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llvm-mirror/test/CodeGen/X86/movtopush.ll
Petar Jovanovic 9686e666ef Correct dwarf unwind information in function epilogue 
This patch aims to provide correct dwarf unwind information in function
epilogue for X86.
It consists of two parts. The first part inserts CFI instructions that set
appropriate cfa offset and cfa register in emitEpilogue() in
X86FrameLowering. This part is X86 specific.

The second part is platform independent and ensures that:

* CFI instructions do not affect code generation (they are not counted as
  instructions when tail duplicating or tail merging)
* Unwind information remains correct when a function is modified by
  different passes. This is done in a late pass by analyzing information
  about cfa offset and cfa register in BBs and inserting additional CFI
  directives where necessary.

Added CFIInstrInserter pass:

* analyzes each basic block to determine cfa offset and register are valid
  at its entry and exit
* verifies that outgoing cfa offset and register of predecessor blocks match
  incoming values of their successors
* inserts additional CFI directives at basic block beginning to correct the
  rule for calculating CFA

Having CFI instructions in function epilogue can cause incorrect CFA
calculation rule for some basic blocks. This can happen if, due to basic
block reordering, or the existence of multiple epilogue blocks, some of the
blocks have wrong cfa offset and register values set by the epilogue block
above them.
CFIInstrInserter is currently run only on X86, but can be used by any target
that implements support for adding CFI instructions in epilogue.

Patch by Violeta Vukobrat.

Differential Revision: https://reviews.llvm.org/D42848

llvm-svn: 330706
2018-04-24 10:32:08 +00:00

535 lines
16 KiB
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; RUN: llc < %s -mtriple=i686-windows | FileCheck %s -check-prefix=NORMAL
; RUN: llc < %s -mtriple=i686-windows -no-x86-call-frame-opt | FileCheck %s -check-prefix=NOPUSH
; RUN: llc < %s -mtriple=x86_64-windows | FileCheck %s -check-prefix=X64
; RUN: llc < %s -mtriple=i686-windows -stackrealign -stack-alignment=32 | FileCheck %s -check-prefix=ALIGNED
; RUN: llc < %s -mtriple=i686-pc-linux | FileCheck %s -check-prefix=LINUX
%class.Class = type { i32 }
%struct.s = type { i64 }
declare void @good(i32 %a, i32 %b, i32 %c, i32 %d)
declare void @inreg(i32 %a, i32 inreg %b, i32 %c, i32 %d)
declare x86_thiscallcc void @thiscall(%class.Class* %class, i32 %a, i32 %b, i32 %c, i32 %d)
declare void @oneparam(i32 %a)
declare void @eightparams(i32 %a, i32 %b, i32 %c, i32 %d, i32 %e, i32 %f, i32 %g, i32 %h)
declare void @eightparams16(i16 %a, i16 %b, i16 %c, i16 %d, i16 %e, i16 %f, i16 %g, i16 %h)
declare void @eightparams64(i64 %a, i64 %b, i64 %c, i64 %d, i64 %e, i64 %f, i64 %g, i64 %h)
declare void @struct(%struct.s* byval %a, i32 %b, i32 %c, i32 %d)
declare void @inalloca(<{ %struct.s }>* inalloca)
declare i8* @llvm.stacksave()
declare void @llvm.stackrestore(i8*)
; We should get pushes for x86, even though there is a reserved call frame.
; Make sure we don't touch x86-64, and that turning it off works.
; NORMAL-LABEL: test1:
; NORMAL-NOT: subl {{.*}} %esp
; NORMAL: pushl $4
; NORMAL-NEXT: pushl $3
; NORMAL-NEXT: pushl $2
; NORMAL-NEXT: pushl $1
; NORMAL-NEXT: call
; NORMAL-NEXT: addl $16, %esp
; X64-LABEL: test1:
; X64: movl $1, %ecx
; X64-NEXT: movl $2, %edx
; X64-NEXT: movl $3, %r8d
; X64-NEXT: movl $4, %r9d
; X64-NEXT: callq good
; NOPUSH-LABEL: test1:
; NOPUSH: subl $16, %esp
; NOPUSH-NEXT: movl $4, 12(%esp)
; NOPUSH-NEXT: movl $3, 8(%esp)
; NOPUSH-NEXT: movl $2, 4(%esp)
; NOPUSH-NEXT: movl $1, (%esp)
; NOPUSH-NEXT: call
; NOPUSH-NEXT: addl $16, %esp
define void @test1() {
entry:
call void @good(i32 1, i32 2, i32 3, i32 4)
ret void
}
; If we have a reserved frame, we should have pushes
; NORMAL-LABEL: test2:
; NORMAL-NOT: subl {{.*}} %esp
; NORMAL: pushl $4
; NORMAL-NEXT: pushl $3
; NORMAL-NEXT: pushl $2
; NORMAL-NEXT: pushl $1
; NORMAL-NEXT: call
define void @test2(i32 %k) {
entry:
%a = alloca i32, i32 %k
call void @good(i32 1, i32 2, i32 3, i32 4)
ret void
}
; Again, we expect a sequence of 4 immediate pushes
; Checks that we generate the right pushes for >8bit immediates
; NORMAL-LABEL: test2b:
; NORMAL-NOT: subl {{.*}} %esp
; NORMAL: pushl $4096
; NORMAL-NEXT: pushl $3072
; NORMAL-NEXT: pushl $2048
; NORMAL-NEXT: pushl $1024
; NORMAL-NEXT: call
; NORMAL-NEXT: addl $16, %esp
define void @test2b() optsize {
entry:
call void @good(i32 1024, i32 2048, i32 3072, i32 4096)
ret void
}
; The first push should push a register
; NORMAL-LABEL: test3:
; NORMAL-NOT: subl {{.*}} %esp
; NORMAL: pushl $4
; NORMAL-NEXT: pushl $3
; NORMAL-NEXT: pushl $2
; NORMAL-NEXT: pushl %e{{..}}
; NORMAL-NEXT: call
; NORMAL-NEXT: addl $16, %esp
define void @test3(i32 %k) optsize {
entry:
%f = add i32 %k, 1
call void @good(i32 %f, i32 2, i32 3, i32 4)
ret void
}
; We support weird calling conventions
; NORMAL-LABEL: test4:
; NORMAL: movl $2, %eax
; NORMAL-NEXT: pushl $4
; NORMAL-NEXT: pushl $3
; NORMAL-NEXT: pushl $1
; NORMAL-NEXT: call
; NORMAL-NEXT: addl $12, %esp
define void @test4() optsize {
entry:
call void @inreg(i32 1, i32 2, i32 3, i32 4)
ret void
}
; NORMAL-LABEL: test4b:
; NORMAL: movl 4(%esp), %ecx
; NORMAL-NEXT: pushl $4
; NORMAL-NEXT: pushl $3
; NORMAL-NEXT: pushl $2
; NORMAL-NEXT: pushl $1
; NORMAL-NEXT: call
; NORMAL-NEXT: ret
define void @test4b(%class.Class* %f) optsize {
entry:
call x86_thiscallcc void @thiscall(%class.Class* %f, i32 1, i32 2, i32 3, i32 4)
ret void
}
; When there is no reserved call frame, check that additional alignment
; is added when the pushes don't add up to the required alignment.
; ALIGNED-LABEL: test5:
; ALIGNED: subl $16, %esp
; ALIGNED-NEXT: pushl $4
; ALIGNED-NEXT: pushl $3
; ALIGNED-NEXT: pushl $2
; ALIGNED-NEXT: pushl $1
; ALIGNED-NEXT: call
define void @test5(i32 %k) {
entry:
%a = alloca i32, i32 %k
call void @good(i32 1, i32 2, i32 3, i32 4)
ret void
}
; When the alignment adds up, do the transformation
; ALIGNED-LABEL: test5b:
; ALIGNED: pushl $8
; ALIGNED-NEXT: pushl $7
; ALIGNED-NEXT: pushl $6
; ALIGNED-NEXT: pushl $5
; ALIGNED-NEXT: pushl $4
; ALIGNED-NEXT: pushl $3
; ALIGNED-NEXT: pushl $2
; ALIGNED-NEXT: pushl $1
; ALIGNED-NEXT: call
define void @test5b() optsize {
entry:
call void @eightparams(i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8)
ret void
}
; When having to compensate for the alignment isn't worth it,
; don't use pushes.
; ALIGNED-LABEL: test5c:
; ALIGNED: movl $1, (%esp)
; ALIGNED-NEXT: call
define void @test5c() optsize {
entry:
call void @oneparam(i32 1)
ret void
}
; Check that pushing the addresses of globals (Or generally, things that
; aren't exactly immediates) isn't broken.
; Fixes PR21878.
; NORMAL-LABEL: test6:
; NORMAL: pushl $_ext
; NORMAL-NEXT: call
declare void @f(i8*)
@ext = external constant i8
define void @test6() {
call void @f(i8* @ext)
br label %bb
bb:
alloca i32
ret void
}
; Check that we fold simple cases into the push
; NORMAL-LABEL: test7:
; NORMAL-NOT: subl {{.*}} %esp
; NORMAL: movl 4(%esp), [[EAX:%e..]]
; NORMAL-NEXT: pushl $4
; NORMAL-NEXT: pushl ([[EAX]])
; NORMAL-NEXT: pushl $2
; NORMAL-NEXT: pushl $1
; NORMAL-NEXT: call
; NORMAL-NEXT: addl $16, %esp
define void @test7(i32* %ptr) optsize {
entry:
%val = load i32, i32* %ptr
call void @good(i32 1, i32 2, i32 %val, i32 4)
ret void
}
; Fold stack-relative loads into the push, with correct offset
; In particular, at the second push, %b was at 12(%esp) and
; %a wast at 8(%esp), but the second push bumped %esp, so %a
; is now it at 12(%esp)
; NORMAL-LABEL: test8:
; NORMAL: pushl $4
; NORMAL-NEXT: pushl 12(%esp)
; NORMAL-NEXT: pushl 12(%esp)
; NORMAL-NEXT: pushl $1
; NORMAL-NEXT: call
; NORMAL-NEXT: addl $16, %esp
define void @test8(i32 %a, i32 %b) optsize {
entry:
call void @good(i32 1, i32 %a, i32 %b, i32 4)
ret void
}
; If one function is using push instructions, and the other isn't
; (because it has frame-index references), then we must resolve
; these references correctly.
; NORMAL-LABEL: test9:
; NORMAL-NOT: leal (%esp),
; NORMAL: pushl $4
; NORMAL-NEXT: pushl $3
; NORMAL-NEXT: pushl $2
; NORMAL-NEXT: pushl $1
; NORMAL-NEXT: call
; NORMAL-NEXT: addl $16, %esp
; NORMAL-NEXT: movl (%esp), [[E1:%e..]]
; NORMAL-NEXT: movl 4(%esp), [[E2:%e..]]
; NORMAL-NEXT: leal 16(%esp), [[E3:%e..]]
; NORMAL-NEXT: leal 12(%esp), [[E4:%e..]]
; NORMAL-NEXT: pushl [[E3]]
; NORMAL-NEXT: pushl [[E4]]
; NORMAL-NEXT: pushl $6
; NORMAL-NEXT: pushl [[E2]]
; NORMAL-NEXT: pushl [[E1]]
; NORMAL-NEXT: call
; NORMAL-NEXT: addl $20, %esp
define void @test9() optsize {
entry:
%p = alloca i32, align 4
%q = alloca i32, align 4
%s = alloca %struct.s, align 4
call void @good(i32 1, i32 2, i32 3, i32 4)
%pv = ptrtoint i32* %p to i32
%qv = ptrtoint i32* %q to i32
call void @struct(%struct.s* byval %s, i32 6, i32 %qv, i32 %pv)
ret void
}
; We can end up with an indirect call which gets reloaded on the spot.
; Make sure we reference the correct stack slot - we spill into (%esp)
; and reload from 16(%esp) due to the pushes.
; NORMAL-LABEL: test10:
; NORMAL: movl $_good, [[ALLOC:.*]]
; NORMAL-NEXT: movl [[ALLOC]], [[EAX:%e..]]
; NORMAL-NEXT: movl [[EAX]], (%esp) # 4-byte Spill
; NORMAL: nop
; NORMAL: pushl $4
; NORMAL-NEXT: pushl $3
; NORMAL-NEXT: pushl $2
; NORMAL-NEXT: pushl $1
; NORMAL-NEXT: calll *16(%esp)
; NORMAL-NEXT: addl $24, %esp
define void @test10() optsize {
%stack_fptr = alloca void (i32, i32, i32, i32)*
store void (i32, i32, i32, i32)* @good, void (i32, i32, i32, i32)** %stack_fptr
%good_ptr = load volatile void (i32, i32, i32, i32)*, void (i32, i32, i32, i32)** %stack_fptr
call void asm sideeffect "nop", "~{ax},~{bx},~{cx},~{dx},~{bp},~{si},~{di}"()
call void (i32, i32, i32, i32) %good_ptr(i32 1, i32 2, i32 3, i32 4)
ret void
}
; We can't fold the load from the global into the push because of
; interference from the store
; NORMAL-LABEL: test11:
; NORMAL: movl _the_global, [[EAX:%e..]]
; NORMAL-NEXT: movl $42, _the_global
; NORMAL-NEXT: pushl $4
; NORMAL-NEXT: pushl $3
; NORMAL-NEXT: pushl $2
; NORMAL-NEXT: pushl [[EAX]]
; NORMAL-NEXT: call
; NORMAL-NEXT: addl $16, %esp
@the_global = external global i32
define void @test11() optsize {
%myload = load i32, i32* @the_global
store i32 42, i32* @the_global
call void @good(i32 %myload, i32 2, i32 3, i32 4)
ret void
}
; Converting one mov into a push isn't worth it when
; doing so forces too much overhead for other calls.
; NORMAL-LABEL: test12:
; NORMAL: pushl $8
; NORMAL-NEXT: pushl $7
; NORMAL-NEXT: pushl $6
; NORMAL-NEXT: pushl $5
; NORMAL-NEXT: calll _good
define void @test12() optsize {
entry:
%s = alloca %struct.s, align 4
call void @struct(%struct.s* %s, i32 2, i32 3, i32 4)
call void @good(i32 5, i32 6, i32 7, i32 8)
call void @struct(%struct.s* %s, i32 10, i32 11, i32 12)
ret void
}
; But if the gains outweigh the overhead, we should do it
; NORMAL-LABEL: test12b:
; NORMAL: pushl $4
; NORMAL-NEXT: pushl $3
; NORMAL-NEXT: pushl $2
; NORMAL-NEXT: pushl $1
; NORMAL-NEXT: calll _good
; NORMAL-NEXT: addl $16, %esp
; NORMAL=NEXT: movl (%esp), %eax
; NORMAL=NEXT: movl 4(%esp), %ecx
; NORMAL=NEXT: pushl $8
; NORMAL=NEXT: pushl $7
; NORMAL=NEXT: pushl $6
; NORMAL=NEXT: pushl %ecx
; NORMAL=NEXT: pushl %eax
; NORMAL=NEXT: calll _struct
; NORMAL=NEXT: addl $20, %esp
; NORMAL=NEXT: pushl $12
; NORMAL=NEXT: pushl $11
; NORMAL=NEXT: pushl $10
; NORMAL=NEXT: pushl $9
; NORMAL=NEXT: calll _good
; NORMAL=NEXT: addl $16, %esp
define void @test12b() optsize {
entry:
%s = alloca %struct.s, align 4
call void @good(i32 1, i32 2, i32 3, i32 4)
call void @struct(%struct.s* %s, i32 6, i32 7, i32 8)
call void @good(i32 9, i32 10, i32 11, i32 12)
ret void
}
; Make sure the add does not prevent folding loads into pushes.
; val1 and val2 will not be folded into pushes since they have
; an additional use, but val3 should be.
; NORMAL-LABEL: test13:
; NORMAL: movl ([[P1:%e..]]), [[V1:%e..]]
; NORMAL-NEXT: movl ([[P2:%e..]]), [[V2:%e..]]
; NORMAL-NEXT: , [[ADD:%e..]]
; NORMAL-NEXT: pushl [[ADD]]
; NORMAL-NEXT: pushl ([[P3:%e..]])
; NORMAL-NEXT: pushl [[V2]]
; NORMAL-NEXT: pushl [[V1]]
; NORMAL-NEXT: calll _good
; NORMAL: movl [[P3]], %eax
define i32* @test13(i32* inreg %ptr1, i32* inreg %ptr2, i32* inreg %ptr3) optsize {
entry:
%val1 = load i32, i32* %ptr1
%val2 = load i32, i32* %ptr2
%val3 = load i32, i32* %ptr3
%add = add i32 %val1, %val2
call void @good(i32 %val1, i32 %val2, i32 %val3, i32 %add)
ret i32* %ptr3
}
; Make sure to fold adjacent stack adjustments.
; LINUX-LABEL: pr27140:
; LINUX: subl $12, %esp
; LINUX: .cfi_def_cfa_offset 16
; LINUX-NOT: sub
; LINUX: pushl $4
; LINUX: .cfi_adjust_cfa_offset 4
; LINUX: pushl $3
; LINUX: .cfi_adjust_cfa_offset 4
; LINUX: pushl $2
; LINUX: .cfi_adjust_cfa_offset 4
; LINUX: pushl $1
; LINUX: .cfi_adjust_cfa_offset 4
; LINUX: calll good
; LINUX: addl $28, %esp
; LINUX: .cfi_adjust_cfa_offset -28
; LINUX-NOT: add
; LINUX: retl
define void @pr27140() optsize {
entry:
tail call void @good(i32 1, i32 2, i32 3, i32 4)
ret void
}
; Check that a stack restore (leal -4(%ebp), %esp) doesn't get merged with a
; stack adjustment (addl $12, %esp). Just because it's a lea doesn't mean it's
; simply decreasing the stack pointer.
; NORMAL-LABEL: test14:
; NORMAL: calll _B_func
; NORMAL: leal -4(%ebp), %esp
; NORMAL-NOT: %esp
; NORMAL: retl
%struct.A = type { i32, i32 }
%struct.B = type { i8 }
declare x86_thiscallcc %struct.B* @B_ctor(%struct.B* returned, %struct.A* byval)
declare void @B_func(%struct.B* sret, %struct.B*, i32)
define void @test14(%struct.A* %a) {
entry:
%ref.tmp = alloca %struct.B, align 1
%agg.tmp = alloca i64, align 4
%tmpcast = bitcast i64* %agg.tmp to %struct.A*
%tmp = alloca %struct.B, align 1
%0 = bitcast %struct.A* %a to i64*
%1 = load i64, i64* %0, align 4
store i64 %1, i64* %agg.tmp, align 4
%call = call x86_thiscallcc %struct.B* @B_ctor(%struct.B* %ref.tmp, %struct.A* byval %tmpcast)
%2 = getelementptr inbounds %struct.B, %struct.B* %tmp, i32 0, i32 0
call void @B_func(%struct.B* sret %tmp, %struct.B* %ref.tmp, i32 1)
ret void
}
; NORMAL-LABEL: pr34863_16
; NORMAL: movl 4(%esp), %eax
; NORMAL-NEXT: pushl $65535
; NORMAL-NEXT: pushl $0
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: calll _eightparams16
; NORMAL-NEXT: addl $32, %esp
;
; NOPUSH-LABEL: pr34863_16
; NOPUSH: subl $32, %esp
; NOPUSH-NEXT: movl 36(%esp), %eax
; NOPUSH-NEXT: movl %eax, 20(%esp)
; NOPUSH-NEXT: movl %eax, 16(%esp)
; NOPUSH-NEXT: movl %eax, 12(%esp)
; NOPUSH-NEXT: movl %eax, 8(%esp)
; NOPUSH-NEXT: movl %eax, 4(%esp)
; NOPUSH-NEXT: movl %eax, (%esp)
; NOPUSH-NEXT: movl $65535, 28(%esp)
; NOPUSH-NEXT: andl $0, 24(%esp)
; NOPUSH-NEXT: calll _eightparams16
; NOPUSH-NEXT: addl $32, %esp
define void @pr34863_16(i16 %x) minsize nounwind {
entry:
tail call void @eightparams16(i16 %x, i16 %x, i16 %x, i16 %x, i16 %x, i16 %x, i16 0, i16 -1)
ret void
}
; NORMAL-LABEL: pr34863_32
; NORMAL: movl 4(%esp), %eax
; NORMAL-NEXT: pushl $-1
; NORMAL-NEXT: pushl $0
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: calll _eightparams
; NORMAL-NEXT: addl $32, %esp
;
; NOPUSH-LABEL: pr34863_32
; NOPUSH: subl $32, %esp
; NOPUSH-NEXT: movl 36(%esp), %eax
; NOPUSH-NEXT: movl %eax, 20(%esp)
; NOPUSH-NEXT: movl %eax, 16(%esp)
; NOPUSH-NEXT: movl %eax, 12(%esp)
; NOPUSH-NEXT: movl %eax, 8(%esp)
; NOPUSH-NEXT: movl %eax, 4(%esp)
; NOPUSH-NEXT: movl %eax, (%esp)
; NOPUSH-NEXT: orl $-1, 28(%esp)
; NOPUSH-NEXT: andl $0, 24(%esp)
; NOPUSH-NEXT: calll _eightparams
; NOPUSH-NEXT: addl $32, %esp
define void @pr34863_32(i32 %x) minsize nounwind {
entry:
tail call void @eightparams(i32 %x, i32 %x, i32 %x, i32 %x, i32 %x, i32 %x, i32 0, i32 -1)
ret void
}
; NORMAL-LABEL: pr34863_64
; NORMAL: movl 4(%esp), %eax
; NORMAL-NEXT: movl 8(%esp), %ecx
; NORMAL-NEXT: pushl $-1
; NORMAL-NEXT: pushl $-1
; NORMAL-NEXT: pushl $0
; NORMAL-NEXT: pushl $0
; NORMAL-NEXT: pushl %ecx
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %ecx
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %ecx
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %ecx
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %ecx
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: pushl %ecx
; NORMAL-NEXT: pushl %eax
; NORMAL-NEXT: calll _eightparams64
; NORMAL-NEXT: addl $64, %esp
;
; NOPUSH-LABEL: pr34863_64
; NOPUSH: subl $64, %esp
; NOPUSH-NEXT: movl 68(%esp), %eax
; NOPUSH-NEXT: movl 72(%esp), %ecx
; NOPUSH-NEXT: movl %ecx, 44(%esp)
; NOPUSH-NEXT: movl %eax, 40(%esp)
; NOPUSH-NEXT: movl %ecx, 36(%esp)
; NOPUSH-NEXT: movl %eax, 32(%esp)
; NOPUSH-NEXT: movl %ecx, 28(%esp)
; NOPUSH-NEXT: movl %eax, 24(%esp)
; NOPUSH-NEXT: movl %ecx, 20(%esp)
; NOPUSH-NEXT: movl %eax, 16(%esp)
; NOPUSH-NEXT: movl %ecx, 12(%esp)
; NOPUSH-NEXT: movl %eax, 8(%esp)
; NOPUSH-NEXT: movl %ecx, 4(%esp)
; NOPUSH-NEXT: movl %eax, (%esp)
; NOPUSH-NEXT: orl $-1, 60(%esp)
; NOPUSH-NEXT: orl $-1, 56(%esp)
; NOPUSH-NEXT: andl $0, 52(%esp)
; NOPUSH-NEXT: andl $0, 48(%esp)
; NOPUSH-NEXT: calll _eightparams64
; NOPUSH-NEXT: addl $64, %esp
define void @pr34863_64(i64 %x) minsize nounwind {
entry:
tail call void @eightparams64(i64 %x, i64 %x, i64 %x, i64 %x, i64 %x, i64 %x, i64 0, i64 -1)
ret void
}
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