powerpc: PowerPC backend, meet C++20

C++20, in particular https://wg21.link/P1120R0 paper voted into it,
deprecates various operations between enumerators from different enumeration
types etc., and as we've switched to -std=gnu++20 by default, this now
results in warnings or errors during stage2 and onwards.

The following patch should fix rs6000 build.

2025-11-28  Jakub Jelinek  <jakub@redhat.com>

	* config/rs6000/rs6000.cc (complex_multiply_builtin_code):
	Avoid arithmetics between enumerators from different enum types.
	(complex_divide_builtin_code): Likewise.

diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index 1d5cd25c0f08188a4ac0080224df5920f1f4de20..bf899adc531570710b36918283f0e89c43345ee0 100644 (file)
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -28490,7 +28490,7 @@ static inline built_in_function
 complex_multiply_builtin_code (machine_mode mode)
 {
   gcc_assert (IN_RANGE (mode, MIN_MODE_COMPLEX_FLOAT, MAX_MODE_COMPLEX_FLOAT));
-  int func = BUILT_IN_COMPLEX_MUL_MIN + mode - MIN_MODE_COMPLEX_FLOAT;
+  int func = BUILT_IN_COMPLEX_MUL_MIN + (mode - MIN_MODE_COMPLEX_FLOAT);
   return (built_in_function) func;
 }
 
@@ -28501,7 +28501,7 @@ static inline built_in_function
 complex_divide_builtin_code (machine_mode mode)
 {
   gcc_assert (IN_RANGE (mode, MIN_MODE_COMPLEX_FLOAT, MAX_MODE_COMPLEX_FLOAT));
-  int func = BUILT_IN_COMPLEX_DIV_MIN + mode - MIN_MODE_COMPLEX_FLOAT;
+  int func = BUILT_IN_COMPLEX_DIV_MIN + (mode - MIN_MODE_COMPLEX_FLOAT);
   return (built_in_function) func;
 }