Fix register count when not splitting Complex IEEE 128-bit args.

For ABI_V4, we do not split complex args. This created a problem because
even though an arg would be passed in two VSX regs, we were only advancing the
function arg counter by one VSX register. Fixed with this patch.

	PR target/99685

gcc/
	* config/rs6000/rs6000-call.cc (rs6000_function_arg_advance_1): Bump
	register count when not splitting IEEE 128-bit Complex.

diff --git a/gcc/config/rs6000/rs6000-call.cc b/gcc/config/rs6000/rs6000-call.cc
index 6011fe8d3c568b6b95cc48aeceb7af13f79383fd..551968b0995c321f02a69541772255e3bfa4aca0 100644 (file)
--- a/gcc/config/rs6000/rs6000-call.cc
+++ b/gcc/config/rs6000/rs6000-call.cc
@@ -1111,6 +1111,12 @@ rs6000_function_arg_advance_1 (CUMULATIVE_ARGS *cum, machine_mode mode,
        {
          cum->vregno += n_elts;
 
+         /* If we are not splitting Complex IEEE128 args then account for the
+            fact that they are passed in 2 VSX regs. */
+         if (!targetm.calls.split_complex_arg && type
+             && TREE_CODE (type) == COMPLEX_TYPE && elt_mode == KCmode)
+           cum->vregno++;
+
          if (!TARGET_ALTIVEC)
            error ("cannot pass argument in vector register because"
                   " altivec instructions are disabled, use %qs"