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https://github.com/c64scene-ar/llvm-6502.git
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0b04cf6e71
When the last instruction prior to a function epilogue is a call, we need to emit a nop so that the return address is not in the epilogue IP range. This is consistent with MSVC's behavior, and may be a workaround for a bug in the Win64 unwinder. Differential Revision: http://reviews.llvm.org/D4751 Patch by Vadim Chugunov! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214775 91177308-0d34-0410-b5e6-96231b3b80d8
66 lines
1.3 KiB
LLVM
66 lines
1.3 KiB
LLVM
; RUN: llc < %s -mtriple=x86_64-pc-mingw32 | FileCheck %s -check-prefix=WIN64
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declare void @bar()
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declare void @baz()
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declare i32 @personality(...)
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; Check for 'nop' between the last call and the epilogue.
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define void @foo1() {
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invoke void @bar()
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to label %normal
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unwind label %catch
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normal:
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ret void
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catch:
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%1 = landingpad { i8*, i32 } personality i32 (...)* @personality cleanup
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resume { i8*, i32 } %1
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}
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; WIN64-LABEL: foo1:
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; WIN64: .seh_proc foo1
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; WIN64: callq bar
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; WIN64: nop
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; WIN64: addq ${{[0-9]+}}, %rsp
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; WIN64: retq
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; Check for 'ud2' after noreturn call
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; WIN64: callq _Unwind_Resume
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; WIN64-NEXT: ud2
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; WIN64: .seh_endproc
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; Check it still works when blocks are reordered.
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@something = global i32 0
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define void @foo2(i1 zeroext %cond ) {
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br i1 %cond, label %a, label %b, !prof !0
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a:
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call void @bar()
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br label %done
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b:
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call void @baz()
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store i32 0, i32* @something
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br label %done
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done:
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ret void
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}
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!0 = metadata !{metadata !"branch_weights", i32 100, i32 0}
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; WIN64-LABEL: foo2:
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; WIN64: callq bar
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; WIN64: nop
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; WIN64: addq ${{[0-9]+}}, %rsp
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; WIN64: retq
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; Check nop is not emitted when call is not adjacent to epilogue.
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define i32 @foo3() {
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call void @bar()
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ret i32 0
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}
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; WIN64-LABEL: foo3:
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; WIN64: callq bar
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; WIN64: xorl
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; WIN64-NOT: nop
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; WIN64: addq ${{[0-9]+}}, %rsp
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; WIN64: retq
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