mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-23 11:13:28 +01:00
a973c0bd85
When the target option GuaranteedTailCallOpt is specified, calls with the fastcc calling convention will be transformed into tail calls if they are in tail position. This diff adds a new calling convention, tailcc, currently supported only on X86, which behaves the same way as fastcc, except that the GuaranteedTailCallOpt flag does not need to enabled in order to enable tail call optimization. Patch by Dwight Guth <dwight.guth@runtimeverification.com>! Reviewed By: lebedev.ri, paquette, rnk Differential Revision: https://reviews.llvm.org/D67855 llvm-svn: 373976
24 lines
744 B
LLVM
24 lines
744 B
LLVM
; RUN: llc < %s -mtriple=i686-unknown-linux -no-x86-call-frame-opt | FileCheck %s
|
|
; Linux has 8 byte alignment so the params cause stack size 20,
|
|
; ensure that a normal tailcc call has matching stack size
|
|
|
|
|
|
define tailcc i32 @tailcallee(i32 %a1, i32 %a2, i32 %a3, i32 %a4) {
|
|
ret i32 %a3
|
|
}
|
|
|
|
define tailcc i32 @tailcaller(i32 %in1, i32 %in2, i32 %in3, i32 %in4) {
|
|
%tmp11 = tail call tailcc i32 @tailcallee(i32 %in1, i32 %in2,
|
|
i32 %in1, i32 %in2)
|
|
ret i32 %tmp11
|
|
}
|
|
|
|
define i32 @main(i32 %argc, i8** %argv) {
|
|
%tmp1 = call tailcc i32 @tailcaller( i32 1, i32 2, i32 3, i32 4 )
|
|
; expect match subl [stacksize] here
|
|
ret i32 0
|
|
}
|
|
|
|
; CHECK: calll tailcaller
|
|
; CHECK-NEXT: subl $12
|