[Xen-changelog] [xen master] x86emul: extend MASKMOV{Q,DQU} tests

[patchbot@xxxxxxx]

commit d2581b7b3ddb1861b1c06993503363a5f04cf689
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Sep 4 11:29:22 2018 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Sep 4 11:29:22 2018 +0200

    x86emul: extend MASKMOV{Q,DQU} tests
    
    While deriving the first AVX512 pieces from existing code I've got the
    (in the end wrong) impression that the emulation of these insns would be
    broken. Besides testing that the instructions act as no-ops when the
    controlling mask bits are all zero, add ones to also check that the data
    merging actually works.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 tools/tests/x86_emulator/test_x86_emulator.c | 32 ++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/tools/tests/x86_emulator/test_x86_emulator.c 
b/tools/tests/x86_emulator/test_x86_emulator.c
index ad9a5e72b7..4458a6537b 100644
--- a/tools/tests/x86_emulator/test_x86_emulator.c
+++ b/tools/tests/x86_emulator/test_x86_emulator.c
@@ -2626,7 +2626,7 @@ int main(int argc, char **argv)
         printf("skipped\n");
 #endif
 
-    printf("%-40s", "Testing maskmovq (zero mask)...");
+    printf("%-40s", "Testing maskmovq %mm4,%mm4...");
     if ( stack_exec && cpu_has_sse )
     {
         decl_insn(maskmovq);
@@ -2639,12 +2639,25 @@ int main(int argc, char **argv)
         rc = x86_emulate(&ctxt, &emulops);
         if ( rc != X86EMUL_OKAY || !check_eip(maskmovq) )
             goto fail;
+
+        asm volatile ( "pcmpeqb %mm3, %mm3\n\t"
+                       "punpcklbw %mm3, %mm4\n" );
+        memset(res, 0x55, 24);
+
+        set_insn(maskmovq);
+        regs.edi = (unsigned long)(res + 2);
+        rc = x86_emulate(&ctxt, &emulops);
+        if ( rc != X86EMUL_OKAY || !check_eip(maskmovq) ||
+             memcmp(res, res + 4, 8) ||
+             res[2] != 0xff55ff55 || res[3] != 0xff55ff55 )
+            goto fail;
+
         printf("okay\n");
     }
     else
         printf("skipped\n");
 
-    printf("%-40s", "Testing maskmovdqu (zero mask)...");
+    printf("%-40s", "Testing maskmovdqu %xmm3,%xmm3...");
     if ( stack_exec && cpu_has_sse2 )
     {
         decl_insn(maskmovdqu);
@@ -2653,9 +2666,24 @@ int main(int argc, char **argv)
                        put_insn(maskmovdqu, "maskmovdqu %xmm3, %xmm3") );
 
         set_insn(maskmovdqu);
+        regs.edi = 0;
         rc = x86_emulate(&ctxt, &emulops);
         if ( rc != X86EMUL_OKAY || !check_eip(maskmovdqu) )
             goto fail;
+
+        asm volatile ( "pcmpeqb %xmm4, %xmm4\n\t"
+                       "punpcklbw %xmm4, %xmm3\n" );
+        memset(res, 0x55, 48);
+
+        set_insn(maskmovdqu);
+        regs.edi = (unsigned long)(res + 4);
+        rc = x86_emulate(&ctxt, &emulops);
+        if ( rc != X86EMUL_OKAY || !check_eip(maskmovdqu) ||
+             memcmp(res, res + 8, 16) ||
+             res[4] != 0xff55ff55 || res[5] != 0xff55ff55 ||
+             res[6] != 0xff55ff55 || res[7] != 0xff55ff55 )
+            goto fail;
+
         printf("okay\n");
     }
     else
--
generated by git-patchbot for /home/xen/git/xen.git#master

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