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| author | Segher Boessenkool <segher@kernel.crashing.org> | 2018-10-29 08:36:45 +0100 |
|---|---|---|
| committer | Segher Boessenkool <segher@gcc.gnu.org> | 2018-10-29 08:36:45 +0100 |
| commit | aef7647f4a0a5a344ca7c3b5e2a9f18123949411 (patch) | |
| tree | ba4685bfb0dc73e16e3d48106196d77812c10b34 /gcc | |
| parent | 6679694ac9a9b1103d0697a660554cdd1febf68a (diff) | |
| download | gcc-aef7647f4a0a5a344ca7c3b5e2a9f18123949411.zip gcc-aef7647f4a0a5a344ca7c3b5e2a9f18123949411.tar.gz gcc-aef7647f4a0a5a344ca7c3b5e2a9f18123949411.tar.bz2 | |
combine: Fix various shortcomings in make_more_copies (PR87701, PR87780)
This rewrites most of make_more_copies, in the process fixing a few PRs
and some other bugs, and working around a few target problems. Certain
notes turn out to actually change the meaning of the RTL, so we cannot
drop them; and i386 takes subregs of hard regs.
PR rtl-optimization/87701
PR rtl-optimization/87780
* combine.c (make_more_copies): Rewrite.
From-SVN: r265582
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/combine.c | 15 |
2 files changed, 11 insertions, 10 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index e1b641f..0dd2c51 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2018-10-29 Segher Boessenkool <segher@kernel.crashing.org> + + PR rtl-optimization/87701 + PR rtl-optimization/87780 + * combine.c (make_more_copies): Rewrite. + 2018-10-28 Kugan Vivekanandarajah <kuganv@linaro.org> * doc/generic.texi (ABSU_EXPR): Document. diff --git a/gcc/combine.c b/gcc/combine.c index 2b93328..3e20428 100644 --- a/gcc/combine.c +++ b/gcc/combine.c @@ -14956,25 +14956,20 @@ make_more_copies (void) rtx set = single_set (insn); if (!set) 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); + rtx src = SET_SRC (set); if (!(REG_P (src) && HARD_REGISTER_P (src))) continue; if (TEST_HARD_REG_BIT (fixed_reg_set, REGNO (src))) continue; rtx new_reg = gen_reg_rtx (GET_MODE (dest)); - rtx_insn *insn1 = gen_move_insn (new_reg, src); - rtx_insn *insn2 = gen_move_insn (dest, new_reg); - emit_insn_after (insn1, insn); - emit_insn_after (insn2, insn1); - delete_insn (insn); - - insn = insn2; + rtx_insn *new_insn = gen_move_insn (new_reg, src); + SET_SRC (set) = new_reg; + emit_insn_before (new_insn, insn); + df_insn_rescan (insn); } } } |