https://dyncall.org/pub/dyncall/dyncall/rev/d982a00c2177

Index: dyncallback/dyncall_callback_ppc64.S
--- dyncallback/dyncall_callback_ppc64.S.orig
+++ dyncallback/dyncall_callback_ppc64.S
@@ -147,9 +147,9 @@ Input:
 	bctrl
 
 	/* check result type */
-	cmpi    cr0, r3, 0x66 /* 'f */
+	cmpi    cr0, 0, r3, 0x66 /* 'f */
 	beq     .f32
-	cmpi    cr0, r3, 0x64 /* 'd */
+	cmpi    cr0, 0, r3, 0x64 /* 'd */
 	beq     .f64
 .i64:
 	ld      r3, SP_RESULT(r1)