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external/llvm/test/Transforms/DeadStoreElimination/inst-limits.ll
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261
external/llvm/test/Transforms/DeadStoreElimination/inst-limits.ll
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; RUN: opt -S -dse < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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; If there are two stores to the same location, DSE should be able to remove
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; the first store if the two stores are separated by no more than 98
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; instructions. The existence of debug intrinsics between the stores should
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; not affect this instruction limit.
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@x = global i32 0, align 4
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; Function Attrs: nounwind
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define i32 @test_within_limit() !dbg !4 {
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entry:
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; The first store; later there is a second store to the same location,
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; so this store should be optimized away by DSE.
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; CHECK-NOT: store i32 1, i32* @x, align 4
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store i32 1, i32* @x, align 4
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; Insert 98 dummy instructions between the two stores
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%0 = bitcast i32 0 to i32
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%1 = bitcast i32 0 to i32
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%2 = bitcast i32 0 to i32
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%3 = bitcast i32 0 to i32
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%4 = bitcast i32 0 to i32
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%5 = bitcast i32 0 to i32
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%6 = bitcast i32 0 to i32
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%7 = bitcast i32 0 to i32
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%8 = bitcast i32 0 to i32
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%9 = bitcast i32 0 to i32
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%10 = bitcast i32 0 to i32
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%11 = bitcast i32 0 to i32
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%12 = bitcast i32 0 to i32
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%13 = bitcast i32 0 to i32
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%14 = bitcast i32 0 to i32
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%15 = bitcast i32 0 to i32
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%16 = bitcast i32 0 to i32
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%17 = bitcast i32 0 to i32
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%18 = bitcast i32 0 to i32
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%19 = bitcast i32 0 to i32
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%20 = bitcast i32 0 to i32
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%21 = bitcast i32 0 to i32
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%22 = bitcast i32 0 to i32
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%23 = bitcast i32 0 to i32
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%24 = bitcast i32 0 to i32
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%25 = bitcast i32 0 to i32
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%26 = bitcast i32 0 to i32
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%27 = bitcast i32 0 to i32
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%28 = bitcast i32 0 to i32
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%29 = bitcast i32 0 to i32
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%30 = bitcast i32 0 to i32
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%31 = bitcast i32 0 to i32
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%32 = bitcast i32 0 to i32
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%33 = bitcast i32 0 to i32
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%34 = bitcast i32 0 to i32
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%35 = bitcast i32 0 to i32
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%36 = bitcast i32 0 to i32
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%37 = bitcast i32 0 to i32
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%38 = bitcast i32 0 to i32
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%39 = bitcast i32 0 to i32
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%40 = bitcast i32 0 to i32
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%41 = bitcast i32 0 to i32
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%42 = bitcast i32 0 to i32
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%43 = bitcast i32 0 to i32
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%44 = bitcast i32 0 to i32
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%45 = bitcast i32 0 to i32
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%46 = bitcast i32 0 to i32
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%47 = bitcast i32 0 to i32
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%48 = bitcast i32 0 to i32
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%49 = bitcast i32 0 to i32
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%50 = bitcast i32 0 to i32
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%51 = bitcast i32 0 to i32
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%52 = bitcast i32 0 to i32
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%53 = bitcast i32 0 to i32
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%54 = bitcast i32 0 to i32
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%55 = bitcast i32 0 to i32
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%56 = bitcast i32 0 to i32
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%57 = bitcast i32 0 to i32
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%58 = bitcast i32 0 to i32
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%59 = bitcast i32 0 to i32
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%60 = bitcast i32 0 to i32
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%61 = bitcast i32 0 to i32
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%62 = bitcast i32 0 to i32
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%63 = bitcast i32 0 to i32
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%64 = bitcast i32 0 to i32
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%65 = bitcast i32 0 to i32
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%66 = bitcast i32 0 to i32
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%67 = bitcast i32 0 to i32
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%68 = bitcast i32 0 to i32
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%69 = bitcast i32 0 to i32
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%70 = bitcast i32 0 to i32
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%71 = bitcast i32 0 to i32
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%72 = bitcast i32 0 to i32
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%73 = bitcast i32 0 to i32
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%74 = bitcast i32 0 to i32
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%75 = bitcast i32 0 to i32
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%76 = bitcast i32 0 to i32
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%77 = bitcast i32 0 to i32
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%78 = bitcast i32 0 to i32
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%79 = bitcast i32 0 to i32
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%80 = bitcast i32 0 to i32
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%81 = bitcast i32 0 to i32
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%82 = bitcast i32 0 to i32
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%83 = bitcast i32 0 to i32
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%84 = bitcast i32 0 to i32
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%85 = bitcast i32 0 to i32
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%86 = bitcast i32 0 to i32
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%87 = bitcast i32 0 to i32
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%88 = bitcast i32 0 to i32
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%89 = bitcast i32 0 to i32
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%90 = bitcast i32 0 to i32
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%91 = bitcast i32 0 to i32
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%92 = bitcast i32 0 to i32
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%93 = bitcast i32 0 to i32
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%94 = bitcast i32 0 to i32
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%95 = bitcast i32 0 to i32
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%96 = bitcast i32 0 to i32
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%97 = bitcast i32 0 to i32
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; Insert a meaningless dbg.value intrinsic; it should have no
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; effect on the working of DSE in any way.
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call void @llvm.dbg.value(metadata i32 undef, metadata !10, metadata !DIExpression()), !dbg !DILocation(scope: !4)
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; CHECK: store i32 -1, i32* @x, align 4
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store i32 -1, i32* @x, align 4
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ret i32 0
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}
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; Function Attrs: nounwind
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define i32 @test_outside_limit() {
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entry:
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; The first store; later there is a second store to the same location
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; CHECK: store i32 1, i32* @x, align 4
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store i32 1, i32* @x, align 4
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; Insert 99 dummy instructions between the two stores; this is
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; one too many instruction for the DSE to take place.
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%0 = bitcast i32 0 to i32
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%1 = bitcast i32 0 to i32
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%2 = bitcast i32 0 to i32
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%3 = bitcast i32 0 to i32
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%4 = bitcast i32 0 to i32
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%5 = bitcast i32 0 to i32
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%6 = bitcast i32 0 to i32
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%7 = bitcast i32 0 to i32
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%8 = bitcast i32 0 to i32
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%9 = bitcast i32 0 to i32
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%10 = bitcast i32 0 to i32
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%11 = bitcast i32 0 to i32
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%12 = bitcast i32 0 to i32
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%13 = bitcast i32 0 to i32
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%14 = bitcast i32 0 to i32
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%15 = bitcast i32 0 to i32
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%16 = bitcast i32 0 to i32
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%17 = bitcast i32 0 to i32
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%18 = bitcast i32 0 to i32
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%19 = bitcast i32 0 to i32
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%20 = bitcast i32 0 to i32
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%21 = bitcast i32 0 to i32
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%22 = bitcast i32 0 to i32
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%23 = bitcast i32 0 to i32
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%24 = bitcast i32 0 to i32
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%25 = bitcast i32 0 to i32
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%26 = bitcast i32 0 to i32
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%27 = bitcast i32 0 to i32
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%28 = bitcast i32 0 to i32
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%29 = bitcast i32 0 to i32
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%30 = bitcast i32 0 to i32
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%31 = bitcast i32 0 to i32
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%32 = bitcast i32 0 to i32
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%33 = bitcast i32 0 to i32
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%34 = bitcast i32 0 to i32
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%35 = bitcast i32 0 to i32
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%36 = bitcast i32 0 to i32
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%37 = bitcast i32 0 to i32
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%38 = bitcast i32 0 to i32
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%39 = bitcast i32 0 to i32
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%40 = bitcast i32 0 to i32
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%41 = bitcast i32 0 to i32
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%42 = bitcast i32 0 to i32
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%43 = bitcast i32 0 to i32
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%44 = bitcast i32 0 to i32
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%45 = bitcast i32 0 to i32
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%46 = bitcast i32 0 to i32
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%47 = bitcast i32 0 to i32
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%48 = bitcast i32 0 to i32
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%49 = bitcast i32 0 to i32
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%50 = bitcast i32 0 to i32
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%51 = bitcast i32 0 to i32
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%52 = bitcast i32 0 to i32
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%53 = bitcast i32 0 to i32
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%54 = bitcast i32 0 to i32
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%55 = bitcast i32 0 to i32
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%56 = bitcast i32 0 to i32
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%57 = bitcast i32 0 to i32
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%58 = bitcast i32 0 to i32
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%59 = bitcast i32 0 to i32
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%60 = bitcast i32 0 to i32
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%61 = bitcast i32 0 to i32
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%62 = bitcast i32 0 to i32
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%63 = bitcast i32 0 to i32
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%64 = bitcast i32 0 to i32
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%65 = bitcast i32 0 to i32
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%66 = bitcast i32 0 to i32
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%67 = bitcast i32 0 to i32
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%68 = bitcast i32 0 to i32
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%69 = bitcast i32 0 to i32
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%70 = bitcast i32 0 to i32
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%71 = bitcast i32 0 to i32
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%72 = bitcast i32 0 to i32
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%73 = bitcast i32 0 to i32
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%74 = bitcast i32 0 to i32
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%75 = bitcast i32 0 to i32
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%76 = bitcast i32 0 to i32
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%77 = bitcast i32 0 to i32
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%78 = bitcast i32 0 to i32
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%79 = bitcast i32 0 to i32
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%80 = bitcast i32 0 to i32
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%81 = bitcast i32 0 to i32
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%82 = bitcast i32 0 to i32
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%83 = bitcast i32 0 to i32
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%84 = bitcast i32 0 to i32
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%85 = bitcast i32 0 to i32
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%86 = bitcast i32 0 to i32
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%87 = bitcast i32 0 to i32
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%88 = bitcast i32 0 to i32
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%89 = bitcast i32 0 to i32
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%90 = bitcast i32 0 to i32
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%91 = bitcast i32 0 to i32
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%92 = bitcast i32 0 to i32
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%93 = bitcast i32 0 to i32
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%94 = bitcast i32 0 to i32
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%95 = bitcast i32 0 to i32
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%96 = bitcast i32 0 to i32
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%97 = bitcast i32 0 to i32
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%98 = bitcast i32 0 to i32
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; CHECK: store i32 -1, i32* @x, align 4
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store i32 -1, i32* @x, align 4
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ret i32 0
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!11, !13}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "test.c", directory: "/home/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "test_within_limit", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 4, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "test.c", directory: "/home/tmp")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !{!10}
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!10 = !DILocalVariable(name: "x", scope: !4, type: !8)
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!11 = !{i32 2, !"Dwarf Version", i32 4}
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!12 = !{i32* undef}
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!13 = !{i32 1, !"Debug Info Version", i32 3}
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