88 lines
2.9 KiB
LLVM
88 lines
2.9 KiB
LLVM
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; RUN: llc -march=amdgcn -verify-machineinstrs -simplifycfg-require-and-preserve-domtree=1 < %s | FileCheck -enable-var-scope %s
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; Although it's modeled without any control flow in order to get better code
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; out of the structurizer, @llvm.amdgcn.kill actually ends the thread that calls
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; it with "true". In case it's called in a provably infinite loop, we still
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; need to successfully exit and export something, even if we can't know where
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; to jump to in the LLVM IR. Therefore we insert a null export ourselves in
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; this case right before the s_endpgm to avoid GPU hangs, which is what this
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; tests.
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; CHECK-LABEL: return_void
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; Make sure that we remove the done bit from the original export
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; CHECK: exp mrt0 v{{[0-9]+}}, v{{[0-9]+}}, v{{[0-9]+}}, v{{[0-9]+}} vm
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; CHECK: exp null off, off, off, off done vm
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; CHECK-NEXT: s_endpgm
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define amdgpu_ps void @return_void(float %0) #0 {
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main_body:
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%cmp = fcmp olt float %0, 1.000000e+01
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br i1 %cmp, label %end, label %loop
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loop:
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call void @llvm.amdgcn.kill(i1 false) #3
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br label %loop
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end:
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call void @llvm.amdgcn.exp.f32(i32 0, i32 15, float 0., float 0., float 0., float 1., i1 true, i1 true) #3
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ret void
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}
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; Check that we also remove the done bit from compressed exports correctly.
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; CHECK-LABEL: return_void_compr
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; CHECK: exp mrt0 v{{[0-9]+}}, off, v{{[0-9]+}}, off compr vm
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; CHECK: exp null off, off, off, off done vm
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; CHECK-NEXT: s_endpgm
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define amdgpu_ps void @return_void_compr(float %0) #0 {
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main_body:
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%cmp = fcmp olt float %0, 1.000000e+01
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br i1 %cmp, label %end, label %loop
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loop:
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call void @llvm.amdgcn.kill(i1 false) #3
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br label %loop
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end:
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call void @llvm.amdgcn.exp.compr.v2i16(i32 0, i32 5, <2 x i16> < i16 0, i16 0 >, <2 x i16> < i16 0, i16 0 >, i1 true, i1 true) #3
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ret void
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}
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; test the case where there's only a kill in an infinite loop
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; CHECK-LABEL: only_kill
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; CHECK: exp null off, off, off, off done vm
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; CHECK-NEXT: s_endpgm
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; SIInsertSkips inserts an extra null export here, but it should be harmless.
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; CHECK: exp null off, off, off, off done vm
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; CHECK-NEXT: s_endpgm
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define amdgpu_ps void @only_kill() #0 {
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main_body:
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br label %loop
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loop:
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call void @llvm.amdgcn.kill(i1 false) #3
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br label %loop
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}
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; Check that the epilog is the final block
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; CHECK-LABEL: return_nonvoid
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; CHECK: exp null off, off, off, off done vm
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; CHECK-NEXT: s_endpgm
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; CHECK-NEXT: BB{{[0-9]+}}_{{[0-9]+}}:
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define amdgpu_ps float @return_nonvoid(float %0) #0 {
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main_body:
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%cmp = fcmp olt float %0, 1.000000e+01
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br i1 %cmp, label %end, label %loop
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loop:
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call void @llvm.amdgcn.kill(i1 false) #3
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br label %loop
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end:
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ret float 0.
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}
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declare void @llvm.amdgcn.kill(i1) #0
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declare void @llvm.amdgcn.exp.f32(i32 immarg, i32 immarg, float, float, float, float, i1 immarg, i1 immarg) #0
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declare void @llvm.amdgcn.exp.compr.v2i16(i32 immarg, i32 immarg, <2 x i16>, <2 x i16>, i1 immarg, i1 immarg) #0
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attributes #0 = { nounwind }
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