[PATCH-3v5, rs6000] Implement optab_isnormal for SFDF and IEEE128

[HAO CHEN GUI]

Hi,
  This patch implemented optab_isnormal for SFDF and IEEE128 by
test data class instructions.

  Compared with previous version, the main change is to merge
the patterns of SFDF and IEEE128 into one.
https://gcc.gnu.org/pipermail/gcc-patches/2024-June/655781.html

  Bootstrapped and tested on powerpc64-linux BE and LE with no
regressions. Is it OK for trunk?

Thanks
Gui Haochen

ChangeLog
rs6000: Implement optab_isnormal for SFDF and IEEE128

gcc/
	PR target/97786
	* config/rs6000/vsx.md (isnormal<mode>2): New expand.

gcc/testsuite/
	PR target/97786
	* gcc.target/powerpc/pr97786-7.c: New test.
	* gcc.target/powerpc/pr97786-8.c: New test.

patch.diff
diff --git a/gcc/config/rs6000/vsx.md b/gcc/config/rs6000/vsx.md
index 763cd916c8d..f818aba9e3e 100644
--- a/gcc/config/rs6000/vsx.md
+++ b/gcc/config/rs6000/vsx.md
@@ -5318,6 +5318,23 @@ (define_expand "isfinite<mode>2"
   DONE;
 })

+(define_expand "isnormal<mode>2"
+  [(use (match_operand:SI 0 "gpc_reg_operand"))
+   (use (match_operand:IEEE_FP 1 "<fp_register_op>"))]
+  "TARGET_P9_VECTOR
+   && (!FLOAT128_IEEE_P (<MODE>mode) || TARGET_FLOAT128_HW)"
+{
+  rtx tmp = gen_reg_rtx (SImode);
+  int mask = VSX_TEST_DATA_CLASS_NAN
+	     | VSX_TEST_DATA_CLASS_POS_INF | VSX_TEST_DATA_CLASS_NEG_INF
+	     | VSX_TEST_DATA_CLASS_POS_ZERO | VSX_TEST_DATA_CLASS_NEG_ZERO
+	     | VSX_TEST_DATA_CLASS_POS_DENORMAL
+	     | VSX_TEST_DATA_CLASS_NEG_DENORMAL;
+  emit_insn (gen_xststdc_<mode> (tmp, operands[1], GEN_INT (mask)));
+  emit_insn (gen_xorsi3 (operands[0], tmp, const1_rtx));
+  DONE;
+})
+
 ;; The VSX Scalar Test Negative Quad-Precision
 (define_expand "xststdcnegqp_<mode>"
   [(set (match_dup 2)
diff --git a/gcc/testsuite/gcc.target/powerpc/pr97786-7.c b/gcc/testsuite/gcc.target/powerpc/pr97786-7.c
new file mode 100644
index 00000000000..eb01eed39d3
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr97786-7.c
@@ -0,0 +1,17 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mdejagnu-cpu=power9" } */
+/* { dg-require-effective-target powerpc_vsx } */
+
+int test1 (double x)
+{
+  return __builtin_isnormal (x);
+}
+
+int test2 (float x)
+{
+  return __builtin_isnormal (x);
+}
+
+/* { dg-final { scan-assembler-not {\mfcmp} } } */
+/* { dg-final { scan-assembler-times {\mxststdcsp\M} 1 } } */
+/* { dg-final { scan-assembler-times {\mxststdcdp\M} 1 } } */
diff --git a/gcc/testsuite/gcc.target/powerpc/pr97786-8.c b/gcc/testsuite/gcc.target/powerpc/pr97786-8.c
new file mode 100644
index 00000000000..eba90d3b1b7
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr97786-8.c
@@ -0,0 +1,12 @@
+/* { dg-do compile } */
+/* { dg-require-effective-target ppc_float128_hw } */
+/* { dg-options "-O2 -mdejagnu-cpu=power9 -mabi=ieeelongdouble -Wno-psabi" } */
+/* { dg-require-effective-target powerpc_vsx } */
+
+int test1 (long double x)
+{
+  return __builtin_isnormal (x);
+}
+
+/* { dg-final { scan-assembler-not {\mxscmpuqp\M} } } */
+/* { dg-final { scan-assembler {\mxststdcqp\M} } } */