git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119947
91177308-0d34-0410-b5e6-
96231b3b80d8
//===---------------------------------------------------------------------===//
+Linux is missing some basic tail call support:
+
+#include <math.h>
+double foo(double a) { return sin(a); }
+
+This compiles into this on x86-64 Linux (but not darwin):
+foo:
+ subq $8, %rsp
+ call sin
+ addq $8, %rsp
+ ret
+vs:
+
+foo:
+ jmp sin
+
+//===---------------------------------------------------------------------===//
+
Tail call optimization improvements: Tail call optimization currently
pushes all arguments on the top of the stack (their normal place for
non-tail call optimized calls) that source from the callers arguments