| ; RUN: llc < %s -march=x86-64 -mcpu=corei7 | FileCheck %s |
| ; PR1198 |
| |
| define i64 @foo(i64 %x, i64 %y) { |
| %tmp0 = zext i64 %x to i128 |
| %tmp1 = zext i64 %y to i128 |
| %tmp2 = mul i128 %tmp0, %tmp1 |
| %tmp7 = zext i32 64 to i128 |
| %tmp3 = lshr i128 %tmp2, %tmp7 |
| %tmp4 = trunc i128 %tmp3 to i64 |
| ret i64 %tmp4 |
| } |
| |
| ; <rdar://problem/14096009> superfluous multiply by high part of |
| ; zero-extended value. |
| ; CHECK: @mul1 |
| ; CHECK-NOT: imulq |
| ; CHECK: mulq |
| ; CHECK-NOT: imulq |
| define i64 @mul1(i64 %n, i64* nocapture %z, i64* nocapture %x, i64 %y) { |
| entry: |
| %conv = zext i64 %y to i128 |
| %cmp11 = icmp eq i64 %n, 0 |
| br i1 %cmp11, label %for.end, label %for.body |
| |
| for.body: ; preds = %entry, %for.body |
| %carry.013 = phi i64 [ %conv6, %for.body ], [ 0, %entry ] |
| %i.012 = phi i64 [ %inc, %for.body ], [ 0, %entry ] |
| %arrayidx = getelementptr inbounds i64* %x, i64 %i.012 |
| %0 = load i64* %arrayidx, align 8 |
| %conv2 = zext i64 %0 to i128 |
| %mul = mul i128 %conv2, %conv |
| %conv3 = zext i64 %carry.013 to i128 |
| %add = add i128 %mul, %conv3 |
| %conv4 = trunc i128 %add to i64 |
| %arrayidx5 = getelementptr inbounds i64* %z, i64 %i.012 |
| store i64 %conv4, i64* %arrayidx5, align 8 |
| %shr = lshr i128 %add, 64 |
| %conv6 = trunc i128 %shr to i64 |
| %inc = add i64 %i.012, 1 |
| %exitcond = icmp eq i64 %inc, %n |
| br i1 %exitcond, label %for.end, label %for.body |
| |
| for.end: ; preds = %for.body, %entry |
| ret i64 0 |
| } |