Added comment clarifying RDTSC.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@2370

diff --git a/coregrind/vg_to_ucode.c b/coregrind/vg_to_ucode.c
index 6e5a4e23630084d9dd146daa6b8281eda1f1ef34..a375c08d0276cafca0d9379af0045706cbe81e9d 100644 (file)
--- a/coregrind/vg_to_ucode.c
+++ b/coregrind/vg_to_ucode.c
@@ -6728,6 +6728,9 @@ static Addr disInstr ( UCodeBlock* cb, Addr eip, Bool* isEnd )
          t2 = newTemp(cb);
          t3 = newTemp(cb);
          uInstr0(cb, CALLM_S, 0);
+         // Nb: even though these args aren't used by RDTSC_helper, need
+         // them to be defined (for Memcheck).  The TempRegs pushed must
+         // also be distinct.
          uInstr2(cb, MOV,   4, Literal, 0, TempReg, t1);
          uLiteral(cb, 0);
          uInstr1(cb, PUSH,  4, TempReg, t1);