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* [gcc r10-9881] [PR98722] LRA: Check that target has no 3-op add insn to transform 2 plus expression.
@ 2021-06-02 22:26 Przemyslaw Wirkus
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From: Przemyslaw Wirkus @ 2021-06-02 22:26 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:1791b11d9cae388ae18a768eeb96c998439c986a
commit r10-9881-g1791b11d9cae388ae18a768eeb96c998439c986a
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date: Wed Jan 20 11:40:14 2021 -0500
[PR98722] LRA: Check that target has no 3-op add insn to transform 2 plus expression.
Patch cf2ac1c30af0fa783c8d72e527904dda5d8cc330 for solving PR97969 was
assumed for targets with absent 3-op add insn. But the original patch did
not check this. This patch adds the check.
gcc/ChangeLog:
PR rtl-optimization/98722
* lra-eliminations.c (eliminate_regs_in_insn): Check that target
has no 3-op add insn to transform insns containing two pluses.
gcc/testsuite/ChangeLog:
PR rtl-optimization/98722
* g++.target/s390/pr98722.C: New.
(cherry picked from commit 4334b524274203125193a08a8485250c41c2daa9)
Diff:
---
gcc/lra-eliminations.c | 5 ++++-
gcc/testsuite/g++.target/s390/pr98722.C | 12 ++++++++++++
2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/gcc/lra-eliminations.c b/gcc/lra-eliminations.c
index e2d4b24db2a..d9e78d44312 100644
--- a/gcc/lra-eliminations.c
+++ b/gcc/lra-eliminations.c
@@ -1057,7 +1057,10 @@ eliminate_regs_in_insn (rtx_insn *insn, bool replace_p, bool first_p,
reg2 = SUBREG_REG (reg2);
if (REG_P (reg1) && REG_P (reg2)
&& REGNO (reg1) < FIRST_PSEUDO_REGISTER
- && REGNO (reg2) >= FIRST_PSEUDO_REGISTER)
+ && REGNO (reg2) >= FIRST_PSEUDO_REGISTER
+ && GET_MODE (reg1) == Pmode
+ && !have_addptr3_insn (gen_reg_rtx (Pmode), reg1,
+ XEXP (XEXP (SET_SRC (set), 0), 1)))
{
XEXP (XEXP (SET_SRC (set), 0), 0) = op2;
XEXP (SET_SRC (set), 1) = op1;
diff --git a/gcc/testsuite/g++.target/s390/pr98722.C b/gcc/testsuite/g++.target/s390/pr98722.C
new file mode 100644
index 00000000000..64edaf3de21
--- /dev/null
+++ b/gcc/testsuite/g++.target/s390/pr98722.C
@@ -0,0 +1,12 @@
+// { dg-do compile }
+// { dg-options "-Og -fno-tree-fre -fno-split-wide-types" }
+struct B {
+ virtual void Method();
+};
+typedef void (B::*fn_type_a)();
+
+int main() {
+ fn_type_a f(&B::Method);
+ B b;
+ (b.*f)();
+}
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