| ; RUN: opt < %s -indvars -S | FileCheck %s |
| |
| target triple = "nvptx64-unknown-unknown" |
| |
| ; For the nvptx64 architecture, the cost of an arithmetic instruction on a |
| ; 64-bit integer is twice as expensive as that on a 32-bit integer, because the |
| ; hardware needs to simulate a 64-bit integer using two 32-bit integers. |
| ; Therefore, in this particular architecture, we should not widen induction |
| ; variables to 64-bit integers even though i64 is a legal type in the 64-bit |
| ; PTX ISA. |
| |
| define void @indvar_32_bit(i32 %n, i32* nocapture %output) { |
| ; CHECK-LABEL: @indvar_32_bit |
| entry: |
| %cmp5 = icmp sgt i32 %n, 0 |
| br i1 %cmp5, label %for.body.preheader, label %for.end |
| |
| for.body.preheader: ; preds = %entry |
| br label %for.body |
| |
| for.body: ; preds = %for.body.preheader, %for.body |
| %i.06 = phi i32 [ 0, %for.body.preheader ], [ %add, %for.body ] |
| ; CHECK: phi i32 |
| %mul = mul nsw i32 %i.06, %i.06 |
| %0 = sext i32 %i.06 to i64 |
| %arrayidx = getelementptr inbounds i32, i32* %output, i64 %0 |
| store i32 %mul, i32* %arrayidx, align 4 |
| %add = add nsw i32 %i.06, 3 |
| %cmp = icmp slt i32 %add, %n |
| br i1 %cmp, label %for.body, label %for.end.loopexit |
| |
| for.end.loopexit: ; preds = %for.body |
| br label %for.end |
| |
| for.end: ; preds = %for.end.loopexit, %entry |
| ret void |
| } |