GCC modified for the FreeChainXenon project
3a035f1932
Enhance final_value_replacement_loop to handle bitop
with an invariant induction.
This patch will enable below optimization:
{
- long unsigned int bit;
-
- <bb 2> [local count: 32534376]:
-
- <bb 3> [local count: 1041207449]:
- # tmp_10 = PHI <tmp_7(5), tmp_4(D)(2)>
- # bit_12 = PHI <bit_8(5), 0(2)>
- tmp_7 = bit2_6(D) & tmp_10;
- bit_8 = bit_12 + 1;
- if (bit_8 != 32)
- goto <bb 5>; [96.97%]
- else
- goto <bb 4>; [3.03%]
-
- <bb 5> [local count: 1009658865]:
- goto <bb 3>; [100.00%]
-
- <bb 4> [local count: 32534376]:
- # tmp_11 = PHI <tmp_7(3)>
- return tmp_11;
+ tmp_11 = tmp_4 (D) & bit2_6 (D);
+ return tmp_11;
}
gcc/ChangeLog:
PR middle-end/105735
* tree-scalar-evolution.cc
(analyze_and_compute_bitop_with_inv_effect): New function.
(final_value_replacement_loop): Enhanced to handle bitop
with inv induction.
gcc/testsuite/ChangeLog:
* gcc.target/i386/pr105735-1.c: New test.
* gcc.target/i386/pr105735-2.c: New test.
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