tree a2d32e3c8ac1eba6c34f94ea6f394b0e1a97fdfc
parent 8bc16f0e0e31061fde5baa4c1691f659043e746e
author Chris Lattner <sabre@nondot.org> 1200090701 +0000
committer Chris Lattner <sabre@nondot.org> 1200090701 +0000

Teach argpromote to ruthlessly hack small byval structs when it can
get away with it, which exposes opportunities to eliminate the memory
objects entirely.  For example, we now compile byval.ll to:

define internal void @f1(i32 %b.0, i64 %b.1) {
entry:
	%tmp2 = add i32 %b.0, 1		; <i32> [#uses=0]
	ret void
}

define i32 @main() nounwind  {
entry:
	call void @f1( i32 1, i64 2 )
	ret i32 0
}

This seems like it would trigger a lot for code that passes around small
structs (e.g. SDOperand's or _Complex)...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45886 91177308-0d34-0410-b5e6-96231b3b80d8