mirror of
https://github.com/RPCS3/llvm.git
synced 2026-01-31 01:25:19 +01:00
8cec6c4916
Reland r317100 with minor fix regarding ComputeCommonTailLength function in BranchFolding.cpp. Skipping top CFI instructions block needs to executed on several more return points in ComputeCommonTailLength(). Original r317100 message: "Correct dwarf unwind information in function epilogue for X86" 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 - 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. Changed CFI instructions so that they: - are duplicable - are not counted as instructions when tail duplicating or tail merging - can be compared as equal Added CFIInstrInserter pass: - analyzes each basic block to determine cfa offset and register 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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317579 91177308-0d34-0410-b5e6-96231b3b80d8
196 lines
9.0 KiB
LLVM
196 lines
9.0 KiB
LLVM
; RUN: llc -verify-machineinstrs < %s 2>&1 | FileCheck %s
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target triple = "x86_64-pc-linux-gnu"
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declare void @"some_call"(i64 addrspace(1)*)
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declare i64 addrspace(1)* @"some_other_call"(i64 addrspace(1)*)
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declare i32 @"personality_function"()
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define i64 addrspace(1)* @test_basic(i64 addrspace(1)* %obj,
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i64 addrspace(1)* %obj1)
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gc "statepoint-example" personality i32 ()* @"personality_function" {
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entry:
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; CHECK: Ltmp{{[0-9]+}}:
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; CHECK: callq some_call
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; CHECK: Ltmp{{[0-9]+}}:
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%0 = invoke token (i64, i32, void (i64 addrspace(1)*)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidp1i64f(i64 0, i32 0, void (i64 addrspace(1)*)* @some_call, i32 1, i32 0, i64 addrspace(1)* %obj, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0, i64 addrspace(1)* %obj, i64 addrspace(1)* %obj1)
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to label %invoke_safepoint_normal_dest unwind label %exceptional_return
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invoke_safepoint_normal_dest:
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; CHECK: movq
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%obj.relocated = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %0, i32 13, i32 13)
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%obj1.relocated = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %0, i32 14, i32 14)
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br label %normal_return
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normal_return:
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; CHECK: retq
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ret i64 addrspace(1)* %obj.relocated
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exceptional_return:
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; CHECK: Ltmp{{[0-9]+}}:
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; CHECK: movq
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; CHECK: retq
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%landing_pad = landingpad token
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cleanup
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%obj.relocated1 = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %landing_pad, i32 13, i32 13)
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%obj1.relocated1 = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %landing_pad, i32 14, i32 14)
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ret i64 addrspace(1)* %obj1.relocated1
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}
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; CHECK-LABEL: GCC_except_table{{[0-9]+}}:
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; CHECK: .long .Ltmp{{[0-9]+}}-.Ltmp{{[0-9]+}}
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; CHECK: .long .Ltmp{{[0-9]+}}-.Lfunc_begin{{[0-9]+}}
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; CHECK: .byte 0
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; CHECK: .p2align 4
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define i64 addrspace(1)* @test_result(i64 addrspace(1)* %obj,
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i64 addrspace(1)* %obj1)
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gc "statepoint-example" personality i32 ()* @personality_function {
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entry:
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; CHECK: .Ltmp{{[0-9]+}}:
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; CHECK: callq some_other_call
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; CHECK: .Ltmp{{[0-9]+}}:
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%0 = invoke token (i64, i32, i64 addrspace(1)* (i64 addrspace(1)*)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_p1i64p1i64f(i64 0, i32 0, i64 addrspace(1)* (i64 addrspace(1)*)* @some_other_call, i32 1, i32 0, i64 addrspace(1)* %obj, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0, i64 addrspace(1)* %obj, i64 addrspace(1)* %obj1)
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to label %normal_return unwind label %exceptional_return
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normal_return:
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; CHECK: popq
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; CHECK: retq
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%ret_val = call i64 addrspace(1)* @llvm.experimental.gc.result.p1i64(token %0)
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ret i64 addrspace(1)* %ret_val
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exceptional_return:
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; CHECK: .Ltmp{{[0-9]+}}:
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; CHECK: movq
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%landing_pad = landingpad token
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cleanup
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%obj.relocated = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %landing_pad, i32 13, i32 13)
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ret i64 addrspace(1)* %obj.relocated
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}
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; CHECK-LABEL: GCC_except_table{{[0-9]+}}:
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; CHECK: .long .Ltmp{{[0-9]+}}-.Ltmp{{[0-9]+}}
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; CHECK: .long .Ltmp{{[0-9]+}}-.Lfunc_begin{{[0-9]+}}
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; CHECK: .byte 0
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; CHECK: .p2align 4
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define i64 addrspace(1)* @test_same_val(i1 %cond, i64 addrspace(1)* %val1, i64 addrspace(1)* %val2, i64 addrspace(1)* %val3)
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gc "statepoint-example" personality i32 ()* @"personality_function" {
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entry:
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br i1 %cond, label %left, label %right
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left:
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; CHECK-LABEL: %left
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; CHECK: movq %rdx, 8(%rsp)
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; CHECK: movq
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; CHECK: callq some_call
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%sp1 = invoke token (i64, i32, void (i64 addrspace(1)*)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidp1i64f(i64 0, i32 0, void (i64 addrspace(1)*)* @some_call, i32 1, i32 0, i64 addrspace(1)* %val1, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0, i64 addrspace(1)* %val1, i64 addrspace(1)* %val2)
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to label %left.relocs unwind label %exceptional_return.left
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left.relocs:
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; CHECK: movq (%rsp),
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; CHECK: movq 8(%rsp), [[REGVAL2:%[a-z]+]]
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%val1.relocated = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %sp1, i32 13, i32 13)
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%val2.relocated_left = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %sp1, i32 14, i32 14)
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br label %normal_return
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right:
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; CHECK-LABEL: %right
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; CHECK: movq %rdx, (%rsp)
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; CHECK: movq
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; CHECK: callq some_call
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%sp2 = invoke token (i64, i32, void (i64 addrspace(1)*)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidp1i64f(i64 0, i32 0, void (i64 addrspace(1)*)* @some_call, i32 1, i32 0, i64 addrspace(1)* %val1, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0, i64 addrspace(1)* %val2, i64 addrspace(1)* %val3)
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to label %right.relocs unwind label %exceptional_return.right
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right.relocs:
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; CHECK: movq (%rsp), [[REGVAL2]]
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; CHECK: movq
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%val2.relocated_right = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %sp2, i32 13, i32 13)
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%val3.relocated = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %sp2, i32 14, i32 14)
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br label %normal_return
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normal_return:
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; CHECK-LABEL: %normal_return
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; CHECK: cmoveq {{.*}}[[REGVAL2]]{{.*}}
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; CHECK: retq
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%a1 = phi i64 addrspace(1)* [%val1.relocated, %left.relocs], [%val3.relocated, %right.relocs]
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%a2 = phi i64 addrspace(1)* [%val2.relocated_left, %left.relocs], [%val2.relocated_right, %right.relocs]
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%ret = select i1 %cond, i64 addrspace(1)* %a1, i64 addrspace(1)* %a2
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ret i64 addrspace(1)* %ret
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exceptional_return.left:
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%landing_pad = landingpad token
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cleanup
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%val.relocated2 = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %landing_pad, i32 13, i32 13)
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ret i64 addrspace(1)* %val.relocated2
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exceptional_return.right:
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%landing_pad1 = landingpad token
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cleanup
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%val.relocated3 = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %landing_pad1, i32 13, i32 13)
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ret i64 addrspace(1)* %val.relocated3
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}
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define i64 addrspace(1)* @test_null_undef(i64 addrspace(1)* %val1)
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gc "statepoint-example" personality i32 ()* @"personality_function" {
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; CHECK-LABEL: test_null_undef:
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entry:
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; CHECK: callq some_call
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%sp1 = invoke token (i64, i32, void (i64 addrspace(1)*)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidp1i64f(i64 0, i32 0, void (i64 addrspace(1)*)* @some_call, i32 1, i32 0, i64 addrspace(1)* %val1, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0, i64 addrspace(1)* null, i64 addrspace(1)* undef)
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to label %normal_return unwind label %exceptional_return
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normal_return:
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; CHECK-LABEL: %normal_return
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; CHECK: xorl %eax, %eax
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; CHECK-NEXT: popq
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: retq
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%null.relocated = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %sp1, i32 13, i32 13)
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%undef.relocated = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %sp1, i32 14, i32 14)
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ret i64 addrspace(1)* %null.relocated
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exceptional_return:
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%landing_pad = landingpad token
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cleanup
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%null.relocated2 = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %landing_pad, i32 13, i32 13)
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%undef.relocated2 = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %landing_pad, i32 14, i32 14)
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ret i64 addrspace(1)* %null.relocated2
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}
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define i64 addrspace(1)* @test_alloca_and_const(i64 addrspace(1)* %val1)
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gc "statepoint-example" personality i32 ()* @"personality_function" {
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; CHECK-LABEL: test_alloca_and_const:
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entry:
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%a = alloca i32
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%aa = addrspacecast i32* %a to i32 addrspace(1)*
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%c = inttoptr i64 15 to i64 addrspace(1)*
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; CHECK: callq
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%sp = invoke token (i64, i32, void (i64 addrspace(1)*)*, i32, i32, ...) @llvm.experimental.gc.statepoint.p0f_isVoidp1i64f(i64 0, i32 0, void (i64 addrspace(1)*)* @some_call, i32 1, i32 0, i64 addrspace(1)* %val1, i32 0, i32 5, i32 0, i32 -1, i32 0, i32 0, i32 0, i32 addrspace(1)* %aa, i64 addrspace(1)* %c)
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to label %normal_return unwind label %exceptional_return
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normal_return:
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; CHECK: leaq
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; CHECK-NEXT: popq
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: retq
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%aa.rel = call coldcc i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(token %sp, i32 13, i32 13)
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%aa.converted = bitcast i32 addrspace(1)* %aa.rel to i64 addrspace(1)*
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ret i64 addrspace(1)* %aa.converted
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exceptional_return:
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; CHECK: movl $15
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; CHECK-NEXT: popq
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; CHECK-NEXT: .cfi_def_cfa_offset 8
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; CHECK-NEXT: retq
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%landing_pad = landingpad token
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cleanup
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%aa.rel2 = call coldcc i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token %landing_pad, i32 14, i32 14)
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ret i64 addrspace(1)* %aa.rel2
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}
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declare token @llvm.experimental.gc.statepoint.p0f_isVoidp1i64f(i64, i32, void (i64 addrspace(1)*)*, i32, i32, ...)
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declare token @llvm.experimental.gc.statepoint.p0f_p1i64p1i64f(i64, i32, i64 addrspace(1)* (i64 addrspace(1)*)*, i32, i32, ...)
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declare i64 addrspace(1)* @llvm.experimental.gc.relocate.p1i64(token, i32, i32)
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declare i32 addrspace(1)* @llvm.experimental.gc.relocate.p1i32(token, i32, i32)
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declare i64 addrspace(1)* @llvm.experimental.gc.result.p1i64(token)
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