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4a544a79bd
init.trampoline and adjust.trampoline intrinsics, into two intrinsics like in GCC. While having one combined intrinsic is tempting, it is not natural because typically the trampoline initialization needs to be done in one function, and the result of adjust trampoline is needed in a different (nested) function. To get around this llvm-gcc hacks the nested function lowering code to insert an additional parent variable holding the adjust.trampoline result that can be accessed from the child function. Dragonegg doesn't have the luxury of tweaking GCC code, so it stored the result of adjust.trampoline in the memory GCC set aside for the trampoline itself (this is always available in the child function), and set up some new memory (using an alloca) to hold the trampoline. Unfortunately this breaks Go which allocates trampoline memory on the heap and wants to use it even after the parent has exited (!). Rather than doing even more hacks to get Go working, it seemed best to just use two intrinsics like in GCC. Patch mostly by Sanjoy Das. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139140 91177308-0d34-0410-b5e6-96231b3b80d8
27 lines
1.3 KiB
LLVM
27 lines
1.3 KiB
LLVM
; RUN: opt < %s -instcombine -S | grep zeroext
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%struct.FRAME.nest = type { i32, i32 (...)* }
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%struct.__builtin_trampoline = type { [10 x i8] }
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declare void @llvm.init.trampoline(i8*, i8*, i8*) nounwind
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declare i8* @llvm.adjust.trampoline(i8*) nounwind
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declare i32 @f(%struct.FRAME.nest* nest , ...)
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define i32 @nest(i32 %n) {
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entry:
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%FRAME.0 = alloca %struct.FRAME.nest, align 8 ; <%struct.FRAME.nest*> [#uses=3]
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%TRAMP.216 = alloca [10 x i8], align 16 ; <[10 x i8]*> [#uses=1]
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%TRAMP.216.sub = getelementptr [10 x i8]* %TRAMP.216, i32 0, i32 0 ; <i8*> [#uses=1]
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%tmp3 = getelementptr %struct.FRAME.nest* %FRAME.0, i32 0, i32 0 ; <i32*> [#uses=1]
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store i32 %n, i32* %tmp3, align 8
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%FRAME.06 = bitcast %struct.FRAME.nest* %FRAME.0 to i8* ; <i8*> [#uses=1]
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call void @llvm.init.trampoline( i8* %TRAMP.216.sub, i8* bitcast (i32 (%struct.FRAME.nest*, ...)* @f to i8*), i8* %FRAME.06 ) ; <i8*> [#uses=1]
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%tramp = call i8* @llvm.adjust.trampoline( i8* %TRAMP.216.sub)
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%tmp7 = getelementptr %struct.FRAME.nest* %FRAME.0, i32 0, i32 1 ; <i32 (...)**> [#uses=1]
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%tmp89 = bitcast i8* %tramp to i32 (...)* ; <i32 (...)*> [#uses=2]
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store i32 (...)* %tmp89, i32 (...)** %tmp7, align 8
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%tmp2.i = call i32 (...)* %tmp89( i32 zeroext 0 ) ; <i32> [#uses=1]
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ret i32 %tmp2.i
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}
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