; RUN: opt -S -mtriple=amdgcn-unknown-amdhsa -passes=indvars %s | FileCheck %s
; Bug 21148
; Induction variables should not be widened for 64-bit integers,
; despite being a legal type.
;
; The cost of basic arithmetic instructions on a 64-bit integer are
; twice as expensive as that on a 32-bit integer, or split into 2
; 32-bit components.
target datalayout = "e-p:64:64-p1:64:64-p2:32:32-p3:32:32-p4:64:64-p5:32:32-p6:32:32-p7:160:256:256:32-p8:128:128-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024-v2048:2048-n32:64-S32-A5"
; CHECK-LABEL: @indvar_32_bit(
; CHECK-NOT: sext i32
; CHECK: phi i32
define amdgpu_kernel void @indvar_32_bit(i32 %n, ptr nocapture %output) {
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 ]
%mul = mul nsw i32 %i.06, %i.06
%tmp0 = sext i32 %i.06 to i64
%arrayidx = getelementptr inbounds i32, ptr %output, i64 %tmp0
store i32 %mul, ptr %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
}
; CHECK-LABEL: @no_promote_i32(
; CHECK-NOT: sext i32
; CHECK: br
; CHECK-NOT: shl i64
; CHECK-NOT: ashr i64
; CHECK-NOT: mul nsw i64
; CHECK-NOT: add nsw i64
define amdgpu_kernel void @no_promote_i32(ptr addrspace(1) %out, i32 %a, i32 %b) {
entry:
br label %for.body
for.body:
%inc = phi i32 [ 0, %entry ], [ %inc.i, %for.body ]
%tmp0 = add i32 %a, %inc
%shl = shl i32 %inc, 8
%shr = ashr exact i32 %shl, 8
%mul = mul nsw i32 %shr, %a
%add = add nsw i32 %mul, %b
%tmp1 = sext i32 %add to i64
%arrayidx1 = getelementptr inbounds i32, ptr addrspace(1) %out, i64 %tmp1
store i32 %tmp0, ptr addrspace(1) %arrayidx1, align 4
%inc.i = add nsw i32 %inc, 1
%cmp = icmp slt i32 %inc.i, 16
br i1 %cmp, label %for.body, label %for.end
for.end:
ret void
}
; FIXME: This should really be promoted to i64, since it will need to
; be legalized anyway.
; CHECK-LABEL: @indvar_48_bit(
define amdgpu_kernel void @indvar_48_bit(i48 %n, ptr nocapture %output) {
entry:
%cmp5 = icmp sgt i48 %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 i48 [ 0, %for.body.preheader ], [ %add, %for.body ]
%mul = mul nsw i48 %i.06, %i.06
%tmp0 = sext i48 %i.06 to i64
%arrayidx = getelementptr inbounds i48, ptr %output, i64 %tmp0
store i48 %mul, ptr %arrayidx, align 4
%add = add nsw i48 %i.06, 3
%cmp = icmp slt i48 %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
}
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