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https://github.com/c64scene-ar/llvm-6502.git
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02518140ac
work and how to replace them into individual values. Also, when trying to replace an aggregrate that is used by load or store with a single (large) integer, don't crash (but don't replace the aggregrate either). Also adds a testcase for both structs and arrays. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51997 91177308-0d34-0410-b5e6-96231b3b80d8
33 lines
1.4 KiB
LLVM
33 lines
1.4 KiB
LLVM
; This test shows an alloca of a struct and an array that can be reduced to
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; multiple variables easily. However, the alloca is used by a store
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; instruction, which was not possible before aggregrates were first class
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; values. This checks of scalarrepl splits up the struct and array properly.
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; RUN: llvm-as < %s | opt -scalarrepl | llvm-dis | not grep alloca
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define i32 @foo() {
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%target = alloca { i32, i32 } ; <{ i32, i32 }*> [#uses=1]
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; Build a first class struct to store
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%res1 = insertvalue { i32, i32 } undef, i32 1, 0 ; <{ i32, i32 }> [#uses=1]
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%res2 = insertvalue { i32, i32 } %res1, i32 2, 1 ; <{ i32, i32 }> [#uses=1]
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; And store it
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store { i32, i32 } %res2, { i32, i32 }* %target
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; Actually use %target, so it doesn't get removed alltogether
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%ptr = getelementptr { i32, i32 }* %target, i32 0, i32 0
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%val = load i32* %ptr
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ret i32 %val
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}
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define i32 @bar() {
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%target = alloca [ 2 x i32 ] ; <{ i32, i32 }*> [#uses=1]
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; Build a first class array to store
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%res1 = insertvalue [ 2 x i32 ] undef, i32 1, 0 ; <{ i32, i32 }> [#uses=1]
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%res2 = insertvalue [ 2 x i32 ] %res1, i32 2, 1 ; <{ i32, i32 }> [#uses=1]
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; And store it
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store [ 2 x i32 ] %res2, [ 2 x i32 ]* %target
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; Actually use %target, so it doesn't get removed alltogether
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%ptr = getelementptr [ 2 x i32 ]* %target, i32 0, i32 0
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%val = load i32* %ptr
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ret i32 %val
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}
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