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(simplify_binary_operation... 

(simplify_binary_operation, case MULT): Check for case
where width is larger than HOST_BITS_PER_WIDE_INT, and upper most
bit is set.  We can not generate a simple shift in this case.

From-SVN: r12238
This commit is contained in:
Jim Wilson 1996-06-07 19:36:34 -07:00
parent 44803a5b36
commit 2d91790329
1 changed files with 5 additions and 0 deletions
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5
gcc/cse.c
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@ -3878,6 +3878,11 @@ simplify_binary_operation (code, mode, op0, op1)
we are still generating RTL. This test is a kludge. */
if (GET_CODE (op1) == CONST_INT
&& (val = exact_log2 (INTVAL (op1))) >= 0
/* If the mode is larger than the host word size, and the
uppermost bit is set, then this isn't a power of two due
to implicit sign extension. */
&& (width <= HOST_BITS_PER_WIDE_INT
|| val != HOST_BITS_PER_WIDE_INT - 1)
&& ! rtx_equal_function_value_matters)
return gen_rtx (ASHIFT, mode, op0, GEN_INT (val));