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tree-ssa-sink: do not sink to in front of setjmp 

gcc/ChangeLog:

	* tree-ssa-sink.cc (select_best_block): Punt if selected block
	has incoming abnormal edges.

gcc/testsuite/ChangeLog:

	* gcc.dg/setjmp-7.c: New test.
This commit is contained in:
Alexander Monakov 2022-01-14 20:23:41 +03:00
parent 465802c0d4
commit 76c3f0dc2f
2 changed files with 19 additions and 0 deletions
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13
gcc/testsuite/gcc.dg/setjmp-7.c Normal file
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@ -0,0 +1,13 @@
/* { dg-do compile } */
/* { dg-options "-O2 -fno-guess-branch-probability -w" } */
/* { dg-require-effective-target indirect_jumps } */
struct __jmp_buf_tag { };
typedef struct __jmp_buf_tag jmp_buf[1];
struct globals { jmp_buf listingbuf; };
extern struct globals *const ptr_to_globals;
void foo()
{
if ( _setjmp ( ((*ptr_to_globals).listingbuf )))
;
}

6
gcc/tree-ssa-sink.cc
View File

@ -208,6 +208,12 @@ select_best_block (basic_block early_bb,
temp_bb = get_immediate_dominator (CDI_DOMINATORS, temp_bb);
}
/* Placing a statement before a setjmp-like function would be invalid
(it cannot be reevaluated when execution follows an abnormal edge).
If we selected a block with abnormal predecessors, just punt. */
if (bb_has_abnormal_pred (best_bb))
return early_bb;
/* If we found a shallower loop nest, then we always consider that
a win. This will always give us the most control dependent block
within that loop nest. */