diff options
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 25 |
1 files changed, 15 insertions, 10 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index ec138584c38..04af01e6ea2 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -1,5 +1,5 @@ /* RTL simplification functions for GNU compiler. - Copyright (C) 1987-2013 Free Software Foundation, Inc. + Copyright (C) 1987-2014 Free Software Foundation, Inc. This file is part of GCC. @@ -640,11 +640,16 @@ simplify_truncation (enum machine_mode mode, rtx op, XEXP (op, 0), origmode); } - /* Simplify (truncate:SI (op:DI (x:DI) (y:DI))) - to (op:SI (truncate:SI (x:DI)) (truncate:SI (x:DI))). */ - if (GET_CODE (op) == PLUS - || GET_CODE (op) == MINUS - || GET_CODE (op) == MULT) + /* If the machine can perform operations in the truncated mode, distribute + the truncation, i.e. simplify (truncate:QI (op:SI (x:SI) (y:SI))) into + (op:QI (truncate:QI (x:SI)) (truncate:QI (y:SI))). */ + if (1 +#ifdef WORD_REGISTER_OPERATIONS + && precision >= BITS_PER_WORD +#endif + && (GET_CODE (op) == PLUS + || GET_CODE (op) == MINUS + || GET_CODE (op) == MULT)) { rtx op0 = simplify_gen_unary (TRUNCATE, mode, XEXP (op, 0), op_mode); if (op0) @@ -1642,7 +1647,7 @@ simplify_const_unary_operation (enum rtx_code code, enum machine_mode mode, break; case NEG: - val = - arg0; + val = - (unsigned HOST_WIDE_INT) arg0; break; case ABS: @@ -4112,15 +4117,15 @@ simplify_const_binary_operation (enum rtx_code code, enum machine_mode mode, switch (code) { case PLUS: - val = arg0s + arg1s; + val = (unsigned HOST_WIDE_INT) arg0s + arg1s; break; case MINUS: - val = arg0s - arg1s; + val = (unsigned HOST_WIDE_INT) arg0s - arg1s; break; case MULT: - val = arg0s * arg1s; + val = (unsigned HOST_WIDE_INT) arg0s * arg1s; break; case DIV: |