Changeset 57312 in vbox for trunk/include

Timestamp:

Aug 13, 2015 10:00:17 AM (10 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

102074

Message:

ASMChangeFlags,ASMAddFlags,ASMClearFlags: GCC inline assembly constraints fixes and optimizations. ('&' is for indicating that output register is not suitable for input as it's clobbered early. 'n' is indicating constant.)

File:

• trunk/include/iprt/asm-amd64-x86.h (modified) (6 diffs)

trunk/include/iprt/asm-amd64-x86.h

@@ -617 +617 @@
                          "mov   %1, (%%rsp)\n\t"
                          "popfq\n\t"
-                         : "=r" (fOldEfl),
+                         : "=&r" (fOldEfl),
                            "=r" (fAndEfl)
                          : "1" (fAndEfl),
-                           "r" (fOrEfl) );
+                           "rn" (fOrEfl) );
 #  else
     __asm__ __volatile__("pushfl\n\t"
@@ -627 +627 @@
                          "orl   %2, (%%esp)\n\t"
                          "popfl\n\t"
-                         : "=r" (fOldEfl)
-                         : "r" (fAndEfl),
-                           "r" (fOrEfl) );
+                         : "=&r" (fOldEfl)
+                         : "rn" (fAndEfl),
+                           "rn" (fOrEfl) );
 #  endif
 # elif RT_INLINE_ASM_USES_INTRIN >= 15
@@ -682 +682 @@
                          "orq   %1, (%%rsp)\n\t"
                          "popfq\n\t"
-                         : "=r" (fOldEfl)
-                         : "r" (fOrEfl) );
+                         : "=&r" (fOldEfl)
+                         : "rn" (fOrEfl) );
 #  else
     __asm__ __volatile__("pushfl\n\t"
@@ -689 +689 @@
                          "orl   %1, (%%esp)\n\t"
                          "popfl\n\t"
-                         : "=r" (fOldEfl)
-                         : "r" (fOrEfl) );
+                         : "=&r" (fOldEfl)
+                         : "rn" (fOrEfl) );
 #  endif
 # elif RT_INLINE_ASM_USES_INTRIN >= 15
@@ -737 +737 @@
                          "andq  %1, (%%rsp)\n\t"
                          "popfq\n\t"
-                         : "=r" (fOldEfl)
-                         : "r" (fAndEfl) );
+                         : "=&r" (fOldEfl)
+                         : "rn" (fAndEfl) );
 #  else
     __asm__ __volatile__("pushfl\n\t"
@@ -744 +744 @@
                          "andl  %1, (%%esp)\n\t"
                          "popfl\n\t"
-                         : "=r" (fOldEfl)
-                         : "r" (fAndEfl) );
+                         : "=&r" (fOldEfl)
+                         : "rn" (fAndEfl) );
 #  endif
 # elif RT_INLINE_ASM_USES_INTRIN >= 15