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llvm-project/llvm/test/CodeGen/X86/hhvm-cc.ll

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HHVM calling conventions. HHVM calling convention, hhvmcc, is used by HHVM JIT for functions in translated cache. We currently support LLVM back end to generate code for X86-64 and may support other architectures in the future. In HHVM calling convention any GP register could be used to pass and return values, with the exception of R12 which is reserved for thread-local area and is callee-saved. Other than R12, we always pass RBX and RBP as args, which are our virtual machine's stack pointer and frame pointer respectively. When we enter translation cache via hhvmcc function, we expect the stack to be aligned at 16 bytes, i.e. skewed by 8 bytes as opposed to standard ABI alignment. This affects stack object alignment and stack adjustments for function calls. One extra calling convention, hhvm_ccc, is used to call C++ helpers from HHVM's translation cache. It is almost identical to standard C calling convention with an exception of first argument which is passed in RBP (before we use RDI, RSI, etc.) Differential Revision: http://reviews.llvm.org/D12681 llvm-svn: 248832
2015-09-30 06:09:16 +08:00
; RUN: llc < %s | FileCheck %s
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
declare hhvmcc i64 @bar(i64, i64, i64) nounwind
; Simply check we can modify %rbx and %rbp before returning via call to bar.
define hhvmcc i64 @foo(i64 %a, i64 %b, i64 %c) nounwind {
entry:
; CHECK-LABEL: foo:
; CHECK-DAG: movl $1, %ebx
; CHECK-DAG: movl $3, %ebp
; CHECK: jmp bar
%ret = musttail call hhvmcc i64 @bar(i64 1, i64 %b, i64 3)
ret i64 %ret
}
; Check that we can read and modify %rbx returned from PHP function.
define hhvmcc i64 @mod_return(i64 %a, i64 %b, i64 %c) nounwind {
entry:
; CHECK-LABEL: mod_return:
; CHECK-NEXT: {{^#.*}}
; CHECK-NEXT: callq bar
; CHECK-NEXT: incq %rbx
%tmp = call hhvmcc i64 @bar(i64 %a, i64 %b, i64 %c)
%retval = add i64 %tmp, 1
ret i64 %retval
}
%rettype = type { i64, i64, i64, i64, i64, i64, i64,
i64, i64, i64, i64, i64, i64, i64
}
; Check that we can return up to 14 64-bit args in registers.
define hhvmcc %rettype @return_all(i64 %a, i64 %b, i64 %c) nounwind {
entry:
; CHECK-LABEL: return_all:
; CHECK-DAG: movl $1, %ebx
; CHECK-DAG: movl $2, %ebp
; CHECK-DAG: movl $3, %edi
; CHECK-DAG: movl $4, %esi
; CHECK-DAG: movl $5, %edx
; CHECK-DAG: movl $6, %ecx
; CHECK-DAG: movl $7, %r8
; CHECK-DAG: movl $8, %r9
; CHECK-DAG: movl $9, %eax
; CHECK-DAG: movl $10, %r10
; CHECK-DAG: movl $11, %r11
; CHECK-DAG: movl $12, %r13
; CHECK-DAG: movl $13, %r14
; CHECK-DAG: movl $14, %r15
; CHECK: retq
%r1 = insertvalue %rettype zeroinitializer, i64 1, 0
%r2 = insertvalue %rettype %r1, i64 2, 1
%r3 = insertvalue %rettype %r2, i64 3, 2
%r4 = insertvalue %rettype %r3, i64 4, 3
%r5 = insertvalue %rettype %r4, i64 5, 4
%r6 = insertvalue %rettype %r5, i64 6, 5
%r7 = insertvalue %rettype %r6, i64 7, 6
%r8 = insertvalue %rettype %r7, i64 8, 7
%r9 = insertvalue %rettype %r8, i64 9, 8
%r10 = insertvalue %rettype %r9, i64 10, 9
%r11 = insertvalue %rettype %r10, i64 11, 10
%r12 = insertvalue %rettype %r11, i64 12, 11
%r13 = insertvalue %rettype %r12, i64 13, 12
%r14 = insertvalue %rettype %r13, i64 14, 13
ret %rettype %r14
}
declare hhvmcc void @return_all_tc(i64, i64, i64, i64, i64, i64, i64, i64,
i64, i64, i64, i64, i64, i64, i64)
; Check that we can return up to 14 64-bit args in registers via tail call.
define hhvmcc void @test_return_all_tc(i64 %a, i64 %b, i64 %c) nounwind {
entry:
; CHECK-LABEL: test_return_all_tc:
; CHECK-NEXT: {{^#.*}}
; CHECK-DAG: movl $1, %ebx
; CHECK-DAG: movl $3, %ebp
; CHECK-DAG: movl $4, %r15
; CHECK-DAG: movl $5, %edi
; CHECK-DAG: movl $6, %esi
; CHECK-DAG: movl $7, %edx
; CHECK-DAG: movl $8, %ecx
; CHECK-DAG: movl $9, %r8
; CHECK-DAG: movl $10, %r9
; CHECK-DAG: movl $11, %eax
; CHECK-DAG: movl $12, %r10
; CHECK-DAG: movl $13, %r11
; CHECK-DAG: movl $14, %r13
; CHECK-DAG: movl $15, %r14
; CHECK: jmp return_all_tc
tail call hhvmcc void @return_all_tc(
i64 1, i64 %b, i64 3, i64 4, i64 5, i64 6, i64 7,
i64 8, i64 9, i64 10, i64 11, i64 12, i64 13, i64 14, i64 15)
ret void
}
declare hhvmcc {i64, i64} @php_short(i64, i64, i64, i64)
define hhvmcc i64 @test_php_short(i64 %a, i64 %b, i64 %c) nounwind {
entry:
; CHECK-LABEL: test_php_short:
; CHECK-NEXT: {{^#.*}}
; CHECK-NEXT: movl $42, %r15
; CHECK-NEXT: callq php_short
; CHECK-NEXT: leaq (%rbp,%r12), %rbx
; CHECK-NEXT: retq
%pair = call hhvmcc {i64, i64} @php_short(i64 %a, i64 %b, i64 %c, i64 42)
%fp = extractvalue {i64, i64} %pair, 1
%rv = add i64 %fp, %b
ret i64 %rv
}
declare hhvmcc %rettype @php_all(i64, i64, i64, i64, i64, i64, i64,
i64, i64, i64, i64, i64, i64, i64, i64)
; Check that we can pass 15 arguments in registers.
; Also check that %r12 (2nd arg) is not spilled.
define hhvmcc i64 @test_php_all(i64 %a, i64 %b, i64 %c) nounwind {
entry:
; CHECK-LABEL: test_php_all:
; CHECK-NEXT: {{^#.*}}
; CHECK-NOT: sub
; CHECK-NOT: sub
; CHECK-DAG: movl $1, %ebx
; CHECK-DAG: movl $3, %ebp
; CHECK-DAG: movl $4, %r15
; CHECK-DAG: movl $5, %edi
; CHECK-DAG: movl $6, %esi
; CHECK-DAG: movl $7, %edx
; CHECK-DAG: movl $8, %ecx
; CHECK-DAG: movl $9, %r8
; CHECK-DAG: movl $10, %r9
; CHECK-DAG: movl $11, %eax
; CHECK-DAG: movl $12, %r10
; CHECK-DAG: movl $13, %r11
; CHECK-DAG: movl $14, %r13
; CHECK-DAG: movl $15, %r14
; CHECK: callq php_all
%pair = call hhvmcc %rettype @php_all(
i64 1, i64 %b, i64 3, i64 4, i64 5, i64 6, i64 7,
i64 8, i64 9, i64 10, i64 11, i64 12, i64 13, i64 14, i64 15)
%fp = extractvalue %rettype %pair, 1
%rv = add i64 %fp, %b
ret i64 %rv
}
declare hhvmcc void @svcreq(i64, i64, i64, i64, i64, i64, i64, i64, i64, i64,
i64, i64)
define hhvmcc void @test_svcreq(i64 %a, i64 %b, i64 %c) nounwind {
entry:
; CHECK-LABEL: test_svcreq:
; CHECK-DAG: movl $42, %r10
; CHECK-DAG: movl $1, %edi
; CHECK-DAG: movl $2, %esi
; CHECK-DAG: movl $3, %edx
; CHECK-DAG: movl $4, %ecx
; CHECK-DAG: movl $5, %r8
; CHECK-DAG: movl $6, %r9
; CHECK: jmp svcreq
tail call hhvmcc void @svcreq(i64 %a, i64 %b, i64 %c, i64 undef, i64 1,
i64 2, i64 3, i64 4, i64 5, i64 6, i64 undef,
i64 42)
ret void
}
declare hhvm_ccc void @helper_short(i64, i64, i64, i64, i64, i64, i64)
; Pass all arguments in registers and check that we don't adjust stack
; for the call.
define hhvmcc void @test_helper_short(i64 %a, i64 %b, i64 %c) nounwind {
entry:
; CHECK-LABEL: test_helper_short:
; CHECK-NOT: push
; CHECK-NOT: sub
; CHECK-DAG: movl $1, %edi
; CHECK-DAG: movl $2, %esi
; CHECK-DAG: movl $3, %edx
; CHECK-DAG: movl $4, %ecx
; CHECK-DAG: movl $5, %r8
; CHECK-DAG: movl $6, %r9
; CHECK: callq helper_short
call hhvm_ccc void @helper_short(i64 %c, i64 1, i64 2, i64 3, i64 4,
i64 5, i64 6)
ret void
}
declare hhvm_ccc void @helper(i64, i64, i64, i64, i64, i64, i64, i64, i64, i64)
define hhvmcc void @test_helper(i64 %a, i64 %b, i64 %c) nounwind {
entry:
; CHECK-LABEL: test_helper:
; CHECK-DAG: movl $1, %edi
; CHECK-DAG: movl $2, %esi
; CHECK-DAG: movl $3, %edx
; CHECK-DAG: movl $4, %ecx
; CHECK-DAG: movl $5, %r8
; CHECK-DAG: movl $6, %r9
; CHECK: callq helper
call hhvm_ccc void @helper(i64 %c, i64 1, i64 2, i64 3, i64 4, i64 5, i64 6,
i64 7, i64 8, i64 9)
ret void
}
; When we enter function with HHVM calling convention, the stack is aligned
; at 16 bytes. This means we align objects on the stack differently and
; adjust the stack differently for calls.
declare hhvm_ccc void @stack_helper(i64, i64, i64)
declare hhvm_ccc void @stack_helper2(<2 x double>, i64)
define hhvmcc void @test_stack_helper(i64 %a, i64 %b, i64 %c) nounwind {
entry:
; CHECK-LABEL: test_stack_helper:
; CHECK-NOT: push
; CHECK: subq $32, %rsp
; CHECK: movaps 16(%rsp), %xmm0
; CHECK: callq stack_helper2
%t1 = alloca <2 x double>, align 16
%t2 = alloca i64, align 8
%t3 = alloca i64, align 8
%load3 = load i64, i64 *%t3
call hhvm_ccc void @stack_helper(i64 %c, i64 %load3, i64 42)
%load = load <2 x double>, <2 x double> *%t1
%load2 = load i64, i64 *%t2
call hhvm_ccc void @stack_helper2(<2 x double> %load, i64 %load2)
ret void
}
; Check that we are not adjusting the stack before calling the helper.
define hhvmcc void @test_stack_helper2(i64 %a, i64 %b, i64 %c) nounwind {
entry:
; CHECK-LABEL: test_stack_helper2:
; CHECK-NOT: push
; CHECK-NOT: subq
call hhvm_ccc void @stack_helper(i64 %c, i64 7, i64 42)
ret void
}