hoist-cond.ll
1.74 KB
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; RUN: llc -march=amdgcn -verify-machineinstrs -disable-block-placement < %s | FileCheck %s
; Check that invariant compare is hoisted out of the loop.
; At the same time condition shall not be serialized into a VGPR and deserialized later
; using another v_cmp + v_cndmask, but used directly in s_and_saveexec_b64.
; CHECK: v_cmp_{{..}}_u32_e{{32|64}} [[COND:s\[[0-9]+:[0-9]+\]|vcc]]
; CHECK: BB0_1:
; CHECK-NOT: v_cmp
; CHECK_NOT: v_cndmask
; CHECK: s_and_saveexec_b64 s[{{[[0-9]+:[0-9]+}}], [[COND]]
; CHECK: ; %bb.2:
define amdgpu_kernel void @hoist_cond(float addrspace(1)* nocapture %arg, float addrspace(1)* noalias nocapture readonly %arg1, i32 %arg3, i32 %arg4) {
bb:
%tmp = tail call i32 @llvm.amdgcn.workitem.id.x() #0
%tmp5 = icmp ult i32 %tmp, %arg3
br label %bb1
bb1: ; preds = %bb3, %bb
%tmp7 = phi i32 [ %arg4, %bb ], [ %tmp16, %bb3 ]
%tmp8 = phi float [ 0.000000e+00, %bb ], [ %tmp15, %bb3 ]
br i1 %tmp5, label %bb2, label %bb3
bb2: ; preds = %bb1
%tmp10 = zext i32 %tmp7 to i64
%tmp11 = getelementptr inbounds float, float addrspace(1)* %arg1, i64 %tmp10
%tmp12 = load float, float addrspace(1)* %tmp11, align 4
br label %bb3
bb3: ; preds = %bb2, %bb1
%tmp14 = phi float [ %tmp12, %bb2 ], [ 0.000000e+00, %bb1 ]
%tmp15 = fadd float %tmp8, %tmp14
%tmp16 = add i32 %tmp7, -1
%tmp17 = icmp eq i32 %tmp16, 0
br i1 %tmp17, label %bb4, label %bb1
bb4: ; preds = %bb3
store float %tmp15, float addrspace(1)* %arg, align 4
ret void
}
; Function Attrs: nounwind readnone
declare i32 @llvm.amdgcn.workitem.id.x() #0
attributes #0 = { nounwind readnone }