[gcc r11-9347] ipa-sra: Check also ECF_LOOPING_CONST_OR_PURE when evaluating calls

[Martin Jambor]

https://gcc.gnu.org/g:5e2e6cc84c46ff7ceb6395c0309a2c6b71d83cb1

commit r11-9347-g5e2e6cc84c46ff7ceb6395c0309a2c6b71d83cb1
Author: Martin Jambor <mjambor@suse.cz>
Date:   Wed Dec 1 14:13:35 2021 +0100

    ipa-sra: Check also ECF_LOOPING_CONST_OR_PURE when evaluating calls
    
    in PR 103267 Honza found out that IPA-SRA does not look at
    ECF_LOOPING_CONST_OR_PURE when evaluating if a call can have side
    effects.  Fixed with this patch.  The testcase infinitely loops in a
    const function, so it would not make a good addition to the testsuite.
    
    gcc/ChangeLog:
    
    2021-11-29  Martin Jambor  <mjambor@suse.cz>
    
            PR ipa/103267
            * ipa-sra.c (scan_function): Also check ECF_LOOPING_CONST_OR_PURE flag.
    
    (cherry picked from commit e5440bc08e07fd491dcccd47e1b86a5985ee117c)

Diff:
---
 gcc/ipa-sra.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/ipa-sra.c b/gcc/ipa-sra.c
index 6cde066b7dc..bbdb4cbfd1d 100644
--- a/gcc/ipa-sra.c
+++ b/gcc/ipa-sra.c
@@ -1931,7 +1931,8 @@ scan_function (cgraph_node *node, struct function *fun)
 		if (lhs)
 		  scan_expr_access (lhs, stmt, ISRA_CTX_STORE, bb);
 		int flags = gimple_call_flags (stmt);
-		if ((flags & (ECF_CONST | ECF_PURE)) == 0)
+		if (((flags & (ECF_CONST | ECF_PURE)) == 0)
+		    || (flags & ECF_LOOPING_CONST_OR_PURE))
 		  bitmap_set_bit (final_bbs, bb->index);
 	      }
 	      break;