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-rw-r--r--gcc/config/rs6000/rs6000-modes.def4
1 files changed, 3 insertions, 1 deletions
diff --git a/gcc/config/rs6000/rs6000-modes.def b/gcc/config/rs6000/rs6000-modes.def
index 54548be7038..5124e1665d4 100644
--- a/gcc/config/rs6000/rs6000-modes.def
+++ b/gcc/config/rs6000/rs6000-modes.def
@@ -42,5 +42,7 @@ VECTOR_MODES (FLOAT, 8); /* V4HF V2SF */
VECTOR_MODES (FLOAT, 16); /* V8HF V4SF V2DF */
VECTOR_MODES (FLOAT, 32); /* V16HF V8SF V4DF */
-/* Replacement for TImode that only is allowed in GPRs. */
+/* Replacement for TImode that only is allowed in GPRs. We also use PTImode
+ for quad memory atomic operations to force getting an even/odd register
+ combination. */
PARTIAL_INT_MODE (TI);