[compiler-rt] r257225 - [PGO] Introducing version mask macro/NFC (sync)

[Xinliang David Li via llvm-commits]

Author: davidxl
Date: Fri Jan  8 16:55:54 2016
New Revision: 257225

URL: http://llvm.org/viewvc/llvm-project?rev=257225&view=rev
Log:
[PGO] Introducing version mask macro/NFC (sync)

Modified:
    compiler-rt/trunk/lib/profile/InstrProfData.inc

Modified: compiler-rt/trunk/lib/profile/InstrProfData.inc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/profile/InstrProfData.inc?rev=257225&r1=257224&r2=257225&view=diff
==============================================================================
--- compiler-rt/trunk/lib/profile/InstrProfData.inc (original)
+++ compiler-rt/trunk/lib/profile/InstrProfData.inc Fri Jan  8 16:55:54 2016
@@ -700,6 +700,14 @@ serializeValueProfDataFromRT(const Value
 #define INSTR_PROF_INDEX_VERSION 3
 #define INSTR_PROF_COVMAP_VERSION 0
 
+/* Profile version is always of type uint_64_t. Reserve the upper 8 bits in the
+ * version for other variants of profile. We set the lowest bit of the upper 8
+ * bits (i.e. bit 56) to 1 to indicate if this is an IR-level instrumentaiton
+ * generated profile, and 0 if this is a Clang FE generated profile.
+*/
+#define VARIANT_MASKS_ALL 0xff00000000000000ULL
+#define GET_VERSION(V) ((V) & ~VARIANT_MASKS_ALL)
+
 /* Runtime section names and name strings.  */
 #define INSTR_PROF_DATA_SECT_NAME __llvm_prf_data
 #define INSTR_PROF_NAME_SECT_NAME __llvm_prf_names