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| author | Segher Boessenkool <segher@kernel.crashing.org> | 2018-10-25 00:34:40 +0200 |
|---|---|---|
| committer | Segher Boessenkool <segher@gcc.gnu.org> | 2018-10-25 00:34:40 +0200 |
| commit | b8ac95761a5c0a902fa2547e9345febf26713bf5 (patch) | |
| tree | a48e19391c14d046d4639b73ddd54954d831c418 | |
| parent | f8719680bfd5adf14aa91ce3017d59f7eac7f64e (diff) | |
| download | gcc-b8ac95761a5c0a902fa2547e9345febf26713bf5.zip gcc-b8ac95761a5c0a902fa2547e9345febf26713bf5.tar.gz gcc-b8ac95761a5c0a902fa2547e9345febf26713bf5.tar.bz2 | |
combine: Don't do make_more_copies for dest PC (PR87720)
Jumps are written in RTL as moves to PC. But the latter has no mode,
so we shouldn't try to use it. Since the optimization this routine
does does not really help for jumps at all, let's just skip it.
PR rtl-optimization/87720
* combine.c (make_more_copies): Skip if the dest is pc_rtx.
From-SVN: r265474
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/combine.c | 2 |
2 files changed, 7 insertions, 0 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index fdfca8b..da93f6f 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2018-10-24 Segher Boessenkool <segher@kernel.crashing.org> + + PR rtl-optimization/87720 + * combine.c (make_more_copies): Skip if the dest is pc_rtx. + 2018-10-24 Alexandre Oliva <aoliva@redhat.com> * gimple-ssa-isolate-paths.c diff --git a/gcc/combine.c b/gcc/combine.c index 8ec6809..2b93328 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -14958,6 +14958,8 @@ make_more_copies (void) continue; rtx src = SET_SRC (set); rtx dest = SET_DEST (set); + if (dest == pc_rtx) + continue; if (GET_CODE (src) == SUBREG) src = SUBREG_REG (src); if (!(REG_P (src) && HARD_REGISTER_P (src))) |