[gcc r12-621] amdgcn: disable TImode

[gcc r12-621] amdgcn: disable TImode

[Andrew Stubbs]

https://gcc.gnu.org/g:7af392687952608b988bd5a476583106b3f51740

commit r12-621-g7af392687952608b988bd5a476583106b3f51740
Author: Andrew Stubbs <ams@codesourcery.com>
Date:   Fri May 7 15:42:21 2021 +0100

    amdgcn: disable TImode
    
    The TImode support works for moves only, which has worked in most case up
    to now, but no longer.
    
    We still need TImode to exist for the instructions that take two DImode
    values packed together, but we don't need to advertise this to the middle-end.
    
    gcc/ChangeLog:
    
            * config/gcn/gcn.c (gcn_scalar_mode_supported_p): Disable TImode.

Diff:
---
 gcc/config/gcn/gcn.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/config/gcn/gcn.c b/gcc/config/gcn/gcn.c
index 9660ca6eaa4..2baf91d2f1f 100644
--- a/gcc/config/gcn/gcn.c
+++ b/gcc/config/gcn/gcn.c
@@ -361,7 +361,7 @@ gcn_scalar_mode_supported_p (scalar_mode mode)
 	  || mode == HImode /* || mode == HFmode  */
 	  || mode == SImode || mode == SFmode
 	  || mode == DImode || mode == DFmode
-	  || mode == TImode);
+	  /*|| mode == TImode*/); /* TI is used for back-end purposes only.  */
 }
 
 /* Implement TARGET_CLASS_MAX_NREGS.