72 lines
1.9 KiB
Diff
72 lines
1.9 KiB
Diff
cprop: Fix -fcompare-debug bug in constprop_register [PR100148]
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The following testcase shows different behavior between -g and -g0
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in constprop_register, if a flags register setter is separated
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from a conditional jump using those flags with -g by a DEBUG_INSN.
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As it uses just NEXT_INSN, for -g it will look at the DEBUG_INSN which is
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not a conditional jump, while otherwise it would look at the conditional
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jump and call cprop_jump.
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2021-04-21 Jakub Jelinek <jakub@redhat.com>
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PR rtl-optimization/100148
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* cprop.c (constprop_register): Use next_nondebug_insn instead of
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NEXT_INSN.
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* g++.dg/opt/pr100148.C: New test.
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--- gcc/cprop.c
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+++ gcc/cprop.c
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@@ -1007,16 +1007,18 @@ static int
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constprop_register (rtx from, rtx src, rtx_insn *insn)
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{
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rtx sset;
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+ rtx_insn *next_insn;
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/* Check for reg or cc0 setting instructions followed by
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conditional branch instructions first. */
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if ((sset = single_set (insn)) != NULL
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- && NEXT_INSN (insn)
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- && any_condjump_p (NEXT_INSN (insn)) && onlyjump_p (NEXT_INSN (insn)))
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+ && (next_insn = next_nondebug_insn (insn)) != NULL
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+ && any_condjump_p (next_insn)
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+ && onlyjump_p (next_insn))
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{
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rtx dest = SET_DEST (sset);
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if ((REG_P (dest) || CC0_P (dest))
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- && cprop_jump (BLOCK_FOR_INSN (insn), insn, NEXT_INSN (insn),
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+ && cprop_jump (BLOCK_FOR_INSN (insn), insn, next_insn,
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from, src))
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return 1;
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}
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--- gcc/testsuite/g++.dg/opt/pr100148.C
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+++ gcc/testsuite/g++.dg/opt/pr100148.C
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@@ -0,0 +1,27 @@
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+// PR rtl-optimization/100148
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+// { dg-do compile }
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+// { dg-options "-O2 -fno-dce -fno-tree-dce -fno-tree-dominator-opts -fno-tree-sink -fcompare-debug" }
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+
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+int i;
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+enum E { } e, ee;
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+
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+bool
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+baz (int)
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+{
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+ return ee;
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+}
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+
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+bool bar ();
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+bool a, b;
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+
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+void
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+foo ()
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+{
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+ switch (ee)
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+ {
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+ case 0:
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+ e = E (a ? : i);
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+ case 1:
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+ !(b || baz (0) && bar ());
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+ }
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+}
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