330 lines
9.0 KiB
LLVM
330 lines
9.0 KiB
LLVM
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; RUN: llc -mtriple=x86_64-apple-darwin10.6 < %s | FileCheck %s
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; RUN: llc -mtriple=x86_64-linux < %s | FileCheck %s --check-prefix=NOCOMPACTUNWIND
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;
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; Note: This test cannot be merged with the shrink-wrapping tests
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; because the booleans set on the command line take precedence on
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; the target logic that disable shrink-wrapping.
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; The current compact unwind scheme does not work when the prologue is not at
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; the start (the instructions before the prologue cannot be described).
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; Currently we choose to not perform shrink-wrapping for functions without FP
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; not marked as nounwind. PR25614
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;
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; No shrink-wrapping should occur here, until the CFI information are fixed.
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; CHECK-LABEL: framelessUnwind:
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;
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; Prologue code.
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; (What we push does not matter. It should be some random sratch register.)
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; CHECK: pushq
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;
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; Compare the arguments and jump to exit.
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; After the prologue is set.
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; CHECK: movl %edi, [[ARG0CPY:%e[a-z]+]]
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; CHECK-NEXT: cmpl %esi, %edi
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; CHECK-NEXT: jge [[EXIT_LABEL:LBB[0-9_]+]]
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;
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; Store %a in the alloca.
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; CHECK: movl [[ARG0CPY]], 4(%rsp)
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; Set the alloca address in the second argument.
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; CHECK-NEXT: leaq 4(%rsp), %rsi
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; Set the first argument to zero.
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; CHECK-NEXT: xorl %edi, %edi
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; CHECK-NEXT: callq _doSomething
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;
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; CHECK: [[EXIT_LABEL]]:
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;
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; Without shrink-wrapping, epilogue is in the exit block.
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; Epilogue code. (What we pop does not matter.)
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; CHECK-NEXT: popq
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;
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; CHECK-NEXT: retq
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; On a platform which does not support compact unwind, shrink wrapping is enabled.
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; NOCOMPACTUNWIND-LABEL: framelessUnwind:
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; NOCOMPACTUNWIND-NOT: pushq
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; NOCOMPACTUNWIND: # %bb.1:
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; NOCOMPACTUNWIND-NEXT: pushq %rax
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define i32 @framelessUnwind(i32 %a, i32 %b) #0 {
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%tmp = alloca i32, align 4
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%tmp2 = icmp slt i32 %a, %b
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br i1 %tmp2, label %true, label %false
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true:
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store i32 %a, i32* %tmp, align 4
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%tmp4 = call i32 @doSomething(i32 0, i32* %tmp)
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br label %false
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false:
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%tmp.0 = phi i32 [ %tmp4, %true ], [ %a, %0 ]
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ret i32 %tmp.0
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}
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declare i32 @doSomething(i32, i32*)
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attributes #0 = { "frame-pointer"="none" }
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; Shrink-wrapping should occur here. We have a frame pointer.
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; CHECK-LABEL: frameUnwind:
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;
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; Compare the arguments and jump to exit.
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; No prologue needed.
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;
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; Compare the arguments and jump to exit.
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; After the prologue is set.
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; CHECK: movl %edi, [[ARG0CPY:%e[a-z]+]]
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; CHECK-NEXT: cmpl %esi, %edi
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; CHECK-NEXT: jge [[EXIT_LABEL:LBB[0-9_]+]]
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;
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; Prologue code.
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; CHECK: pushq %rbp
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; CHECK: movq %rsp, %rbp
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;
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; Store %a in the alloca.
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; CHECK: movl [[ARG0CPY]], -4(%rbp)
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; Set the alloca address in the second argument.
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; CHECK-NEXT: leaq -4(%rbp), %rsi
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; Set the first argument to zero.
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; CHECK-NEXT: xorl %edi, %edi
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; CHECK-NEXT: callq _doSomething
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;
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; Epilogue code. (What we pop does not matter.)
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; CHECK: popq %rbp
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;
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; CHECK: [[EXIT_LABEL]]:
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; CHECK-NEXT: retq
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define i32 @frameUnwind(i32 %a, i32 %b) #1 {
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%tmp = alloca i32, align 4
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%tmp2 = icmp slt i32 %a, %b
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br i1 %tmp2, label %true, label %false
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true:
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store i32 %a, i32* %tmp, align 4
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%tmp4 = call i32 @doSomething(i32 0, i32* %tmp)
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br label %false
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false:
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%tmp.0 = phi i32 [ %tmp4, %true ], [ %a, %0 ]
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ret i32 %tmp.0
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}
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attributes #1 = { "frame-pointer"="all" }
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; Shrink-wrapping should occur here. We do not have to unwind.
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; CHECK-LABEL: framelessnoUnwind:
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;
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; Compare the arguments and jump to exit.
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; No prologue needed.
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;
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; Compare the arguments and jump to exit.
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; After the prologue is set.
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; CHECK: movl %edi, [[ARG0CPY:%e[a-z]+]]
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; CHECK-NEXT: cmpl %esi, %edi
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; CHECK-NEXT: jge [[EXIT_LABEL:LBB[0-9_]+]]
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;
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; Prologue code.
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; (What we push does not matter. It should be some random sratch register.)
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; CHECK: pushq
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;
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; Store %a in the alloca.
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; CHECK: movl [[ARG0CPY]], 4(%rsp)
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; Set the alloca address in the second argument.
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; CHECK-NEXT: leaq 4(%rsp), %rsi
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; Set the first argument to zero.
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; CHECK-NEXT: xorl %edi, %edi
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; CHECK-NEXT: callq _doSomething
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;
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; Epilogue code.
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; CHECK-NEXT: addq
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;
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; CHECK: [[EXIT_LABEL]]:
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; CHECK-NEXT: retq
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define i32 @framelessnoUnwind(i32 %a, i32 %b) #2 {
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%tmp = alloca i32, align 4
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%tmp2 = icmp slt i32 %a, %b
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br i1 %tmp2, label %true, label %false
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true:
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store i32 %a, i32* %tmp, align 4
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%tmp4 = call i32 @doSomething(i32 0, i32* %tmp)
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br label %false
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false:
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%tmp.0 = phi i32 [ %tmp4, %true ], [ %a, %0 ]
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ret i32 %tmp.0
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}
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attributes #2 = { "frame-pointer"="none" nounwind }
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; Check that we generate correct code for segmented stack.
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; We used to emit the code at the entry point of the function
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; instead of just before the prologue.
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; For now, shrink-wrapping is disabled on segmented stack functions: PR26107.
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;
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; CHECK-LABEL: segmentedStack:
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; CHECK: cmpq
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; CHECK-NEXT: jbe [[ENTRY_LABEL:LBB[0-9_]+]]
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;
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; In PR26107, we use to drop these two basic blocks, because
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; the segmentedStack entry block was jumping directly to
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; the place where the prologue is actually needed, which is
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; the call to memcmp.
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; Then, those two basic blocks did not have any predecessors
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; anymore and were removed.
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;
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; Check if vk1 is null
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; CHECK: testq %rdi, %rdi
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; CHECK-NEXT: je [[STRINGS_EQUAL:LBB[0-9_]+]]
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;
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; Check if vk2 is null
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; CHECK: testq %rsi, %rsi
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; CHECK-NEXT: je [[STRINGS_EQUAL]]
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;
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; CHECK: [[STRINGS_EQUAL]]
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; CHECK: popq
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;
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; CHECK: [[ENTRY_LABEL]]:
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; CHECK: callq ___morestack
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; CHECK-NEXT: retq
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;
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define zeroext i1 @segmentedStack(i8* readonly %vk1, i8* readonly %vk2, i64 %key_size) #5 {
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entry:
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%cmp.i = icmp eq i8* %vk1, null
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%cmp1.i = icmp eq i8* %vk2, null
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%brmerge.i = or i1 %cmp.i, %cmp1.i
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%cmp1.mux.i = and i1 %cmp.i, %cmp1.i
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br i1 %brmerge.i, label %__go_ptr_strings_equal.exit, label %if.end4.i
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if.end4.i: ; preds = %entry
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%tmp = getelementptr inbounds i8, i8* %vk1, i64 8
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%tmp1 = bitcast i8* %tmp to i64*
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%tmp2 = load i64, i64* %tmp1, align 8
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%tmp3 = getelementptr inbounds i8, i8* %vk2, i64 8
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%tmp4 = bitcast i8* %tmp3 to i64*
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%tmp5 = load i64, i64* %tmp4, align 8
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%cmp.i.i = icmp eq i64 %tmp2, %tmp5
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br i1 %cmp.i.i, label %land.rhs.i.i, label %__go_ptr_strings_equal.exit
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land.rhs.i.i: ; preds = %if.end4.i
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%tmp6 = bitcast i8* %vk2 to i8**
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%tmp7 = load i8*, i8** %tmp6, align 8
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%tmp8 = bitcast i8* %vk1 to i8**
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%tmp9 = load i8*, i8** %tmp8, align 8
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%call.i.i = tail call i32 @memcmp(i8* %tmp9, i8* %tmp7, i64 %tmp2) #5
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%cmp4.i.i = icmp eq i32 %call.i.i, 0
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br label %__go_ptr_strings_equal.exit
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__go_ptr_strings_equal.exit: ; preds = %land.rhs.i.i, %if.end4.i, %entry
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%retval.0.i = phi i1 [ %cmp1.mux.i, %entry ], [ false, %if.end4.i ], [ %cmp4.i.i, %land.rhs.i.i ]
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ret i1 %retval.0.i
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}
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; Function Attrs: nounwind readonly
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declare i32 @memcmp(i8* nocapture, i8* nocapture, i64) #5
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attributes #5 = { nounwind readonly ssp uwtable "split-stack" }
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; Check that correctly take into account the jumps to landing pad.
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; We used to consider function that may throw like regular
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; function calls.
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; Therefore, in this example, we were happily inserting the epilogue
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; right after the call to throw_exception. Because of that we would not
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; execute the epilogue when an execption occur and bad things will
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; happen.
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; PR36513
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;
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; CHECK-LABEL: with_nounwind:
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; Prologue
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; CHECK: push
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;
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; Jump to throw_exception:
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; CHECK-NEXT: .cfi_def_cfa_offset
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; CHECK-NEXT: testb $1, %dil
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; CHECK-NEXT: jne [[THROW_LABEL:LBB[0-9_]+]]
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; Else return exit
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; CHECK: popq
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; CHECK-NEXT: retq
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;
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; CHECK-NEXT: [[THROW_LABEL]]:
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; CHECK: callq _throw_exception
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; Unreachable block...
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;
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; Epilogue must be after the landing pad.
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; CHECK-NOT: popq
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;
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; Look for the landing pad label.
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; CHECK: LBB{{[0-9_]+}}:
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; Epilogue on the landing pad
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; CHECK: popq
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; CHECK-NEXT: retq
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define void @with_nounwind(i1 %cond) nounwind personality i32 (...)* @my_personality {
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entry:
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br i1 %cond, label %throw, label %return
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throw:
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invoke void @throw_exception()
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to label %unreachable unwind label %landing
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unreachable:
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unreachable
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landing:
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%pad = landingpad { i8*, i32 }
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catch i8* null
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ret void
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return:
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ret void
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}
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; Check landing pad again.
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; This time checks that we can shrink-wrap when the epilogue does not
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; span accross several blocks.
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;
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; CHECK-LABEL: with_nounwind_same_succ:
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;
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; Jump to throw_exception:
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; CHECK: testb $1, %dil
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; CHECK-NEXT: je [[RET_LABEL:LBB[0-9_]+]]
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;
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; Prologue
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; CHECK: push
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; CHECK: callq _throw_exception
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;
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; Fallthrough label
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; CHECK: [[FALLTHROUGH_LABEL:LBB[0-9_]+]]
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; CHECK: nop
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; CHECK: popq
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;
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; CHECK: [[RET_LABEL]]
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; CHECK: retq
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;
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; Look for the landing pad label.
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; CHECK: LBB{{[0-9_]+}}:
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; Landing pad jumps to fallthrough
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; CHECK: jmp [[FALLTHROUGH_LABEL]]
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define void @with_nounwind_same_succ(i1 %cond) nounwind personality i32 (...)* @my_personality2 {
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entry:
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br i1 %cond, label %throw, label %return
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throw:
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invoke void @throw_exception()
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to label %fallthrough unwind label %landing
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landing:
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%pad = landingpad { i8*, i32 }
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catch i8* null
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br label %fallthrough
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fallthrough:
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tail call void asm "nop", ""()
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br label %return
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return:
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ret void
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}
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declare void @throw_exception()
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declare i32 @my_personality(...)
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declare i32 @my_personality2(...)
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