[PATCH, COMMITTED] PR target/108589 - Check REG_P for AARCH64_FUSE_ADDSUB_2REG_CONST1

[Philipp Tomsich <philipp.tomsich@vrull.eu>]

This adds a check for REG_P on SET_DEST for the new idiom recognizer
for AARCH64_FUSE_ADDSUB_2REG_CONST1.  The reported ICE is only
observable with checking=rtl.

Bootstrapped/regtested aarch64-linux, committed.

	PR target/108589

gcc/ChangeLog:

	* config/aarch64/aarch64.cc (aarch_macro_fusion_pair_p): Check
	REG_P on SET_DEST.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/pr108589.c: New test.

Signed-off-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
---

 gcc/config/aarch64/aarch64.cc               |  1 +
 gcc/testsuite/gcc.target/aarch64/pr108589.c | 15 +++++++++++++++
 2 files changed, 16 insertions(+)
 create mode 100644 gcc/testsuite/gcc.target/aarch64/pr108589.c

diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index 17c1e23e5b5..acc0cfe5f94 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -25704,6 +25704,7 @@ aarch_macro_fusion_pair_p (rtx_insn *prev, rtx_insn *curr)
 	  && CONST_INT_P (XEXP (curr_src, 1))
 	  && INTVAL (XEXP (curr_src, 1)) == polarity
 	  && REG_P (XEXP (curr_src, 0))
+	  && REG_P (SET_DEST (prev_set))
 	  && REGNO (SET_DEST (prev_set)) == REGNO (XEXP (curr_src, 0)))
 	return true;
     }
diff --git a/gcc/testsuite/gcc.target/aarch64/pr108589.c b/gcc/testsuite/gcc.target/aarch64/pr108589.c
new file mode 100644
index 00000000000..e9c5bc608af
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/pr108589.c
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target lp64 } */
+/* { dg-options "-O2 -mtune=ampere1a -fno-split-wide-types" } */
+
+int i;
+__int128 j;
+short s;
+
+void
+foo (void)
+{
+  j -= i;
+  int l = i - __builtin_sub_overflow_p (0, 61680, s);
+  j -= __builtin_mul_overflow_p (i, l, 0);
+}
-- 
2.34.1