volume: Add explicit checks for ARMv6 instructions

[pulseaudio] / configure.ac

diff --git a/configure.ac b/configure.ac
index f93d461659f505eca9c6558bd5b1f0adaf105c32..0f6ff815ba3885a2b2f55197dd9e28850d441757 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -227,7 +227,7 @@ else
                     [pulseaudio_cv_support_arm_atomic_ops=no])
                  ])
                AS_IF([test "$pulseaudio_cv_support_arm_atomic_ops" = "yes"], [
-                   AC_DEFINE([ATOMIC_ARM_INLINE_ASM], 1, [Have ARMv6 instructions.])
+                   AC_DEFINE([ATOMIC_ARM_INLINE_ASM], 1, [Have ARM atomic instructions.])
                    need_libatomic_ops=no
                  ])
            fi
@@ -246,6 +246,37 @@ else
     esac
 fi
 
+# If we're on ARM, check for the ARMV6 instructions we need */
+case $host in
+  arm*)
+    AC_CACHE_CHECK([support for required armv6 instructions],
+      pulseaudio_cv_support_armv6,
+      [AC_COMPILE_IFELSE(
+         AC_LANG_PROGRAM([],
+           [[volatile int a = -60000, b = 0xaaaabbbb, c = 0xccccdddd;
+             asm volatile ("ldr r0, %2 \n"
+                           "ldr r2, %3 \n"
+                           "ldr r3, %4 \n"
+                           "ssat r1, #8, r0 \n"
+                           "str r1, %0 \n"
+                           "pkhbt r1, r3, r2, LSL #8 \n"
+                           "str r1, %1 \n"
+                           : "=m" (a), "=m" (b)
+                           : "m" (a), "m" (b), "m" (c)
+                           : "r0", "r1", "r2", "r3", "cc");
+             return (a == -128 && b == 0xaabbdddd) ? 0 : -1;
+           ]]),
+         [pulseaudio_cv_support_armv6=yes],
+         [pulseaudio_cv_support_armv6=no])
+      ])
+    AS_IF([test "$pulseaudio_cv_support_armv6" = "yes"], [
+        AC_DEFINE([HAVE_ARMV6], 1, [Have ARMv6 instructions.])
+      ])
+  ;;
+  *)
+  ;;
+esac
+
 CC_CHECK_TLS
 
 AC_CACHE_CHECK([whether $CC knows _Bool],