[gcc/devel/c++-modules] x86: Reject target("no-general-regs-only")

[gcc/devel/c++-modules] x86: Reject target("no-general-regs-only")

[Nathan Sidwell]

https://gcc.gnu.org/g:8f1ea8ddccc34c28f72910d9f61bacd35cc73270

commit 8f1ea8ddccc34c28f72910d9f61bacd35cc73270
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Wed Aug 26 12:37:05 2020 -0700

    x86: Reject target("no-general-regs-only")
    
    Reject target("no-general-regs-only") pragma and attribute.
    
    gcc/
    
            PR target/96802
            * config/i386/i386-options.c (ix86_valid_target_attribute_inner_p):
            Reject target("no-general-regs-only").
    
    gcc/testsuite/
    
            PR target/96802
            * gcc.target/i386/pr96802-1.c: New test.
            * gcc.target/i386/pr96802-2.c: Likewise.

Diff:
---
 gcc/config/i386/i386-options.c            |  7 +++++++
 gcc/testsuite/gcc.target/i386/pr96802-1.c | 12 ++++++++++++
 gcc/testsuite/gcc.target/i386/pr96802-2.c | 16 ++++++++++++++++
 3 files changed, 35 insertions(+)

diff --git a/gcc/config/i386/i386-options.c b/gcc/config/i386/i386-options.c
index e0fc68c27bf..b93c338346f 100644
--- a/gcc/config/i386/i386-options.c
+++ b/gcc/config/i386/i386-options.c
@@ -1189,6 +1189,13 @@ ix86_valid_target_attribute_inner_p (tree fndecl, tree args, char *p_strings[],
 	{
 	  if (mask == OPTION_MASK_GENERAL_REGS_ONLY)
 	    {
+	      if (!opt_set_p)
+		{
+		  error_at (loc, "pragma or attribute %<target(\"%s\")%>  "
+			    "does not allow a negated form", p);
+		  return false;
+		}
+
 	      if (type != ix86_opt_ix86_yes)
 		gcc_unreachable ();
 
diff --git a/gcc/testsuite/gcc.target/i386/pr96802-1.c b/gcc/testsuite/gcc.target/i386/pr96802-1.c
new file mode 100644
index 00000000000..e6ceb95d238
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr96802-1.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+
+/* Reject the negated form of non-negatable attributes.  */
+
+__attribute__ ((target ("no-general-regs-only")))
+int
+foo (int a)
+{
+  return a + 1;
+}
+
+/* { dg-error "does not allow a negated form" "" { target *-*-* } 0 } */
diff --git a/gcc/testsuite/gcc.target/i386/pr96802-2.c b/gcc/testsuite/gcc.target/i386/pr96802-2.c
new file mode 100644
index 00000000000..515f5673777
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr96802-2.c
@@ -0,0 +1,16 @@
+/* { dg-do compile } */
+
+/* Reject the negated form of non-negatable pragma target.  */
+
+#pragma GCC push_options
+#pragma GCC target("no-general-regs-only")
+
+int
+foo (int a)
+{
+  return a + 1;
+}
+
+#pragma GCC pop_options
+
+/* { dg-error "does not allow a negated form" "" { target *-*-* } 0 } */