From 24c50999b5af9cd09fb72f22d8d1c2f46772df2e Mon Sep 17 00:00:00 2001 From: Joern Rennecke Date: Wed, 6 Nov 1996 03:48:54 +0000 Subject: [PATCH] (gen_shl_and): Try to generate shorter constant for and. From-SVN: r13101 --- gcc/config/sh/sh.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/gcc/config/sh/sh.c b/gcc/config/sh/sh.c index cafbc5169ca..c1bfc0e7476 100644 --- a/gcc/config/sh/sh.c +++ b/gcc/config/sh/sh.c @@ -1273,6 +1273,11 @@ gen_shl_and (dest, left_rtx, mask_rtx, source) shift_gen_fun = gen_shifty_op; case 2: case 3: + /* If the topmost bit that matters is set, set the topmost bits + that don't matter. This way, we might be able to get a shorter + signed constant. */ + if (mask & ((HOST_WIDE_INT)1 << 31 - total_shift)) + mask |= (HOST_WIDE_INT)~0 << (31 - total_shift); /* Don't expand fine-grained when combining, because that will make the pattern fail. */ if (rtx_equal_function_value_matters -- 2.30.2