60822637bf
This restores commit c7fdd8c11e54585dc9d15d63de9742067e0506b9. Previously reverted in f010b1bef4dda2c7082cbb41dbabf1f149cce306. LLVM function calls carry convergence control tokens as operand bundles, where the tokens themselves are produced by convergence control intrinsics. This patch implements convergence control tokens in MIR as follows: 1. Introduce target-independent ISD opcodes and MIR opcodes for convergence control intrinsics. 2. Model token values as untyped virtual registers in MIR. The change also introduces an additional ISD opcode CONVERGENCECTRL_GLUE and a corresponding machine opcode with the same spelling. This glues the convergence control token to SDNodes that represent calls to intrinsics. The glued token is later translated to an implicit argument in the MIR. The lowering of calls to user-defined functions is target-specific. On AMDGPU, the convergence control operand bundle at a non-intrinsic call is translated to an explicit argument to the SI_CALL_ISEL instruction. Post-selection adjustment converts this explicit argument to an implicit argument on the SI_CALL instruction.
38 lines
1.5 KiB
YAML
38 lines
1.5 KiB
YAML
# RUN: not --crash llc -march=amdgcn -run-pass=none -verify-machineinstrs -o /dev/null %s 2>&1 | FileCheck %s
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---
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name: basic
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tracksRegLiveness: true
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body: |
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bb.0:
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successors: %bb.1, %bb.2;
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%0:sgpr_64 = CONVERGENCECTRL_ANCHOR
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; CHECK: Entry intrinsic cannot be preceded by a convergent operation in the same basic block.
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; CHECK: CONVERGENCECTRL_ENTRY
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%1:sgpr_64 = CONVERGENCECTRL_ENTRY
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; CHECK: Loop intrinsic cannot be preceded by a convergent operation in the same basic block.
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; CHECK: CONVERGENCECTRL_LOOP
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%2:sgpr_64 = CONVERGENCECTRL_LOOP %0:sgpr_64
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S_CBRANCH_EXECZ %bb.1, implicit $exec
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S_BRANCH %bb.2
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bb.1:
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successors: %bb.2;
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; CHECK: Entry intrinsic can occur only in the entry block.
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; CHECK: CONVERGENCECTRL_ENTRY
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%5:sgpr_64 = CONVERGENCECTRL_ENTRY
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bb.2:
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; CHECK: Convergence control tokens can only be used by convergent operations.
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; CHECK: G_PHI
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%6:sgpr_64 = G_PHI %0:sgpr_64, %bb.0, %0:sgpr_64, %bb.1
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%7:sgpr_64 = CONVERGENCECTRL_ANCHOR
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%8:sgpr_64 = IMPLICIT_DEF
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%4:sgpr_64 = SI_CALL %8:sgpr_64, 1, implicit %7:sgpr_64
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; CHECK: An operation can use at most one convergence control token.
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; CHECK: SI_CALL %{{[0-9]}}:sgpr_64, 2
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%9:sgpr_64 = SI_CALL %8:sgpr_64, 2, implicit %7:sgpr_64, implicit %7:sgpr_64
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; CHECK: Cannot mix controlled and uncontrolled convergence in the same function.
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; CHECK: SI_CALL %{{[0-9]}}:sgpr_64, 3
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%10:sgpr_64 = SI_CALL %8:sgpr_64, 3
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...
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