diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index bff8b08..79f0226 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -5802,7 +5802,15 @@ expand_compound_operation (x) == 0))) { rtx temp = gen_rtx_ZERO_EXTEND (GET_MODE (x), XEXP (x, 0)); - return expand_compound_operation (temp); + rtx temp2 = expand_compound_operation (temp); + + /* Make sure this is a profitable operation. */ + if (rtx_cost (x, SET) > rtx_cost (temp2, SET)) + return temp2; + else if (rtx_cost (x, SET) > rtx_cost (temp, SET)) + return temp; + else + return x; } /* We can optimize some special cases of ZERO_EXTEND. */ |