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1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py2; RUN: opt -S -passes=instcombine < %s | FileCheck %s3 4; This used to require 10 instcombine iterations to fully optimize.5; The number of iterations grew linearly with the number of DSEd stores,6; resulting in overall quadratic runtime.7 8%struct.S3 = type { i64 }9 10@csmith_sink_ = dso_local global i64 0, align 111@g_302_7 = internal constant i32 0, align 112@g_313_0 = internal global i16 0, align 113@g_313_1 = internal global i32 0, align 114@g_313_2 = internal global i32 0, align 115@g_313_3 = internal global i32 0, align 116@g_313_4 = internal global i16 0, align 117@g_313_5 = internal global i16 0, align 118@g_313_6 = internal global i16 0, align 119@g_316 = internal global %struct.S3 zeroinitializer, align 120@g_316_1_0 = internal global i16 0, align 121 22define i16 @main() {23; CHECK-LABEL: @main(24; CHECK-NEXT: entry:25; CHECK-NEXT: store i64 0, ptr @csmith_sink_, align 126; CHECK-NEXT: ret i16 027;28entry:29 store i64 0, ptr @csmith_sink_, align 130 %0 = load i16, ptr @g_313_0, align 131 %conv2 = sext i16 %0 to i6432 store i64 %conv2, ptr @csmith_sink_, align 133 %1 = load i32, ptr @g_313_1, align 134 %conv3 = zext i32 %1 to i6435 store i64 %conv3, ptr @csmith_sink_, align 136 %2 = load i32, ptr @g_313_2, align 137 %conv4 = sext i32 %2 to i6438 store i64 %conv4, ptr @csmith_sink_, align 139 %3 = load i32, ptr @g_313_3, align 140 %conv5 = zext i32 %3 to i6441 store i64 %conv5, ptr @csmith_sink_, align 142 %4 = load i16, ptr @g_313_4, align 143 %conv6 = sext i16 %4 to i6444 store i64 %conv6, ptr @csmith_sink_, align 145 %5 = load i16, ptr @g_313_5, align 146 %conv7 = sext i16 %5 to i6447 store i64 %conv7, ptr @csmith_sink_, align 148 %6 = load i16, ptr @g_313_6, align 149 %conv8 = sext i16 %6 to i6450 store i64 %conv8, ptr @csmith_sink_, align 151 %7 = load i64, ptr @g_316, align 152 store i64 %7, ptr @csmith_sink_, align 153 %8 = load i16, ptr @g_316_1_0, align 154 %conv9 = sext i16 %8 to i6455 store i64 %conv9, ptr @csmith_sink_, align 156 store i64 0, ptr @csmith_sink_, align 157 ret i16 058}59 60