diff options
Diffstat (limited to 'gcc-4.7/gcc/emit-rtl.c')
| -rw-r--r-- | gcc-4.7/gcc/emit-rtl.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/gcc-4.7/gcc/emit-rtl.c b/gcc-4.7/gcc/emit-rtl.c index a95c14611..8a7ef4ac4 100644 --- a/gcc-4.7/gcc/emit-rtl.c +++ b/gcc-4.7/gcc/emit-rtl.c @@ -964,6 +964,22 @@ void set_reg_attrs_from_value (rtx reg, rtx x) { int offset; + bool can_be_reg_pointer = true; + + /* Don't call mark_reg_pointer for incompatible pointer sign + extension. */ + while (GET_CODE (x) == SIGN_EXTEND + || GET_CODE (x) == ZERO_EXTEND + || GET_CODE (x) == TRUNCATE + || (GET_CODE (x) == SUBREG && subreg_lowpart_p (x))) + { +#if defined(POINTERS_EXTEND_UNSIGNED) && !defined(HAVE_ptr_extend) + if ((GET_CODE (x) == SIGN_EXTEND && POINTERS_EXTEND_UNSIGNED) + || (GET_CODE (x) != SIGN_EXTEND && ! POINTERS_EXTEND_UNSIGNED)) + can_be_reg_pointer = false; +#endif + x = XEXP (x, 0); + } /* Hard registers can be reused for multiple purposes within the same function, so setting REG_ATTRS, REG_POINTER and REG_POINTER_ALIGN @@ -977,14 +993,14 @@ set_reg_attrs_from_value (rtx reg, rtx x) if (MEM_OFFSET_KNOWN_P (x)) REG_ATTRS (reg) = get_reg_attrs (MEM_EXPR (x), MEM_OFFSET (x) + offset); - if (MEM_POINTER (x)) + if (can_be_reg_pointer && MEM_POINTER (x)) mark_reg_pointer (reg, 0); } else if (REG_P (x)) { if (REG_ATTRS (x)) update_reg_offset (reg, x, offset); - if (REG_POINTER (x)) + if (can_be_reg_pointer && REG_POINTER (x)) mark_reg_pointer (reg, REGNO_POINTER_ALIGN (REGNO (x))); } } |