[lld] r323014 - Avoid divisions.

[Rui Ueyama via llvm-commits]

Author: ruiu
Date: Fri Jan 19 16:14:16 2018
New Revision: 323014

URL: http://llvm.org/viewvc/llvm-project?rev=323014&view=rev
Log:
Avoid divisions.

Compiler doesn't know the fact that Config->WordSize * 8 is always a
power of two, so it had to use the div instruction to divide some
number with C.

Modified:
    lld/trunk/ELF/SyntheticSections.cpp

Modified: lld/trunk/ELF/SyntheticSections.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/SyntheticSections.cpp?rev=323014&r1=323013&r2=323014&view=diff
==============================================================================
--- lld/trunk/ELF/SyntheticSections.cpp (original)
+++ lld/trunk/ELF/SyntheticSections.cpp Fri Jan 19 16:14:16 2018
@@ -1743,7 +1743,7 @@ void GnuHashTableSection::writeTo(uint8_
 // [1] Ulrich Drepper (2011), "How To Write Shared Libraries" (Ver. 4.1.2),
 //     p.9, https://www.akkadia.org/drepper/dsohowto.pdf
 void GnuHashTableSection::writeBloomFilter(uint8_t *Buf) {
-  const unsigned C = Config->Wordsize * 8;
+  unsigned C = Config->Is64 ? 64 : 32;
   for (const Entry &Sym : Symbols) {
     size_t I = (Sym.Hash / C) & (MaskWords - 1);
     uint64_t Val = readUint(Buf + I * Config->Wordsize);