diff options
Diffstat (limited to 'gcc/simplify-rtx.c')
| -rw-r--r-- | gcc/simplify-rtx.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index cd7e28b..3293f0b 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -343,9 +343,22 @@ simplify_replace_rtx (x, old, new) return replace_equiv_address_nv (x, simplify_replace_rtx (XEXP (x, 0), old, new)); + else if (code == LO_SUM) + { + rtx op0 = simplify_replace_rtx (XEXP (x, 0), old, new); + rtx op1 = simplify_replace_rtx (XEXP (x, 1), old, new); - if (REG_P (x) && REG_P (old) && REGNO (x) == REGNO (old)) - return new; + /* (lo_sum (high x) x) -> x */ + if (GET_CODE (op0) == HIGH && rtx_equal_p (XEXP (op0, 0), op1)) + return op1; + + return gen_rtx_LO_SUM (mode, op0, op1); + } + else if (code == REG) + { + if (REG_P (old) && REGNO (x) == REGNO (old)) + return new; + } return x; |