mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-21 00:32:23 +00:00
7158e08b8e
prologue and epilogue if the adjustment is 8. Similarly, use pushl / popl if the adjustment is 4 in 32-bit mode. In the epilogue, takes care to pop to a caller-saved register that's not live at the exit (either return or tailcall instruction). rdar://8771137 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122783 91177308-0d34-0410-b5e6-96231b3b80d8
72 lines
2.7 KiB
LLVM
72 lines
2.7 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-linux-gnu -tailcallopt -code-model=large | FileCheck %s
|
|
|
|
declare fastcc i32 @callee(i32 %arg)
|
|
define fastcc i32 @directcall(i32 %arg) {
|
|
entry:
|
|
; This is the large code model, so &callee may not fit into the jmp
|
|
; instruction. Instead, stick it into a register.
|
|
; CHECK: movabsq $callee, [[REGISTER:%r[a-z0-9]+]]
|
|
; CHECK: jmpq *[[REGISTER]] # TAILCALL
|
|
%res = tail call fastcc i32 @callee(i32 %arg)
|
|
ret i32 %res
|
|
}
|
|
|
|
; Check that the register used for an indirect tail call doesn't
|
|
; clobber any of the arguments.
|
|
define fastcc i32 @indirect_manyargs(i32(i32,i32,i32,i32,i32,i32,i32)* %target) {
|
|
; Adjust the stack to enter the function. (The amount of the
|
|
; adjustment may change in the future, in which case the location of
|
|
; the stack argument and the return adjustment will change too.)
|
|
; CHECK: pushq
|
|
; Put the call target into R11, which won't be clobbered while restoring
|
|
; callee-saved registers and won't be used for passing arguments.
|
|
; CHECK: movq %rdi, %rax
|
|
; Pass the stack argument.
|
|
; CHECK: movl $7, 16(%rsp)
|
|
; Pass the register arguments, in the right registers.
|
|
; CHECK: movl $1, %edi
|
|
; CHECK: movl $2, %esi
|
|
; CHECK: movl $3, %edx
|
|
; CHECK: movl $4, %ecx
|
|
; CHECK: movl $5, %r8d
|
|
; CHECK: movl $6, %r9d
|
|
; Adjust the stack to "return".
|
|
; CHECK: popq
|
|
; And tail-call to the target.
|
|
; CHECK: jmpq *%rax # TAILCALL
|
|
%res = tail call fastcc i32 %target(i32 1, i32 2, i32 3, i32 4, i32 5,
|
|
i32 6, i32 7)
|
|
ret i32 %res
|
|
}
|
|
|
|
; Check that the register used for a direct tail call doesn't clobber
|
|
; any of the arguments.
|
|
declare fastcc i32 @manyargs_callee(i32,i32,i32,i32,i32,i32,i32)
|
|
define fastcc i32 @direct_manyargs() {
|
|
; Adjust the stack to enter the function. (The amount of the
|
|
; adjustment may change in the future, in which case the location of
|
|
; the stack argument and the return adjustment will change too.)
|
|
; CHECK: pushq
|
|
; Pass the stack argument.
|
|
; CHECK: movl $7, 16(%rsp)
|
|
; Pass the register arguments, in the right registers.
|
|
; CHECK: movl $1, %edi
|
|
; CHECK: movl $2, %esi
|
|
; CHECK: movl $3, %edx
|
|
; CHECK: movl $4, %ecx
|
|
; CHECK: movl $5, %r8d
|
|
; CHECK: movl $6, %r9d
|
|
; This is the large code model, so &manyargs_callee may not fit into
|
|
; the jmp instruction. Put it into R11, which won't be clobbered
|
|
; while restoring callee-saved registers and won't be used for passing
|
|
; arguments.
|
|
; CHECK: movabsq $manyargs_callee, %rax
|
|
; Adjust the stack to "return".
|
|
; CHECK: popq
|
|
; And tail-call to the target.
|
|
; CHECK: jmpq *%rax # TAILCALL
|
|
%res = tail call fastcc i32 @manyargs_callee(i32 1, i32 2, i32 3, i32 4,
|
|
i32 5, i32 6, i32 7)
|
|
ret i32 %res
|
|
}
|