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Avoid casting to char* in prefetch()

Browse source 
Funny enough, gcc __builtin_prefetch() expects
already a void*, instead Windows's _mm_prefetch()
requires a char*.

The patch allows to remove ugly casts from caller
sites.

No functional change.
This commit is contained in:
Marco Costalba 2015-02-07 19:13:41 +01:00
parent 152a4dc5cd
commit 99c9cae586
4 changed files with 9 additions and 9 deletions
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6
src/misc.cpp
View file

@ -176,11 +176,11 @@ void start_logger(bool b) { Logger::start(b); }
/// which can be quite slow.
#ifdef NO_PREFETCH
void prefetch(char*) {}
void prefetch(void*) {}
#else
void prefetch(char* addr) {
void prefetch(void* addr) {
# if defined(__INTEL_COMPILER)
// This hack prevents prefetches from being optimized away by
@ -189,7 +189,7 @@ void prefetch(char* addr) {
# endif
# if defined(__INTEL_COMPILER) || defined(_MSC_VER)
_mm_prefetch(addr, _MM_HINT_T0);
_mm_prefetch((char*)addr, _MM_HINT_T0);
# else
__builtin_prefetch(addr);
# endif

2
src/misc.h
View file

@ -28,7 +28,7 @@
#include "types.h"
const std::string engine_info(bool to_uci = false);
void prefetch(char* addr);
void prefetch(void* addr);
void start_logger(bool b);
void dbg_hit_on(bool b);

6
src/position.cpp
View file

@ -774,7 +774,7 @@ void Position::do_move(Move m, StateInfo& newSt, const CheckInfo& ci, bool moveI
// Update material hash key and prefetch access to materialTable
k ^= Zobrist::psq[them][captured][capsq];
st->materialKey ^= Zobrist::psq[them][captured][pieceCount[them][captured]];
prefetch((char*)thisThread->materialTable[st->materialKey]);
prefetch(thisThread->materialTable[st->materialKey]);
// Update incremental scores
st->psq -= psq[them][captured][capsq];
@ -841,7 +841,7 @@ void Position::do_move(Move m, StateInfo& newSt, const CheckInfo& ci, bool moveI
// Update pawn hash key and prefetch access to pawnsTable
st->pawnKey ^= Zobrist::psq[us][PAWN][from] ^ Zobrist::psq[us][PAWN][to];
prefetch((char*)thisThread->pawnsTable[st->pawnKey]);
prefetch(thisThread->pawnsTable[st->pawnKey]);
// Reset rule 50 draw counter
st->rule50 = 0;
@ -988,7 +988,7 @@ void Position::do_null_move(StateInfo& newSt) {
}
st->key ^= Zobrist::side;
prefetch((char*)TT.first_entry(st->key));
prefetch(TT.first_entry(st->key));
++st->rule50;
st->pliesFromNull = 0;

4
src/search.cpp
View file

@ -872,7 +872,7 @@ moves_loop: // When in check and at SpNode search starts from here
}
// Speculative prefetch as early as possible
prefetch((char*)TT.first_entry(pos.key_after(move)));
prefetch(TT.first_entry(pos.key_after(move)));
// Check for legality just before making the move
if (!RootNode && !SpNode && !pos.legal(move, ci.pinned))
@ -1238,7 +1238,7 @@ moves_loop: // When in check and at SpNode search starts from here
continue;
// Speculative prefetch as early as possible
prefetch((char*)TT.first_entry(pos.key_after(move)));
prefetch(TT.first_entry(pos.key_after(move)));
// Check for legality just before making the move
if (!pos.legal(move, ci.pinned))