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25f7df1bce
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 llvm-svn: 122783
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
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declare fastcc i32 @callee(i32 %arg)
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define fastcc i32 @directcall(i32 %arg) {
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entry:
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; This is the large code model, so &callee may not fit into the jmp
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; instruction. Instead, stick it into a register.
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; CHECK: movabsq $callee, [[REGISTER:%r[a-z0-9]+]]
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; CHECK: jmpq *[[REGISTER]] # TAILCALL
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%res = tail call fastcc i32 @callee(i32 %arg)
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ret i32 %res
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}
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; Check that the register used for an indirect tail call doesn't
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; clobber any of the arguments.
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define fastcc i32 @indirect_manyargs(i32(i32,i32,i32,i32,i32,i32,i32)* %target) {
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; Adjust the stack to enter the function. (The amount of the
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; adjustment may change in the future, in which case the location of
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; the stack argument and the return adjustment will change too.)
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; CHECK: pushq
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; Put the call target into R11, which won't be clobbered while restoring
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; callee-saved registers and won't be used for passing arguments.
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; CHECK: movq %rdi, %rax
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; Pass the stack argument.
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; CHECK: movl $7, 16(%rsp)
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; Pass the register arguments, in the right registers.
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; CHECK: movl $1, %edi
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; CHECK: movl $2, %esi
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; CHECK: movl $3, %edx
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; CHECK: movl $4, %ecx
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; CHECK: movl $5, %r8d
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; CHECK: movl $6, %r9d
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; Adjust the stack to "return".
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; CHECK: popq
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; And tail-call to the target.
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; CHECK: jmpq *%rax # TAILCALL
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%res = tail call fastcc i32 %target(i32 1, i32 2, i32 3, i32 4, i32 5,
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i32 6, i32 7)
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ret i32 %res
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}
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; Check that the register used for a direct tail call doesn't clobber
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; any of the arguments.
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declare fastcc i32 @manyargs_callee(i32,i32,i32,i32,i32,i32,i32)
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define fastcc i32 @direct_manyargs() {
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; Adjust the stack to enter the function. (The amount of the
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; adjustment may change in the future, in which case the location of
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; the stack argument and the return adjustment will change too.)
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; CHECK: pushq
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; Pass the stack argument.
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; CHECK: movl $7, 16(%rsp)
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; Pass the register arguments, in the right registers.
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; CHECK: movl $1, %edi
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; CHECK: movl $2, %esi
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; CHECK: movl $3, %edx
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; CHECK: movl $4, %ecx
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; CHECK: movl $5, %r8d
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; CHECK: movl $6, %r9d
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; This is the large code model, so &manyargs_callee may not fit into
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; the jmp instruction. Put it into R11, which won't be clobbered
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; while restoring callee-saved registers and won't be used for passing
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; arguments.
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; CHECK: movabsq $manyargs_callee, %rax
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; Adjust the stack to "return".
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; CHECK: popq
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; And tail-call to the target.
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; CHECK: jmpq *%rax # TAILCALL
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%res = tail call fastcc i32 @manyargs_callee(i32 1, i32 2, i32 3, i32 4,
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i32 5, i32 6, i32 7)
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ret i32 %res
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}
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