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| author | Richard Biener <rguenther@suse.de> | 2023-03-22 10:05:19 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2023-04-19 10:28:42 +0200 |
| commit | 8f81100115f68b37fb2723e987c14a3185d1f47d (patch) | |
| tree | a1f531a5ddafa3ff6d56d67739c5d33de14401b3 /gcc/cfgcleanup.cc | |
| parent | 794ffdb0fb6312ce07af0bfc797bef9f4cff4c61 (diff) | |
| download | gcc-8f81100115f68b37fb2723e987c14a3185d1f47d.zip gcc-8f81100115f68b37fb2723e987c14a3185d1f47d.tar.gz gcc-8f81100115f68b37fb2723e987c14a3185d1f47d.tar.bz2 | |
rtl-optimization/109237 - speedup bb_is_just_return
For the testcase bb_is_just_return is on top of the profile, changing
it to walk BB insns backwards puts it off the profile. That's because
in the forward walk you have to process possibly many debug insns
but in a backward walk you very likely run into control insns first.
PR rtl-optimization/109237
* cfgcleanup.cc (bb_is_just_return): Walk insns backwards.
Diffstat (limited to 'gcc/cfgcleanup.cc')
| -rw-r--r-- | gcc/cfgcleanup.cc | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/gcc/cfgcleanup.cc b/gcc/cfgcleanup.cc index 194e0e5..78f59e9 100644 --- a/gcc/cfgcleanup.cc +++ b/gcc/cfgcleanup.cc @@ -2608,14 +2608,14 @@ bb_is_just_return (basic_block bb, rtx_insn **ret, rtx_insn **use) if (bb == EXIT_BLOCK_PTR_FOR_FN (cfun)) return false; - FOR_BB_INSNS (bb, insn) + FOR_BB_INSNS_REVERSE (bb, insn) if (NONDEBUG_INSN_P (insn)) { rtx pat = PATTERN (insn); if (!*ret && ANY_RETURN_P (pat)) *ret = insn; - else if (!*ret && !*use && GET_CODE (pat) == USE + else if (*ret && !*use && GET_CODE (pat) == USE && REG_P (XEXP (pat, 0)) && REG_FUNCTION_VALUE_P (XEXP (pat, 0))) *use = insn; |