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* [gcc r13-2575] xtensa: Make complex hard register clobber elimination more robust and accurate
@ 2022-09-09 22:21 Max Filippov
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From: Max Filippov @ 2022-09-09 22:21 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:89afb2e86fcb29c559b2957fdcbea0d01740c49b
commit r13-2575-g89afb2e86fcb29c559b2957fdcbea0d01740c49b
Author: Takayuki 'January June' Suwa <jjsuwa_sys3175@yahoo.co.jp>
Date: Thu Sep 1 14:49:13 2022 +0900
xtensa: Make complex hard register clobber elimination more robust and accurate
This patch eliminates all clobbers for complex hard registers that will
be overwritten entirely afterwards (supersedence of
3867d414bd7d9e5b6fb2a51b1fb3d9e9e1eae9).
gcc/ChangeLog:
* config/xtensa/xtensa.md: Rewrite the split pattern that performs
the abovementioned process so that insns that overwrite clobbered
register no longer need to be contiguous.
(DSC): Remove as no longer needed.
Diff:
---
gcc/config/xtensa/xtensa.md | 67 ++++++++++++++++++++++++++++++---------------
1 file changed, 45 insertions(+), 22 deletions(-)
diff --git a/gcc/config/xtensa/xtensa.md b/gcc/config/xtensa/xtensa.md
index 3ed269249a4..f722ea56289 100644
--- a/gcc/config/xtensa/xtensa.md
+++ b/gcc/config/xtensa/xtensa.md
@@ -86,10 +86,6 @@
;; This code iterator is for *shlrd and its variants.
(define_code_iterator ior_op [ior plus])
-;; This mode iterator allows the DC and SC patterns to be defined from
-;; the same template.
-(define_mode_iterator DSC [DC SC])
-
\f
;; Attributes.
@@ -2843,27 +2839,54 @@
})
(define_split
- [(clobber (match_operand:DSC 0 "register_operand"))]
- "GP_REG_P (REGNO (operands[0]))"
+ [(clobber (match_operand 0 "register_operand"))]
+ "HARD_REGISTER_P (operands[0])
+ && COMPLEX_MODE_P (GET_MODE (operands[0]))"
[(const_int 0)]
{
- unsigned int regno = REGNO (operands[0]);
- machine_mode inner_mode = GET_MODE_INNER (<MODE>mode);
+ auto_sbitmap bmp (FIRST_PSEUDO_REGISTER);
rtx_insn *insn;
- rtx x;
- if (! ((insn = next_nonnote_nondebug_insn (curr_insn))
- && NONJUMP_INSN_P (insn)
- && GET_CODE (x = PATTERN (insn)) == SET
- && REG_P (x = XEXP (x, 0))
- && GET_MODE (x) == inner_mode
- && REGNO (x) == regno
- && (insn = next_nonnote_nondebug_insn (insn))
- && NONJUMP_INSN_P (insn)
- && GET_CODE (x = PATTERN (insn)) == SET
- && REG_P (x = XEXP (x, 0))
- && GET_MODE (x) == inner_mode
- && REGNO (x) == regno + REG_NREGS (operands[0]) / 2))
- FAIL;
+ rtx reg = gen_rtx_REG (SImode, 0);
+ bitmap_set_range (bmp, REGNO (operands[0]), REG_NREGS (operands[0]));
+ for (insn = next_nonnote_nondebug_insn_bb (curr_insn);
+ insn; insn = next_nonnote_nondebug_insn_bb (insn))
+ {
+ sbitmap_iterator iter;
+ unsigned int regno;
+ if (NONJUMP_INSN_P (insn))
+ {
+ EXECUTE_IF_SET_IN_BITMAP (bmp, 2, regno, iter)
+ {
+ set_regno_raw (reg, regno, REG_NREGS (reg));
+ if (reg_overlap_mentioned_p (reg, PATTERN (insn)))
+ break;
+ }
+ if (GET_CODE (PATTERN (insn)) == SET)
+ {
+ rtx x = SET_DEST (PATTERN (insn));
+ if (REG_P (x) && HARD_REGISTER_P (x))
+ bitmap_clear_range (bmp, REGNO (x), REG_NREGS (x));
+ else if (SUBREG_P (x) && HARD_REGISTER_P (SUBREG_REG (x)))
+ {
+ struct subreg_info info;
+ subreg_get_info (regno = REGNO (SUBREG_REG (x)),
+ GET_MODE (SUBREG_REG (x)),
+ SUBREG_BYTE (x), GET_MODE (x), &info);
+ if (!info.representable_p)
+ break;
+ bitmap_clear_range (bmp, regno + info.offset, info.nregs);
+ }
+ }
+ if (bitmap_empty_p (bmp))
+ goto FALLTHRU;
+ }
+ else if (CALL_P (insn))
+ EXECUTE_IF_SET_IN_BITMAP (bmp, 2, regno, iter)
+ if (call_used_or_fixed_reg_p (regno))
+ break;
+ }
+ FAIL;
+FALLTHRU:;
})
(define_peephole2
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