[PATCH] Fix PR 103288, ICE after PHI-OPT, move an assigment when still in use for another bb

apinski@marvell.com apinski@marvell.com
Wed Nov 17 07:46:54 GMT 2021


From: Andrew Pinski <apinski@marvell.com>

The problem is r12-5300-gf98f373dd822b35c allows phiopt to recognize more basic blocks
but missed one location where phiopt could move an assignment from the middle block
to the non-middle one.  This patch fixes that.

OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.

	PR 103288

gcc/ChangeLog:

	* tree-ssa-phiopt.c (value_replacement): Return early if middle
	block has more than one pred.

gcc/testsuite/ChangeLog:

	* gcc.c-torture/compile/pr103288-1.c: New test.
---
 gcc/testsuite/gcc.c-torture/compile/pr103288-1.c | 6 ++++++
 gcc/tree-ssa-phiopt.c                            | 3 +++
 2 files changed, 9 insertions(+)
 create mode 100644 gcc/testsuite/gcc.c-torture/compile/pr103288-1.c

diff --git a/gcc/testsuite/gcc.c-torture/compile/pr103288-1.c b/gcc/testsuite/gcc.c-torture/compile/pr103288-1.c
new file mode 100644
index 00000000000..88d1c675599
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/pr103288-1.c
@@ -0,0 +1,6 @@
+
+int ui_5;
+long func_14_uli_8;
+void func_14() {
+        ui_5 &= (func_14_uli_8 ? 60 : ui_5) ? 5 : 0;
+}
diff --git a/gcc/tree-ssa-phiopt.c b/gcc/tree-ssa-phiopt.c
index 6b22f6bedd4..8984a5e15ab 100644
--- a/gcc/tree-ssa-phiopt.c
+++ b/gcc/tree-ssa-phiopt.c
@@ -1381,6 +1381,9 @@ value_replacement (basic_block cond_bb, basic_block middle_bb,
 	}
     }
 
+  if (!single_pred_p (middle_bb))
+    return 0;
+
   /* Now optimize (x != 0) ? x + y : y to just x + y.  */
   gsi = gsi_last_nondebug_bb (middle_bb);
   if (gsi_end_p (gsi))
-- 
2.17.1



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