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dd292a30dc
Detailed description:
After https://reviews.llvm.org/D59990 submit several issues were discovered.
Changes in common code were preserved but AMDGPU specific part was reverted to keep the backend working correctly.
Discovered issues were addressed in the following commits:
https://reviews.llvm.org/D67662
https://reviews.llvm.org/D67101
https://reviews.llvm.org/D63953
https://reviews.llvm.org/D63731
This change brings back AMDGPU specific changes.
Reviewed by: rampitec, arsenm
Differential Revision: https://reviews.llvm.org/D68635
llvm-svn: 374767
69 lines
1.7 KiB
LLVM
69 lines
1.7 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_u32_e32 vcc, 0
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; CHECK: s_and_saveexec_b64
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; CHECK-NEXT: ; mask branch
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; CHECK-NEXT: s_cbranch_execz BB{{[0-9]+_[0-9]+}}
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; CHECK: [[LOOP_BODY_LABEL:BB[0-9]+_[0-9]+]]: ; %loop_body
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; CHECK: s_cbranch_scc0 [[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: ; mask branch
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; CHECK-NEXT: s_cbranch_execz
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define amdgpu_kernel 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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