diff options
Diffstat (limited to 'gcc/combine.c')
| -rw-r--r-- | gcc/combine.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/gcc/combine.c b/gcc/combine.c index 87daa28..39ef3c6 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -8170,12 +8170,15 @@ make_compound_operation_int (machine_mode mode, rtx *x_ptr, || GET_CODE (inner) == SUBREG /* (subreg:SI (and:DI (reg:DI) (const_int 0x800000000)) 0) is (const_int 0), rather than - (subreg:SI (lshiftrt:DI (reg:DI) (const_int 35)) 0). */ + (subreg:SI (lshiftrt:DI (reg:DI) (const_int 35)) 0). + Similarly (subreg:QI (and:SI (reg:SI) (const_int 0x80)) 0) + for non-equality comparisons against 0 is not equivalent + to (subreg:QI (lshiftrt:SI (reg:SI) (const_int 7)) 0). */ || (GET_CODE (inner) == AND && CONST_INT_P (XEXP (inner, 1)) && GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (inner)) && exact_log2 (UINTVAL (XEXP (inner, 1))) - >= GET_MODE_BITSIZE (mode)))) + >= GET_MODE_BITSIZE (mode) - 1))) subreg_code = SET; tem = make_compound_operation (inner, subreg_code); |