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-rw-r--r--gcc/function.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/gcc/function.c b/gcc/function.c
index 5e01c65..0799216 100644
--- a/gcc/function.c
+++ b/gcc/function.c
@@ -4549,6 +4549,26 @@ assign_parms (fndecl)
&& nominal_mode != BLKmode && nominal_mode != passed_mode)
stack_parm = 0;
+ /* When an argument is passed in multiple locations, we can't
+ make use of this information, but we can save some copying if
+ the whole argument is passed in a single register. */
+ if (GET_CODE (entry_parm) == PARALLEL
+ && nominal_mode != BLKmode && passed_mode != BLKmode)
+ {
+ int i, len = XVECLEN (entry_parm, 0);
+
+ for (i = 0; i < len; i++)
+ if (XEXP (XVECEXP (entry_parm, 0, i), 0) != NULL_RTX
+ && GET_CODE (XEXP (XVECEXP (entry_parm, 0, i), 0)) == REG
+ && (GET_MODE (XEXP (XVECEXP (entry_parm, 0, i), 0))
+ == passed_mode)
+ && XINT (XEXP (XVECEXP (entry_parm, 0, i), 1), 0) == 0)
+ {
+ entry_parm = XEXP (XVECEXP (entry_parm, 0, i), 0);
+ break;
+ }
+ }
+
/* ENTRY_PARM is an RTX for the parameter as it arrives,
in the mode in which it arrives.
STACK_PARM is an RTX for a stack slot where the parameter can live