mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2025-01-31 20:51:52 +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
29 lines
1.2 KiB
LLVM
29 lines
1.2 KiB
LLVM
; RUN: llc < %s -mcpu=generic -mtriple=x86_64-linux -post-RA-scheduler=true | FileCheck %s
|
|
; RUN: llc < %s -mcpu=generic -mtriple=x86_64-win32 -post-RA-scheduler=true | FileCheck %s
|
|
|
|
; FIXME: Redundant unused stack allocation could be eliminated.
|
|
; CHECK: subq ${{24|72|80}}, %rsp
|
|
|
|
; Check that lowered arguments on the stack do not overwrite each other.
|
|
; Add %in1 %p1 to a different temporary register (%eax).
|
|
; CHECK: movl [[A1:32|144]](%rsp), [[R1:%e..]]
|
|
; Move param %in1 to temp register (%r10d).
|
|
; CHECK: movl [[A2:40|152]](%rsp), [[R2:%[a-z0-9]+]]
|
|
; Add %in1 %p1 to a different temporary register (%eax).
|
|
; CHECK: addl {{%edi|%ecx}}, [[R1]]
|
|
; Move param %in2 to stack.
|
|
; CHECK-DAG: movl [[R2]], [[A1]](%rsp)
|
|
; Move result of addition to stack.
|
|
; CHECK-DAG: movl [[R1]], [[A2]](%rsp)
|
|
; Eventually, do a TAILCALL
|
|
; CHECK: TAILCALL
|
|
|
|
declare tailcc i32 @tailcallee(i32 %p1, i32 %p2, i32 %p3, i32 %p4, i32 %p5, i32 %p6, i32 %a, i32 %b) nounwind
|
|
|
|
define tailcc i32 @tailcaller(i32 %p1, i32 %p2, i32 %p3, i32 %p4, i32 %p5, i32 %p6, i32 %in1, i32 %in2) nounwind {
|
|
entry:
|
|
%tmp = add i32 %in1, %p1
|
|
%retval = tail call tailcc i32 @tailcallee(i32 %p1, i32 %p2, i32 %p3, i32 %p4, i32 %p5, i32 %p6, i32 %in2,i32 %tmp)
|
|
ret i32 %retval
|
|
}
|