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llvm/test/CodeGen/X86/win32-seh-catchpad.ll
Hans Wennborg b667d698ac [X86] Enable call frame optimization ("mov to push") not only for optsize (PR26325) 
The size savings are significant, and from what I can tell, both ICC and GCC do this.

Differential Revision: http://reviews.llvm.org/D18573

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264966 91177308-0d34-0410-b5e6-96231b3b80d8
2016-03-30 23:38:01 +00:00

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LLVM
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; RUN: llc < %s | FileCheck %s
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
target triple = "i686-pc-windows-msvc"
define void @try_except() #0 personality i8* bitcast (i32 (...)* @_except_handler3 to i8*) {
entry:
%__exception_code = alloca i32, align 4
call void (...) @llvm.localescape(i32* %__exception_code)
invoke void @f(i32 1) #3
to label %invoke.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%cs1 = catchswitch within none [label %__except.ret] unwind to caller
__except.ret: ; preds = %catch.dispatch
%0 = catchpad within %cs1 [i8* bitcast (i32 ()* @try_except_filter_catchall to i8*)]
catchret from %0 to label %__except
__except: ; preds = %__except.ret
call void @f(i32 2)
br label %__try.cont
__try.cont: ; preds = %__except, %invoke.cont
call void @f(i32 3)
ret void
invoke.cont: ; preds = %entry
br label %__try.cont
}
; CHECK-LABEL: _try_except:
; Store state #0
; CHECK: movl $0, -[[state:[0-9]+]](%ebp)
; CHECK: pushl $1
; CHECK: calll _f
; CHECK: movl $-1, -[[state]](%ebp)
; CHECK: pushl $3
; CHECK: calll _f
; CHECK: retl
; __except
; CHECK: movl $-1, -[[state]](%ebp)
; CHECK: pushl $2
; CHECK: calll _f
; CHECK: .section .xdata,"dr"
; CHECK: L__ehtable$try_except:
; CHECK: .long -1 # ToState
; CHECK: .long _try_except_filter_catchall # Filter
; CHECK: .long LBB0_1
define internal i32 @try_except_filter_catchall() #0 {
entry:
%0 = call i8* @llvm.frameaddress(i32 1)
%1 = call i8* @llvm.x86.seh.recoverfp(i8* bitcast (void ()* @try_except to i8*), i8* %0)
%2 = call i8* @llvm.localrecover(i8* bitcast (void ()* @try_except to i8*), i8* %1, i32 0)
%__exception_code = bitcast i8* %2 to i32*
%3 = getelementptr inbounds i8, i8* %0, i32 -20
%4 = bitcast i8* %3 to i8**
%5 = load i8*, i8** %4, align 4
%6 = bitcast i8* %5 to { i32*, i8* }*
%7 = getelementptr inbounds { i32*, i8* }, { i32*, i8* }* %6, i32 0, i32 0
%8 = load i32*, i32** %7, align 4
%9 = load i32, i32* %8, align 4
store i32 %9, i32* %__exception_code, align 4
ret i32 1
}
define void @nested_exceptions() #0 personality i8* bitcast (i32 (...)* @_except_handler3 to i8*) {
entry:
%__exception_code = alloca i32, align 4
call void (...) @llvm.localescape(i32* %__exception_code)
invoke void @crash() #3
to label %__try.cont unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%cs1 = catchswitch within none [label %__except.ret] unwind label %catch.dispatch.11
__except.ret: ; preds = %catch.dispatch
%0 = catchpad within %cs1 [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)]
catchret from %0 to label %__try.cont
__try.cont: ; preds = %entry, %__except.ret
invoke void @crash() #3
to label %__try.cont.9 unwind label %catch.dispatch.5
catch.dispatch.5: ; preds = %__try.cont
%cs2 = catchswitch within none [label %__except.ret.7] unwind label %catch.dispatch.11
__except.ret.7: ; preds = %catch.dispatch.5
%1 = catchpad within %cs2 [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)]
catchret from %1 to label %__try.cont.9
__try.cont.9: ; preds = %__try.cont, %__except.ret.7
invoke void @crash() #3
to label %__try.cont.15 unwind label %catch.dispatch.11
catch.dispatch.11: ; preds = %catchendblock, %catchendblock.6, %__try.cont.9
%cs3 = catchswitch within none [label %__except.ret.13] unwind label %catch.dispatch.17
__except.ret.13: ; preds = %catch.dispatch.11
%2 = catchpad within %cs3 [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)]
catchret from %2 to label %__try.cont.15
__try.cont.15: ; preds = %__try.cont.9, %__except.ret.13
invoke void @crash() #3
to label %__try.cont.35 unwind label %catch.dispatch.17
catch.dispatch.17: ; preds = %catchendblock.12, %__try.cont.15
%cs4 = catchswitch within none [label %__except.ret.19] unwind to caller
__except.ret.19: ; preds = %catch.dispatch.17
%3 = catchpad within %cs4 [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)]
catchret from %3 to label %__except.20
__except.20: ; preds = %__except.ret.19
invoke void @crash() #3
to label %__try.cont.27 unwind label %catch.dispatch.23
catch.dispatch.23: ; preds = %__except.20
%cs5 = catchswitch within none [label %__except.ret.25] unwind to caller
__except.ret.25: ; preds = %catch.dispatch.23
%4 = catchpad within %cs5 [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)]
catchret from %4 to label %__try.cont.27
__try.cont.27: ; preds = %__except.20, %__except.ret.25
invoke void @crash() #3
to label %__try.cont.35 unwind label %catch.dispatch.30
catch.dispatch.30: ; preds = %__try.cont.27
%cs6 = catchswitch within none [label %__except.ret.32] unwind to caller
__except.ret.32: ; preds = %catch.dispatch.30
%5 = catchpad within %cs6 [i8* bitcast (i32 ()* @nested_exceptions_filter_catchall to i8*)]
catchret from %5 to label %__try.cont.35
__try.cont.35: ; preds = %__try.cont.15, %__try.cont.27, %__except.ret.32
ret void
}
; This table is equivalent to the one produced by MSVC, even if it isn't in
; quite the same order.
; CHECK-LABEL: _nested_exceptions:
; CHECK: L__ehtable$nested_exceptions:
; CHECK: .long -1
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long 0
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long 1
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long 1
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long -1
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
; CHECK: .long -1
; CHECK: .long _nested_exceptions_filter_catchall
; CHECK: .long LBB
declare void @crash() #0
define internal i32 @nested_exceptions_filter_catchall() #0 {
entry:
%0 = call i8* @llvm.frameaddress(i32 1)
%1 = call i8* @llvm.x86.seh.recoverfp(i8* bitcast (void ()* @nested_exceptions to i8*), i8* %0)
%2 = call i8* @llvm.localrecover(i8* bitcast (void ()* @nested_exceptions to i8*), i8* %1, i32 0)
%__exception_code3 = bitcast i8* %2 to i32*
%3 = getelementptr inbounds i8, i8* %0, i32 -20
%4 = bitcast i8* %3 to i8**
%5 = load i8*, i8** %4, align 4
%6 = bitcast i8* %5 to { i32*, i8* }*
%7 = getelementptr inbounds { i32*, i8* }, { i32*, i8* }* %6, i32 0, i32 0
%8 = load i32*, i32** %7, align 4
%9 = load i32, i32* %8, align 4
store i32 %9, i32* %__exception_code3, align 4
ret i32 1
}
define void @code_in_catchpad() #0 personality i8* bitcast (i32 (...)* @_except_handler3 to i8*) {
entry:
invoke void @f(i32 1) #3
to label %__except unwind label %catch.dispatch
catch.dispatch: ; preds = %entry
%cs1 = catchswitch within none [label %__except.ret] unwind to caller
__except.ret: ; preds = %catch.dispatch
%0 = catchpad within %cs1 [i8* bitcast (i32 ()* @try_except_filter_catchall to i8*)]
call void @f(i32 2) [ "funclet"(token %0) ]
catchret from %0 to label %__except
__except:
ret void
}
; CHECK-LABEL: _code_in_catchpad:
; CHECK: # %__except.ret
; CHECK-NEXT: movl -24(%ebp), %esp
; CHECK-NEXT: addl $12, %ebp
; CHECK-NEXT: movl $-1, -16(%ebp)
; CHECK-NEXT: pushl $2
; CHECK-NEXT: calll _f
; Function Attrs: nounwind readnone
declare i8* @llvm.frameaddress(i32) #1
; Function Attrs: nounwind readnone
declare i8* @llvm.x86.seh.recoverfp(i8*, i8*) #1
; Function Attrs: nounwind readnone
declare i8* @llvm.localrecover(i8*, i8*, i32) #1
declare void @f(i32) #0
declare i32 @_except_handler3(...)
; Function Attrs: nounwind
declare void @llvm.localescape(...) #2
attributes #0 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone }
attributes #2 = { nounwind }
attributes #3 = { noinline }
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