From e0226bda0d50970307f62148d0bbd02999bb6ae8 Mon Sep 17 00:00:00 2001 From: mpf Date: Fri, 16 Jan 2015 12:31:01 +0000 Subject: Account for high/lo_sum simplification with displacements gcc/ * simplify-rtx.c (simplify_replace_fn_rtx): Simplify (lo_sum (high x) y) to y if x and y have the same base. gcc/testsuite/ * gcc.c-torture/compile/20150108.c: New test. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@219729 138bc75d-0d04-0410-961f-82ee72b054a4 --- gcc/simplify-rtx.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) (limited to 'gcc/simplify-rtx.c') diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index 4ee63d21a58..d26267d1717 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -539,9 +539,15 @@ simplify_replace_fn_rtx (rtx x, const_rtx old_rtx, op0 = simplify_replace_fn_rtx (XEXP (x, 0), old_rtx, fn, data); op1 = simplify_replace_fn_rtx (XEXP (x, 1), old_rtx, fn, data); - /* (lo_sum (high x) x) -> x */ - if (GET_CODE (op0) == HIGH && rtx_equal_p (XEXP (op0, 0), op1)) - return op1; + /* (lo_sum (high x) y) -> y where x and y have the same base. */ + if (GET_CODE (op0) == HIGH) + { + rtx base0, base1, offset0, offset1; + split_const (XEXP (op0, 0), &base0, &offset0); + split_const (op1, &base1, &offset1); + if (rtx_equal_p (base0, base1)) + return op1; + } if (op0 == XEXP (x, 0) && op1 == XEXP (x, 1)) return x; -- cgit v1.2.1