032bf6553
Denys Vlasenko
2010-01-18
Subject
diff: defeat gcc's optimization
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editors/diff.c+4 -1
| @@ -435,7 +435,10 @@ static int *create_J(FILE_and_pos_t ft[2], int nlen[2], off_t *ix[2]) | |
| tok = read_token(&ft[i], tok); | |
| if (!(tok & TOK_EMPTY)) { | |
| /* Hash algorithm taken from Robert Sedgewick, Algorithms in C, 3d ed., p 578. */ | |
| - | hash = hash * 128 - hash + TOK2CHAR(tok); |
| + | /*hash = hash * 128 - hash + TOK2CHAR(tok); |
| + | * gcc insists on optimizing above to "hash * 127 + ...", thus... */ |
| + | unsigned o = hash - TOK2CHAR(tok); |
| + | hash = hash * 128 - o; /* we want SPEED here */ |
| continue; | |
| } | |
| if (nlen[i]++ == sz) { | |