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https://github.com/c64scene-ar/llvm-6502.git
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49ab3a626a
Today a simple function that only catches exceptions and doesn't run destructor cleanups ends up containing a dead call to _Unwind_Resume (PR20300). We can't remove these dead resume instructions during normal optimization because inlining might introduce additional landingpads that do have cleanups to run. Instead we can do this during EH preparation, which is guaranteed to run after inlining. Fixes PR20300. Reviewers: majnemer Differential Revision: http://reviews.llvm.org/D7744 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229944 91177308-0d34-0410-b5e6-96231b3b80d8
126 lines
3.1 KiB
LLVM
126 lines
3.1 KiB
LLVM
; RUN: llc < %s -march=xcore | FileCheck %s
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declare void @g()
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declare i32 @__gxx_personality_v0(...)
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declare i32 @llvm.eh.typeid.for(i8*) nounwind readnone
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declare i8* @__cxa_begin_catch(i8*)
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declare void @__cxa_end_catch()
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declare i8* @__cxa_allocate_exception(i32)
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declare void @__cxa_throw(i8*, i8*, i8*)
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@_ZTIi = external constant i8*
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@_ZTId = external constant i8*
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; CHECK-LABEL: fn_typeid:
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; CHECK: .cfi_startproc
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; CHECK: mkmsk r0, 1
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; CHECK: retsp 0
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; CHECK: .cfi_endproc
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define i32 @fn_typeid() {
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entry:
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%0 = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*)) nounwind
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ret i32 %0
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}
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; CHECK-LABEL: fn_throw
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; CHECK: .cfi_startproc
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; CHECK: entsp 1
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; CHECK: .cfi_def_cfa_offset 4
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; CHECK: .cfi_offset 15, 0
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; CHECK: ldc r0, 4
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; CHECK: bl __cxa_allocate_exception
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; CHECK: ldaw r1, dp[_ZTIi]
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; CHECK: ldc r2, 0
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; CHECK: bl __cxa_throw
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define void @fn_throw() {
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entry:
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%0 = call i8* @__cxa_allocate_exception(i32 4) nounwind
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call void @__cxa_throw(i8* %0, i8* bitcast (i8** @_ZTIi to i8*), i8* null) noreturn
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unreachable
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}
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; CHECK-LABEL: fn_catch
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; CHECK: .cfi_startproc
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; CHECK: .cfi_personality 0, __gxx_personality_v0
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; CHECK: [[START:.L[a-zA-Z0-9_]+]]
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; CHECK: .cfi_lsda 0, [[LSDA:.L[a-zA-Z0-9_]+]]
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; CHECK: entsp 4
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; CHECK: .cfi_def_cfa_offset 16
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; CHECK: .cfi_offset 15, 0
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define void @fn_catch() {
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entry:
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; N.B. we alloc no variables, hence force compiler to spill
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; CHECK: stw r4, sp[3]
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; CHECK: .cfi_offset 4, -4
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; CHECK: stw r5, sp[2]
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; CHECK: .cfi_offset 5, -8
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; CHECK: stw r6, sp[1]
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; CHECK: .cfi_offset 6, -12
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; CHECK: [[PRE_G:.L[a-zA-Z0-9_]+]]
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; CHECK: bl g
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; CHECK: [[POST_G:.L[a-zA-Z0-9_]+]]
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; CHECK: [[RETURN:.L[a-zA-Z0-9_]+]]
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; CHECK: ldw r6, sp[1]
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; CHECK: ldw r5, sp[2]
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; CHECK: ldw r4, sp[3]
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; CHECK: retsp 4
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invoke void @g() to label %cont unwind label %lpad
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cont:
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ret void
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; CHECK: {{.L[a-zA-Z0-9_]+}}
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; CHECK: [[LANDING:.L[a-zA-Z0-9_]+]]
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; CHECK: mov r5, r1
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; CHECK: mov r4, r0
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; CHECK: bl __cxa_begin_catch
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; CHECK: ldw r6, r0[0]
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; CHECK: bl __cxa_end_catch
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lpad:
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%0 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
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cleanup
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catch i8* bitcast (i8** @_ZTIi to i8*)
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catch i8* bitcast (i8** @_ZTId to i8*)
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%1 = extractvalue { i8*, i32 } %0, 0
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%2 = extractvalue { i8*, i32 } %0, 1
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%3 = call i8* @__cxa_begin_catch(i8* %1) nounwind
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%4 = bitcast i8* %3 to i32*
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%5 = load i32* %4
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call void @__cxa_end_catch() nounwind
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; CHECK: eq r0, r6, r5
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; CHECK: bf r0, [[RETURN]]
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; CHECK: mov r0, r4
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; CHECK: bl _Unwind_Resume
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; CHECK: .cfi_endproc
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; CHECK: [[END:.L[a-zA-Z0-9_]+]]
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%6 = icmp eq i32 %5, %2
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br i1 %6, label %Resume, label %Exit
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Resume:
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resume { i8*, i32 } %0
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Exit:
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ret void
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}
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; CHECK: [[LSDA]]:
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; CHECK: .byte 255
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; CHECK: .byte 0
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; CHECK: .asciiz
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; CHECK: .byte 3
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; CHECK: .byte 26
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; CHECK: .long [[PRE_G]]-[[START]]
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; CHECK: .long [[POST_G]]-[[PRE_G]]
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; CHECK: .long [[LANDING]]-[[START]]
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; CHECK: .byte 5
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; CHECK: .long [[POST_G]]-[[START]]
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; CHECK: .long [[END]]-[[POST_G]]
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; CHECK: .long 0
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; CHECK: .byte 0
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; CHECK: .byte 0
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; CHECK: .byte 1
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; CHECK: .byte 125
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; CHECK: .byte 2
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; CHECK: .byte 125
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; CHECK: .long _ZTIi
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; CHECK: .long _ZTId
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