i386: Do not check vector size conflict when AVX512 is not explicitly set [PR 118815]

When AVX512 is not explicitly set, we should not take EVEX512 bit into
consideration when checking vector size. It will solve the intrin header
file reporting warnings when compiling with -Wsystem-headers.

However, there is side effect on the usage for '-march=xxx -mavx10.1-256',
where xxx is with AVX512. It will not report warning on vector size for now.
Since it is a rare usage, we will take it.

gcc/ChangeLog:

	PR target/118815
	* config/i386/i386-options.cc (ix86_option_override_internal):
	Do not check vector size conflict when AVX512 is not explicitly
	set.

gcc/testsuite/ChangeLog:

	PR target/118815
	* gcc.target/i386/pr118815.c: New test.

diff --git a/gcc/config/i386/i386-options.cc b/gcc/config/i386/i386-options.cc
index 3467ab0bbebc52f7b6c89517640de13375468807..7e85334d3d366fd28f5ccf5cb2116f752c8b8b20 100644 (file)
--- a/gcc/config/i386/i386-options.cc
+++ b/gcc/config/i386/i386-options.cc
@@ -2711,6 +2711,7 @@ ix86_option_override_internal (bool main_args_p,
                        "using 512 as max vector size");
        }
       else if (TARGET_AVX512F_P (opts->x_ix86_isa_flags)
+              && (opts->x_ix86_isa_flags_explicit & OPTION_MASK_ISA_AVX512F)
               && !(OPTION_MASK_ISA2_EVEX512
                    & opts->x_ix86_isa_flags2_explicit))
        warning (0, "Vector size conflicts between AVX10.1 and AVX512, using "

diff --git a/gcc/testsuite/gcc.target/i386/pr118815.c b/gcc/testsuite/gcc.target/i386/pr118815.c
new file mode 100644 (file)
index 0000000..84308fc
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr118815.c
@@ -0,0 +1,9 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -march=x86-64-v3" } */
+
+#pragma GCC push_options
+#pragma GCC target("avx10.2-256")
+
+void foo();
+
+#pragma GCC pop_options