[Bug tree-optimization/126486] codesize regression by 17.5% for spec2017 507.catcuBSSN_r caused by r15-6657 with O2
"liuhongt at gcc dot gnu.org via Gcc-bugs" <[email protected]>
| Newsgroups | gmane.comp.gcc.bugs |
|---|---|
| Message-ID | <[email protected]/bugzilla/> |
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126486 --- Comment #1 from Hongtao Liu <liuhongt at gcc dot gnu.org> --- The canonicalization introduced by r15-6657 make the loop invariant of inner loop not simlified and caused extra use in the outer loop and regressed performance. invariant of inner loop 761<Invariant Expressions>: 762inv_expr 1: (unsigned long) k_117 * 8 + (unsigned long) input_array_dims_95(D) 763inv_expr 2: ((unsigned long) k_117 * 8 + (unsigned long) input_array_dims_95(D)) - (unsigned long) (int) ((unsigned int) k_117 + 4294967294) * 8 764inv_expr 3: ((unsigned long) k_117 * 8 + (unsigned long) input_array_dims_95(D)) - (unsigned long) (int) ((unsigned int) k_117 + 4294967295) * 8 765inv_expr 4: (((unsigned long) k_117 * 8 + (unsigned long) input_array_dims_95(D)) - (unsigned long) ((unsigned int) k_117 + 4294967295) * 8) + 18446744073709551600 766inv_expr 5: (((unsigned long) k_117 * 8 + (unsigned long) input_array_dims_95(D)) - (unsigned long) ((unsigned int) k_117 + 4294967295) * 8) + 18446744073709551608 (k_117 * 8 + xxx) - (k_117 - 1) * 8 is not simplied because of the convert chain. and it caused extra groups for the outer loop for the intermiediate expr of those invariant 1012 Use 0.0: 1013 At stmt: _102 = _103 + 4294967295; 1014 At pos: 1015 IV struct: 1016 Type: unsigned int 1017 Base: (unsigned int) N_dims_72(D) + 4294967294 1018 Step: 4294967295 1019 Biv: N 1020 Overflowness wrto loop niter: Overflow 1021Group 1: 1022 Type: GENERIC 1023 Use 1.0: 1024 At stmt: _130 = _131 + _132; 1025 At pos: 1026 IV struct: 1027 Type: unsigned long 1028 Base: ((unsigned long) N_dims_72(D) * 8 + (unsigned long) input_array_dims_95(D)) + 18446744073709551608 1029 Step: 18446744073709551608 1030 Object: (void *) input_array_dims_95(D) 1031 Biv: N 1032 Overflowness wrto loop niter: Overflow 1033Group 2: 1012 Use 0.0: 1013 At stmt: _102 = _103 + 4294967295; 1014 At pos: 1015 IV struct: 1016 Type: unsigned int 1017 Base: (unsigned int) N_dims_72(D) + 4294967294 1018 Step: 4294967295 1019 Biv: N 1020 Overflowness wrto loop niter: Overflow 1021Group 1: 1022 Type: GENERIC 1023 Use 1.0: 1024 At stmt: _130 = _131 + _132; 1025 At pos: 1026 IV struct: 1027 Type: unsigned long 1028 Base: ((unsigned long) N_dims_72(D) * 8 + (unsigned long) input_array_dims_95(D)) + 18446744073709551608 1029 Step: 18446744073709551608 1030 Object: (void *) input_array_dims_95(D) 1031 Biv: N 1032 Overflowness wrto loop niter: Overflow 1033Group 2: