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hanchenye-llvm-project/llvm/test/CodeGen/X86/frameallocate.ll

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Add the llvm.frameallocate and llvm.recoverframeallocation intrinsics These intrinsics allow multiple functions to share a single stack allocation from one function's call frame. The function with the allocation may only perform one allocation, and it must be in the entry block. Functions accessing the allocation call llvm.recoverframeallocation with the function whose frame they are accessing and a frame pointer from an active call frame of that function. These intrinsics are very difficult to inline correctly, so the intention is that they be introduced rarely, or at least very late during EH preparation. Reviewers: echristo, andrew.w.kaylor Differential Revision: http://reviews.llvm.org/D6493 llvm-svn: 225746
2015-01-13 08:48:10 +08:00
; RUN: llc -mtriple=x86_64-windows-msvc < %s | FileCheck %s
declare i8* @llvm.frameallocate(i32)
declare i8* @llvm.frameaddress(i32)
Rename llvm.recoverframeallocation to llvm.framerecover This name is less descriptive, but it sort of puts things in the 'llvm.frame...' namespace, relating it to frameallocate and frameaddress. It also avoids using "allocate" and "allocation" together. llvm-svn: 225752
2015-01-13 09:51:34 +08:00
declare i8* @llvm.framerecover(i8*, i8*)
Add the llvm.frameallocate and llvm.recoverframeallocation intrinsics These intrinsics allow multiple functions to share a single stack allocation from one function's call frame. The function with the allocation may only perform one allocation, and it must be in the entry block. Functions accessing the allocation call llvm.recoverframeallocation with the function whose frame they are accessing and a frame pointer from an active call frame of that function. These intrinsics are very difficult to inline correctly, so the intention is that they be introduced rarely, or at least very late during EH preparation. Reviewers: echristo, andrew.w.kaylor Differential Revision: http://reviews.llvm.org/D6493 llvm-svn: 225746
2015-01-13 08:48:10 +08:00
declare i32 @printf(i8*, ...)
@str = internal constant [10 x i8] c"asdf: %d\0A\00"
define void @print_framealloc_from_fp(i8* %fp) {
Rename llvm.recoverframeallocation to llvm.framerecover This name is less descriptive, but it sort of puts things in the 'llvm.frame...' namespace, relating it to frameallocate and frameaddress. It also avoids using "allocate" and "allocation" together. llvm-svn: 225752
2015-01-13 09:51:34 +08:00
%alloc = call i8* @llvm.framerecover(i8* bitcast (void(i32*, i32*)* @alloc_func to i8*), i8* %fp)
Add the llvm.frameallocate and llvm.recoverframeallocation intrinsics These intrinsics allow multiple functions to share a single stack allocation from one function's call frame. The function with the allocation may only perform one allocation, and it must be in the entry block. Functions accessing the allocation call llvm.recoverframeallocation with the function whose frame they are accessing and a frame pointer from an active call frame of that function. These intrinsics are very difficult to inline correctly, so the intention is that they be introduced rarely, or at least very late during EH preparation. Reviewers: echristo, andrew.w.kaylor Differential Revision: http://reviews.llvm.org/D6493 llvm-svn: 225746
2015-01-13 08:48:10 +08:00
%alloc_i32 = bitcast i8* %alloc to i32*
%r = load i32* %alloc_i32
call i32 (i8*, ...)* @printf(i8* getelementptr ([10 x i8]* @str, i32 0, i32 0), i32 %r)
ret void
}
; CHECK-LABEL: print_framealloc_from_fp:
; CHECK: movabsq $.Lframeallocation_alloc_func, %[[offs:[a-z]+]]
; CHECK: movl (%rcx,%[[offs]]), %edx
; CHECK: leaq {{.*}}(%rip), %rcx
; CHECK: callq printf
; CHECK: retq
define void @alloc_func(i32* %s, i32* %d) {
%alloc = call i8* @llvm.frameallocate(i32 16)
%alloc_i32 = bitcast i8* %alloc to i32*
store i32 42, i32* %alloc_i32
%fp = call i8* @llvm.frameaddress(i32 0)
call void @print_framealloc_from_fp(i8* %fp)
ret void
}
; CHECK-LABEL: alloc_func:
; CHECK: .Lframeallocation_alloc_func = -[[offs:[0-9]+]]
; CHECK: movl $42, -[[offs]](%rbp)
; CHECK: movq %rbp, %rcx
; CHECK: callq print_framealloc_from_fp
; CHECK: retq