[Bug testsuite/26950] FAIL: gdb.arch/amd64-disp-step-avx.exp: vex2: continue to test_rip_vex2_end

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26950

--- Comment #1 from Tom de Vries <vries at gcc dot gnu.org> ---
Tentative patch, borrows code from i386-avx.c:
...
diff --git a/gdb/testsuite/gdb.arch/amd64-disp-step-avx.exp
b/gdb/testsuite/gdb.arch/amd64-disp-step-avx.exp
index 5dd827a..f720ceb 100644
--- a/gdb/testsuite/gdb.arch/amd64-disp-step-avx.exp
+++ b/gdb/testsuite/gdb.arch/amd64-disp-step-avx.exp
@@ -23,6 +23,11 @@ if { ![istarget x86_64-*-* ] || ![is_lp64_target] } {
     return
 }

+if { ![have_avx] } {
+    verbose "Skipping x86_64 displaced stepping tests."
+    return
+}
+
 standard_testfile .S

 set options [list debug \
diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index f2954fd..70f2a92 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -3117,6 +3117,47 @@ gdb_caching_proc skip_tsx_tests {
     return $skip_tsx_tests
 }

+gdb_caching_proc have_avx {
+    global srcdir subdir gdb_prompt inferior_exited_re
+
+    set me "have_avx"
+    if { ![istarget "i?86-*-*"] && ![istarget "x86_64-*-*"] } {
+        verbose "$me: target does not support avx, returning 1" 2
+        return 0
+    }
+
+    # Compile a test program.
+    set src {
+       #include "nat/x86-cpuid.h"
+
+        int main() {
+           unsigned int eax, ebx, ecx, edx;
+
+           if (!x86_cpuid (1, &eax, &ebx, &ecx, &edx))
+               return 0;
+
+           if ((ecx & (bit_AVX | bit_OSXSAVE)) == (bit_AVX | bit_OSXSAVE))
+               return 1;
+           else
+               return 0;
+        }
+    }
+    set compile_flags "incdir=${srcdir}/.."
+    if {![gdb_simple_compile $me $src executable $compile_flags]} {
+        return 0
+    }
+
+    set code [catch {exec "$obj"} results options]
+    puts "results: $results"
+    puts "code: $code"
+
+    remote_file build delete $obj
+
+    verbose "$me:  returning $code" 2
+    return $code
+}
+
+
 # Run a test on the target to see if it supports avx512bf16.  Return 0 if so,
 # 1 if it does not.  Based on 'check_vmx_hw_available' from the GCC testsuite.

...

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