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(simplify_binary_operation, case MULT): Don't convert to ASHIFT if 

still generating RTL.

From-SVN: r6340
This commit is contained in:
Richard Kenner 1993-12-29 06:51:45 -05:00
parent bb7c21a564
commit c407b802da
1 changed files with 6 additions and 2 deletions
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8
gcc/cse.c
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@ -648,6 +648,8 @@ static void cse_check_loop_start PROTO((rtx, rtx));
static void cse_set_around_loop PROTO((rtx, rtx, rtx));
static rtx cse_basic_block PROTO((rtx, rtx, struct branch_path *, int));
static void count_reg_usage PROTO((rtx, int *, rtx, int));
extern int rtx_equal_function_value_matters;
/* Return an estimate of the cost of computing rtx X.
One use is in cse, to decide which expression to keep in the hash table.
@ -3685,9 +3687,11 @@ simplify_binary_operation (code, mode, op0, op1)
if (op1 == CONST1_RTX (mode))
return op0;
/* Convert multiply by constant power of two into shift. */
/* Convert multiply by constant power of two into shift unless
we are still generating RTL. This test is a kludge. */
if (GET_CODE (op1) == CONST_INT
&& (val = exact_log2 (INTVAL (op1))) >= 0)
&& (val = exact_log2 (INTVAL (op1))) >= 0
&& ! rtx_equal_function_value_matters)
return gen_rtx (ASHIFT, mode, op0, GEN_INT (val));
if (GET_CODE (op1) == CONST_DOUBLE