mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-21 12:02:58 +02:00
45072b933e
Summary: Initially, these intrinsics seemed like part of a family of "frame" related intrinsics, but now I think that's more confusing than helpful. Initially, the LangRef specified that this would create a new kind of allocation that would be allocated at a fixed offset from the frame pointer (EBP/RBP). We ended up dropping that design, and leaving the stack frame layout alone. These intrinsics are really about sharing local stack allocations, not frame pointers. I intend to go further and add an `llvm.localaddress()` intrinsic that returns whatever register (EBP, ESI, ESP, RBX) is being used to address locals, which should not be confused with the frame pointer. Naming suggestions at this point are welcome, I'm happy to re-run sed. Reviewers: majnemer, nicholas Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D11011 llvm-svn: 241633
129 lines
3.9 KiB
LLVM
129 lines
3.9 KiB
LLVM
; RUN: llc -mtriple=i686-windows-msvc < %s | FileCheck %s --check-prefix=X86
|
|
; RUN: llc -mtriple=x86_64-windows-msvc < %s | FileCheck %s --check-prefix=X64
|
|
|
|
declare void @llvm.localescape(...)
|
|
declare i8* @llvm.frameaddress(i32)
|
|
declare i8* @llvm.localrecover(i8*, i8*, i32)
|
|
declare i32 @printf(i8*, ...)
|
|
|
|
@str = internal constant [10 x i8] c"asdf: %d\0A\00"
|
|
|
|
define void @print_framealloc_from_fp(i8* %fp) {
|
|
%a.i8 = call i8* @llvm.localrecover(i8* bitcast (void()* @alloc_func to i8*), i8* %fp, i32 0)
|
|
%a = bitcast i8* %a.i8 to i32*
|
|
%a.val = load i32, i32* %a
|
|
call i32 (i8*, ...) @printf(i8* getelementptr ([10 x i8], [10 x i8]* @str, i32 0, i32 0), i32 %a.val)
|
|
%b.i8 = call i8* @llvm.localrecover(i8* bitcast (void()* @alloc_func to i8*), i8* %fp, i32 1)
|
|
%b = bitcast i8* %b.i8 to i32*
|
|
%b.val = load i32, i32* %b
|
|
call i32 (i8*, ...) @printf(i8* getelementptr ([10 x i8], [10 x i8]* @str, i32 0, i32 0), i32 %b.val)
|
|
store i32 42, i32* %b
|
|
%b2 = getelementptr i32, i32* %b, i32 1
|
|
%b2.val = load i32, i32* %b2
|
|
call i32 (i8*, ...) @printf(i8* getelementptr ([10 x i8], [10 x i8]* @str, i32 0, i32 0), i32 %b2.val)
|
|
ret void
|
|
}
|
|
|
|
; X64-LABEL: print_framealloc_from_fp:
|
|
; X64: movq %rcx, %[[parent_fp:[a-z]+]]
|
|
; X64: movl .Lalloc_func$frame_escape_0(%[[parent_fp]]), %edx
|
|
; X64: leaq {{.*}}(%rip), %[[str:[a-z]+]]
|
|
; X64: movq %[[str]], %rcx
|
|
; X64: callq printf
|
|
; X64: movl .Lalloc_func$frame_escape_1(%[[parent_fp]]), %edx
|
|
; X64: movq %[[str]], %rcx
|
|
; X64: callq printf
|
|
; X64: movl $42, .Lalloc_func$frame_escape_1(%[[parent_fp]])
|
|
; X64: retq
|
|
|
|
; X86-LABEL: print_framealloc_from_fp:
|
|
; X86: pushl %esi
|
|
; X86: subl $8, %esp
|
|
; X86: movl 16(%esp), %esi
|
|
; X86: movl Lalloc_func$frame_escape_0(%esi), %eax
|
|
; X86: movl %eax, 4(%esp)
|
|
; X86: movl $_str, (%esp)
|
|
; X86: calll _printf
|
|
; X86: movl Lalloc_func$frame_escape_1(%esi), %eax
|
|
; X86: movl %eax, 4(%esp)
|
|
; X86: movl $_str, (%esp)
|
|
; X86: calll _printf
|
|
; X86: movl $42, Lalloc_func$frame_escape_1(%esi)
|
|
; X86: movl $4, %eax
|
|
; X86: movl Lalloc_func$frame_escape_1(%esi,%eax), %eax
|
|
; X86: movl %eax, 4(%esp)
|
|
; X86: movl $_str, (%esp)
|
|
; X86: calll _printf
|
|
; X86: addl $8, %esp
|
|
; X86: popl %esi
|
|
; X86: retl
|
|
|
|
define void @alloc_func() {
|
|
%a = alloca i32
|
|
%b = alloca i32, i32 2
|
|
call void (...) @llvm.localescape(i32* %a, i32* %b)
|
|
store i32 42, i32* %a
|
|
store i32 13, i32* %b
|
|
%fp = call i8* @llvm.frameaddress(i32 0)
|
|
call void @print_framealloc_from_fp(i8* %fp)
|
|
ret void
|
|
}
|
|
|
|
; X64-LABEL: alloc_func:
|
|
; X64: subq $48, %rsp
|
|
; X64: .seh_stackalloc 48
|
|
; X64: leaq 48(%rsp), %rbp
|
|
; X64: .seh_setframe 5, 48
|
|
; X64: .Lalloc_func$frame_escape_0 = 44
|
|
; X64: .Lalloc_func$frame_escape_1 = 36
|
|
; X64: movl $42, -4(%rbp)
|
|
; X64: movl $13, -12(%rbp)
|
|
; X64: leaq -48(%rbp), %rcx
|
|
; X64: callq print_framealloc_from_fp
|
|
; X64: retq
|
|
|
|
; X86-LABEL: alloc_func:
|
|
; X86: pushl %ebp
|
|
; X86: movl %esp, %ebp
|
|
; X86: subl $16, %esp
|
|
; X86: Lalloc_func$frame_escape_0 = -4
|
|
; X86: Lalloc_func$frame_escape_1 = -12
|
|
; X86: movl $42, -4(%ebp)
|
|
; X86: movl $13, -12(%ebp)
|
|
; X86: movl %ebp, (%esp)
|
|
; X86: calll _print_framealloc_from_fp
|
|
; X86: addl $16, %esp
|
|
; X86: popl %ebp
|
|
; X86: retl
|
|
|
|
; Helper to make this a complete program so it can be compiled and tested.
|
|
define i32 @main() {
|
|
call void @alloc_func()
|
|
ret i32 0
|
|
}
|
|
|
|
define void @alloc_func_no_frameaddr() {
|
|
%a = alloca i32
|
|
%b = alloca i32
|
|
call void (...) @llvm.localescape(i32* %a, i32* %b)
|
|
store i32 42, i32* %a
|
|
store i32 13, i32* %b
|
|
call void @print_framealloc_from_fp(i8* null)
|
|
ret void
|
|
}
|
|
|
|
; X64-LABEL: alloc_func_no_frameaddr:
|
|
; X64: subq $40, %rsp
|
|
; X64: .seh_stackalloc 40
|
|
; X64: .seh_endprologue
|
|
; X64: .Lalloc_func_no_frameaddr$frame_escape_0 = 36
|
|
; X64: .Lalloc_func_no_frameaddr$frame_escape_1 = 32
|
|
; X64: movl $42, 36(%rsp)
|
|
; X64: movl $13, 32(%rsp)
|
|
; X64: xorl %ecx, %ecx
|
|
; X64: callq print_framealloc_from_fp
|
|
; X64: addq $40, %rsp
|
|
; X64: retq
|
|
|
|
; X86-LABEL: alloc_func_no_frameaddr:
|