1 ; RUN: llc < %s -march=x86-64 -mcpu=corei7 | FileCheck %s 2 ; PR1198 3 4 define i64 @foo(i64 %x, i64 %y) { 5 %tmp0 = zext i64 %x to i128 6 %tmp1 = zext i64 %y to i128 7 %tmp2 = mul i128 %tmp0, %tmp1 8 %tmp7 = zext i32 64 to i128 9 %tmp3 = lshr i128 %tmp2, %tmp7 10 %tmp4 = trunc i128 %tmp3 to i64 11 ret i64 %tmp4 12 } 13 14 ; <rdar://problem/14096009> superfluous multiply by high part of 15 ; zero-extended value. 16 ; CHECK: @mul1 17 ; CHECK-NOT: imulq 18 ; CHECK: mulq 19 ; CHECK-NOT: imulq 20 define i64 @mul1(i64 %n, i64* nocapture %z, i64* nocapture %x, i64 %y) { 21 entry: 22 %conv = zext i64 %y to i128 23 %cmp11 = icmp eq i64 %n, 0 24 br i1 %cmp11, label %for.end, label %for.body 25 26 for.body: ; preds = %entry, %for.body 27 %carry.013 = phi i64 [ %conv6, %for.body ], [ 0, %entry ] 28 %i.012 = phi i64 [ %inc, %for.body ], [ 0, %entry ] 29 %arrayidx = getelementptr inbounds i64, i64* %x, i64 %i.012 30 %0 = load i64, i64* %arrayidx, align 8 31 %conv2 = zext i64 %0 to i128 32 %mul = mul i128 %conv2, %conv 33 %conv3 = zext i64 %carry.013 to i128 34 %add = add i128 %mul, %conv3 35 %conv4 = trunc i128 %add to i64 36 %arrayidx5 = getelementptr inbounds i64, i64* %z, i64 %i.012 37 store i64 %conv4, i64* %arrayidx5, align 8 38 %shr = lshr i128 %add, 64 39 %conv6 = trunc i128 %shr to i64 40 %inc = add i64 %i.012, 1 41 %exitcond = icmp eq i64 %inc, %n 42 br i1 %exitcond, label %for.end, label %for.body 43 44 for.end: ; preds = %for.body, %entry 45 ret i64 0 46 } 47
