[Qemu-devel] [RISU PATCH v3 09/18] risugen: add --xfeatures option for x86

[Jan Bobek <jan.bobek@gmail.com>]

The --xfeatures option is modelled after identically-named option to
RISU itself; it allows the user to specify which vector registers
should be initialized, so that the test image doesn't try to access
registers which may not be present at runtime. Note that it is still
the user's responsibility to filter out the test instructions using
these registers.

Signed-off-by: Jan Bobek <jan.bobek@gmail.com>
---
 risugen | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/risugen b/risugen
index 50920eb..76424e1 100755
--- a/risugen
+++ b/risugen
@@ -311,6 +311,9 @@ Valid options:
     --sve        : enable sve floating point
     --be         : generate instructions in Big-Endian byte order (ppc64 only).
     --x86_64     : generate 64-bit (rather than 32-bit) code. (x86 only)
+    --xfeatures {none|mmx|sse|avx} : what SIMD registers should be
+                   initialized. The initialization is cumulative,
+                   i.e. AVX includes both MMX and SSE. (x86 only)
     --help       : print this message
 EOT
 }
@@ -324,6 +327,7 @@ sub main()
     my $sve_enabled = 0;
     my $big_endian = 0;
     my $is_x86_64 = 0;
+    my $xfeatures = 'none';
     my ($infile, $outfile);
 
     GetOptions( "help" => sub { usage(); exit(0); },
@@ -342,6 +346,14 @@ sub main()
                 "no-fp" => sub { $fp_enabled = 0; },
                 "sve" => sub { $sve_enabled = 1; },
                 "x86_64" => sub { $is_x86_64 = 1; },
+                "xfeatures=s" => sub {
+                    $xfeatures = $_[1];
+                    die "value for xfeatures must be one of 'none', 'mmx', 'sse', 'avx' (got '$xfeatures')\n"
+                        unless ($xfeatures eq 'none'
+                                || $xfeatures eq 'mmx'
+                                || $xfeatures eq 'sse'
+                                || $xfeatures eq 'avx');
+                },
         ) or return 1;
     # allow "--pattern re,re" and "--pattern re --pattern re"
     @pattern_re = split(/,/,join(',',@pattern_re));
@@ -377,6 +389,7 @@ sub main()
         'subarch' => $full_arch[1] || '',
         'bigendian' => $big_endian,
         'x86_64' => $is_x86_64,
+        'xfeatures' => $xfeatures,
     );
 
     write_test_code(\%params);
-- 
2.20.1