL_MODE because it
appears in multiple functions and needs different modes in between them.
The following patch changes the DEBUG_INSN creation to use TYPE_MODE instead
of DECL_MODE for vars with vector types.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2020-12-03  Jakub Jelinek  <jakub@redhat.com>

	PR target/98100
	* cfgexpand.c (expand_gimple_basic_block): For vars with
	vector type, use TYPE_MODE rather than DECL_MODE.

	* gcc.target/i386/pr98100.c: New test.

--- gcc/cfgexpand.c.jj	2020-11-26 01:14:47.443082924 +0100
+++ gcc/cfgexpand.c	2020-12-03 14:25:07.772537435 +0100
@@ -5919,7 +5919,7 @@ expand_gimple_basic_block (basic_block b
 			  && !target_for_debug_bind (var))
 			goto delink_debug_stmt;
 
-		      if (DECL_P (var))
+		      if (DECL_P (var) && !VECTOR_TYPE_P (TREE_TYPE (var)))
 			mode = DECL_MODE (var);
 		      else
 			mode = TYPE_MODE (TREE_TYPE (var));
@@ -5936,7 +5936,10 @@ expand_gimple_basic_block (basic_block b
 
 		      value = gimple_debug_source_bind_get_value (stmt);
 
-		      mode = DECL_MODE (var);
+		      if (!VECTOR_TYPE_P (TREE_TYPE (var)))
+			mode = DECL_MODE (var);
+		      else
+			mode = TYPE_MODE (TREE_TYPE (var));
 
 		      val = gen_rtx_VAR_LOCATION (mode, var, (rtx)value,
 						  VAR_INIT_STATUS_UNINITIALIZED);
--- gcc/testsuite/gcc.target/i386/pr98100.c.jj	2020-12-03 14:31:46.795106677 +0100
+++ gcc/testsuite/gcc.target/i386/pr98100.c	2020-12-03 14:31:16.862439052 +0100
@@ -0,0 +1,9 @@
+/* PR target/98100 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -mno-avx -fvar-tracking-assignments -g0" } */
+
+__attribute__((target_clones("default","avx2"))) void
+foo ()
+{
+  __attribute__((__vector_size__(8 * sizeof(int)))) int b = {};
+}

	Jakub