[git] GCRYPT - branch, LIBGCRYPT-1.8-BRANCH, updated. libgcrypt-1.8.2-11-g22db623

[by Jussi Kivilinna]

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- Log -----------------------------------------------------------------
commit 22db6237de00cafb85c0112073b55d0d750e6b03
Author: Jussi Kivilinna <jussi.kivilinna at iki.fi>
Date:   Sat Jan 6 20:26:52 2018 +0200

    Make BMI2 inline assembly check more robust
    
    * configure.ac (gcry_cv_gcc_inline_asm_bmi2): New assembly test.
    --
    
    Use actual assembly snippets from keccak.c to check that compiler
    has proper support for used BMI2 instructions.
    
    GnuPG-bug-id: 3408
    Signed-off-by: Jussi Kivilinna <jussi.kivilinna at iki.fi>
    (cherry picked from commit 135250e3060e79be698d4f36a819aa8a880789f8)

diff --git a/configure.ac b/configure.ac
index f20aa4f..5396725 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1402,8 +1402,15 @@ AC_CACHE_CHECK([whether GCC inline assembler supports BMI2 instructions],
         else
           gcry_cv_gcc_inline_asm_bmi2=no
           AC_COMPILE_IFELSE([AC_LANG_SOURCE(
-          [[void a(void) {
-              __asm__("rorxl \$23, %%eax, %%edx\\n\\t":::"memory");
+          [[unsigned int a(unsigned int x, unsigned int y) {
+              unsigned int tmp1, tmp2;
+              asm ("rorxl %2, %1, %0"
+                   : "=r" (tmp1)
+                   : "rm0" (x), "J" (32 - ((23) & 31)));
+              asm ("andnl %2, %1, %0"
+                   : "=r" (tmp2)
+                   : "r0" (x), "rm" (y));
+              return tmp1 + tmp2;
             }]])],
           [gcry_cv_gcc_inline_asm_bmi2=yes])
         fi])

-----------------------------------------------------------------------

Summary of changes:
 configure.ac | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)


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