74 lines
1.8 KiB
LLVM
74 lines
1.8 KiB
LLVM
; RUN: llc -march=amdgcn -mcpu=verde < %s | FileCheck %s
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; Test a simple uniform loop that lives inside non-uniform control flow.
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; CHECK-LABEL: {{^}}test1:
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; CHECK: v_cmp_ne_i32_e32 vcc, 0
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; CHECK: s_and_saveexec_b64
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; CHECK-NEXT: s_xor_b64
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; CHECK-NEXT: ; mask branch
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; CHECK-NEXT: s_cbranch_execz
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; CHECK-NEXT: BB{{[0-9]+_[0-9]+}}: ; %loop_body.preheader
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; CHECK: [[LOOP_BODY_LABEL:BB[0-9]+_[0-9]+]]:
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; CHECK: s_and_b64 vcc, exec, vcc
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; CHECK: s_cbranch_vccz [[LOOP_BODY_LABEL]]
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; CHECK: s_endpgm
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define amdgpu_ps void @test1(<8 x i32> inreg %rsrc, <2 x i32> %addr.base, i32 %y, i32 %p) {
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main_body:
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%cc = icmp eq i32 %p, 0
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br i1 %cc, label %out, label %loop_body
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loop_body:
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%counter = phi i32 [ 0, %main_body ], [ %incr, %loop_body ]
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; Prevent the loop from being optimized out
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call void asm sideeffect "", "" ()
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%incr = add i32 %counter, 1
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%lc = icmp sge i32 %incr, 1000
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br i1 %lc, label %out, label %loop_body
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out:
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ret void
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}
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; CHECK-LABEL: {{^}}test2:
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; CHECK: s_and_saveexec_b64
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; CHECK-NEXT: s_xor_b64
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; CHECK-NEXT: ; mask branch
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; CHECK-NEXT: s_cbranch_execz
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define void @test2(i32 addrspace(1)* %out, i32 %a, i32 %b) {
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main_body:
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%tid = call i32 @llvm.amdgcn.workitem.id.x() #1
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%cc = icmp eq i32 %tid, 0
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br i1 %cc, label %done1, label %if
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if:
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%cmp = icmp eq i32 %a, 0
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br i1 %cmp, label %done0, label %loop_body
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loop_body:
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%counter = phi i32 [ 0, %if ], [0, %done0], [ %incr, %loop_body ]
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; Prevent the loop from being optimized out
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call void asm sideeffect "", "" ()
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%incr = add i32 %counter, 1
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%lc = icmp sge i32 %incr, 1000
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br i1 %lc, label %done1, label %loop_body
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done0:
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%cmp0 = icmp eq i32 %b, 0
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br i1 %cmp0, label %done1, label %loop_body
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done1:
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ret void
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}
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declare i32 @llvm.amdgcn.workitem.id.x() #1
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attributes #1 = { nounwind readonly }
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