cba70550cc
The "topological" sorting was behaving incorrectly in some cases: the exit of a loop could have a lower rank than a node in the loop. This causes issues when structurizing some patterns, and also codegen issues as we could generate BBs in the incorrect order in regard to the SPIR-V spec. Fixing this ordering alone broke other parts of the structurizer, which by luck worked. Had to fix those. Added more test cases, especially to test basic patterns. I also needed to tweak/disable some tests for 2 reasons: - SPIR-V now required reg2mem/mem2reg to run. Meaning dead stores are optimized away. Some tests require tweaks to avoid having the whole function removed. - Mem2Reg will generate variable & load/stores. This generates G_BITCAST in several cases. And there is currently something wrong we do with G_BITCAST which causes MIR verifier to complain. Until this is resolved, I disabled -verify-machineinstrs flag on those tests. --------- Signed-off-by: Nathan Gauër <brioche@google.com>
46 lines
1.4 KiB
LLVM
46 lines
1.4 KiB
LLVM
; RUN: llc -mtriple=spirv-unknown-vulkan-compute -O0 %s -o - | FileCheck %s --match-full-lines
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; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv-unknown-vulkan-compute %s -o - -filetype=obj | spirv-val %}
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target datalayout = "e-i64:64-v16:16-v24:32-v32:32-v48:64-v96:128-v192:256-v256:256-v512:512-v1024:1024-G1"
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target triple = "spirv-unknown-vulkan1.3-compute"
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define internal spir_func void @main() #1 {
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; CHECK: %[[#entry:]] = OpLabel
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; CHECK: OpBranch %[[#do_body:]]
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entry:
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%0 = call token @llvm.experimental.convergence.entry()
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%a = alloca i32, align 4
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br label %loop_body
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loop_body:
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br i1 true, label %left, label %right
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left:
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br i1 true, label %loop_exit, label %loop_continue
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right:
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br i1 true, label %loop_exit, label %loop_continue
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loop_continue:
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br label %loop_body
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loop_exit:
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%r = phi i32 [ 0, %left ], [ 1, %right ]
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store i32 %r, ptr %a, align 4
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ret void
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}
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declare token @llvm.experimental.convergence.entry() #0
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declare token @llvm.experimental.convergence.loop() #0
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attributes #0 = { convergent nocallback nofree nosync nounwind willreturn memory(none) }
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attributes #1 = { convergent noinline norecurse nounwind optnone "frame-pointer"="all" "no-trapping-math"="true" "stack-protector-buffer-size"="8" }
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!llvm.module.flags = !{!0, !1}
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!0 = !{i32 1, !"wchar_size", i32 4}
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!1 = !{i32 4, !"dx.disable_optimizations", i32 1}
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