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https://github.com/c64scene-ar/llvm-6502.git
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d16918f843
Rewrite the DeadArgumentElimination pass, to use a more explicit tracking of dependencies between return values and/or arguments. Also make the handling of arguments and return values the same. The pass now looks properly inside returned structs, but only at the first level (ie, not inside nested structs). This version fixed a few more bugs and was cleaned up a bit. It now passes all of LLVM's testing, and should still pass SPEC2006. There is still a minor bug with regard to returning nested structs. Since there is currently nothing that emits such IR, I will fix that in a seperate commit (partly because it requires a non-trivial fix). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53400 91177308-0d34-0410-b5e6-96231b3b80d8
56 lines
2.1 KiB
LLVM
56 lines
2.1 KiB
LLVM
; This test sees if return values (and arguments) are properly removed when they
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; are unused. All unused values are typed i16, so we can easily check. We also
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; run instcombine to fold insert/extractvalue chains and we run dce to clean up
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; any remaining dead stuff.
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; RUN: llvm-as < %s | opt -deadargelim -instcombine -dce | llvm-dis | not grep i16
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define internal {i16, i32} @test(i16 %DEADARG) {
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%A = insertvalue {i16,i32} undef, i16 1, 0
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%B = insertvalue {i16,i32} %A, i32 1001, 1
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ret {i16,i32} %B
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}
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define internal {i32, i16} @test2() {
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%DEAD = call i16 @test4()
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%A = insertvalue {i32,i16} undef, i32 1, 0
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%B = insertvalue {i32,i16} %A, i16 %DEAD, 1
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ret {i32,i16} %B
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}
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; Dead argument, used to check if the second result of test2 is dead even when
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; it's used as a dead argument
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define internal i32 @test3(i16 %A) {
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%ret = call {i16, i32} @test( i16 %A ) ; <i32> [#uses=0]
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%DEAD = extractvalue {i16, i32} %ret, 0
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%LIVE = extractvalue {i16, i32} %ret, 1
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ret i32 %LIVE
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}
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define internal i16 @test4() {
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ret i16 0
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}
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; Multiple return values, multiple live return values
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define internal {i32, i32, i16} @test5() {
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%A = insertvalue {i32,i32,i16} undef, i32 1, 0
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%B = insertvalue {i32,i32,i16} %A, i32 2, 1
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%C = insertvalue {i32,i32,i16} %B, i16 3, 2
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ret {i32, i32, i16} %C
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}
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define i32 @main() {
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%ret = call {i32, i16} @test2() ; <i32> [#uses=1]
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%LIVE = extractvalue {i32, i16} %ret, 0
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%DEAD = extractvalue {i32, i16} %ret, 1
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%Y = add i32 %LIVE, -123 ; <i32> [#uses=1]
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%LIVE2 = call i32 @test3(i16 %DEAD) ; <i32> [#uses=1]
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%Z = add i32 %LIVE2, %Y ; <i32> [#uses=1]
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%ret1 = call { i32, i32, i16 } @test5 ()
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%LIVE3 = extractvalue { i32, i32, i16} %ret1, 0
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%LIVE4 = extractvalue { i32, i32, i16} %ret1, 1
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%DEAD2 = extractvalue { i32, i32, i16} %ret1, 2
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%V = add i32 %LIVE3, %LIVE4
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%W = add i32 %Z, %V
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ret i32 %W
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}
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