[gcc r11-9534] powerpc: Fix asm machine directive for some CPUs

[gcc r11-9534] powerpc: Fix asm machine directive for some CPUs

[Sebastian Huber]

https://gcc.gnu.org/g:3cb53c10831be59d967d9dce8e7980fee4703500

commit r11-9534-g3cb53c10831be59d967d9dce8e7980fee4703500
Author: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date:   Tue Jan 18 12:44:53 2022 +0100

    powerpc: Fix asm machine directive for some CPUs
    
    For some CPUs, the assembler machine directive cannot be determined by ISA
    flags.
    
    gcc/
    
            PR target/104090
            * config/rs6000/rs6000.c (rs6000_machine_from_flags): Use also
            rs6000_cpu.

Diff:
---
 gcc/config/rs6000/rs6000.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index c4f5c53932c..9b1c3a8b5ea 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -5766,6 +5766,34 @@ const char *rs6000_machine;
 const char *
 rs6000_machine_from_flags (void)
 {
+  /* For some CPUs, the machine cannot be determined by ISA flags.  We have to
+     check them first.  */
+  switch (rs6000_cpu)
+    {
+    case PROCESSOR_PPC8540:
+    case PROCESSOR_PPC8548:
+      return "e500";
+
+    case PROCESSOR_PPCE300C2:
+    case PROCESSOR_PPCE300C3:
+      return "e300";
+
+    case PROCESSOR_PPCE500MC:
+      return "e500mc";
+
+    case PROCESSOR_PPCE500MC64:
+      return "e500mc64";
+
+    case PROCESSOR_PPCE5500:
+      return "e5500";
+
+    case PROCESSOR_PPCE6500:
+      return "e6500";
+
+    default:
+      break;
+    }
+
   HOST_WIDE_INT flags = rs6000_isa_flags;
 
   /* Disable the flags that should never influence the .machine selection.  */