From: Martin Jambor <mjambor@suse.cz>
Date: Thu, 18 Jan 2024 13:24:15 +0000 (+0100)
Subject: sra: Disqualify bases of operands of asm gotos
X-Git-Tag: basepoints/gcc-15~1909
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=6764043e88a4208f7c69bf0ccd19ddc7a6016fb1;p=thirdparty%2Fgcc.git

sra: Disqualify bases of operands of asm gotos

PR 110422 shows that SRA can ICE assuming there is a single edge
outgoing from a block terminated with an asm goto.  We need that for
BB-terminating statements so that any adjustments they make to the
aggregates can be copied over to their replacements.  Because we can't
have that after ASM gotos, we need to punt.

gcc/ChangeLog:

2024-01-17  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/110422
	* tree-sra.cc (scan_function): Disqualify bases of operands of asm
	gotos.

gcc/testsuite/ChangeLog:

2024-01-17  Martin Jambor  <mjambor@suse.cz>

	PR tree-optimization/110422
	* gcc.dg/torture/pr110422.c: New test.
---

diff --git a/gcc/testsuite/gcc.dg/torture/pr110422.c b/gcc/testsuite/gcc.dg/torture/pr110422.c
new file mode 100644
index 000000000000..2e171a7a19e5
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr110422.c
@@ -0,0 +1,10 @@
+/* { dg-do compile } */
+
+struct T { int x; };
+int foo(void) {
+  struct T v;
+  asm goto("" : "+r"(v.x) : : : lab);
+  return 0;
+lab:
+  return -5;
+}
diff --git a/gcc/tree-sra.cc b/gcc/tree-sra.cc
index 6a1141b73770..f8e71ec48b93 100644
--- a/gcc/tree-sra.cc
+++ b/gcc/tree-sra.cc
@@ -1559,15 +1559,32 @@ scan_function (void)
 	    case GIMPLE_ASM:
 	      {
 		gasm *asm_stmt = as_a <gasm *> (stmt);
-		for (i = 0; i < gimple_asm_ninputs (asm_stmt); i++)
+		if (stmt_ends_bb_p (asm_stmt)
+		    && !single_succ_p (gimple_bb (asm_stmt)))
 		  {
-		    t = TREE_VALUE (gimple_asm_input_op (asm_stmt, i));
-		    ret |= build_access_from_expr (t, asm_stmt, false);
+		    for (i = 0; i < gimple_asm_ninputs (asm_stmt); i++)
+		      {
+			t = TREE_VALUE (gimple_asm_input_op (asm_stmt, i));
+			disqualify_base_of_expr (t, "OP of asm goto.");
+		      }
+		    for (i = 0; i < gimple_asm_noutputs (asm_stmt); i++)
+		      {
+			t = TREE_VALUE (gimple_asm_output_op (asm_stmt, i));
+			disqualify_base_of_expr (t, "OP of asm goto.");
+		      }
 		  }
-		for (i = 0; i < gimple_asm_noutputs (asm_stmt); i++)
+		else
 		  {
-		    t = TREE_VALUE (gimple_asm_output_op (asm_stmt, i));
-		    ret |= build_access_from_expr (t, asm_stmt, true);
+		    for (i = 0; i < gimple_asm_ninputs (asm_stmt); i++)
+		      {
+			t = TREE_VALUE (gimple_asm_input_op (asm_stmt, i));
+			ret |= build_access_from_expr (t, asm_stmt, false);
+		      }
+		    for (i = 0; i < gimple_asm_noutputs (asm_stmt); i++)
+		      {
+			t = TREE_VALUE (gimple_asm_output_op (asm_stmt, i));
+			ret |= build_access_from_expr (t, asm_stmt, true);
+		      }
 		  }
 	      }
 	      break;