PR target/108589 - Check REG_P for AARCH64_FUSE_ADDSUB_2REG_CONST1

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.

(cherry picked from commit a39c6ec97906766ad65d15d4856fd41121ee7a45)

diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index 2d01c06ff3052241c512a359234410f69c1bea7d..226dc9dffd47fcab3e39237de4013bca38f92800 100644 (file)
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -25630,6 +25630,7 @@ 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 (file)
index 0000000..861727f
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/pr108589.c
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target lp64 } */
+/* { dg-options "-Os -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);
+}