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8a74c287ae
This is a (last big?) part of the patch series to make SimplifyCFG
preserve DomTree. Currently, it still does not actually preserve it,
even thought it is pretty much fully updated to preserve it.
Once the default is flipped, a valid DomTree must be passed into
simplifyCFG, which means that whatever pass calls simplifyCFG,
should also be smart about DomTree's.
As far as i can see from `check-llvm` with default flipped,
this is the last LLVM test batch (other than bugpoint tests)
that needed fixes to not break with default flipped.
The changes here are boringly identical to the ones i did
over 42+ times/commits recently already,
so while AMDGPU is outside of my normal ecosystem,
i'm going to go for post-commit review here,
like in all the other 42+ changes.
Note that while the pass is taught to preserve {,Post}DomTree,
it still doesn't do that by default, because simplifycfg
still doesn't do that by default, and flipping default
in this pass will implicitly flip the default for simplifycfg.
That will happen, but not right now.
88 lines
2.9 KiB
LLVM
88 lines
2.9 KiB
LLVM
; 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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