derek.holloway
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90 lines
3.9 KiB
YAML
90 lines
3.9 KiB
YAML
# RUN: llc -mtriple=amdgcn -mcpu=gfx1010 -mattr=+wavefrontsize64 -run-pass=si-optimize-exec-masking -verify-machineinstrs %s -o - | FileCheck --check-prefixes=GCN,GFX1010 %s
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# RUN: llc -mtriple=amdgcn -mcpu=gfx1030 -mattr=+wavefrontsize64 -run-pass=si-optimize-exec-masking -verify-machineinstrs %s -o - | FileCheck --check-prefixes=GCN,GFX1030 %s
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---
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# After the Optimize exec masking (post-RA) pass, there's a change of having v_cmpx instructions
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# being introduced whenever there's a sequence of v_cmp and s_and_saveexec instructions
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# which can be safely replaced in various cases.
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# However, it is not safe to do so when the generated code sequence would omit part of the EXEC mask
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# which could occur when a subset of EXEC is used as input operand in the v_cmp instruction.
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# The idea behind this test is to check if the subregisters are correctly handled here.
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# GCN-LABEL: name: vcmp_saveexec_to_mov_vcmpx_exec_subreg
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# GCN: V_CMP_GT_U32_e64
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# GCN: S_AND_SAVEEXEC_B64
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name: vcmp_saveexec_to_mov_vcmpx_exec_subreg
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $vgpr0, $sgpr2
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renamable $sgpr0_sgpr1 = V_CMP_GT_U32_e64 $sgpr2, killed $vgpr0, implicit $exec
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$sgpr2_sgpr3 = COPY $exec, implicit-def $exec
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$sgpr2_sgpr3 = S_AND_B64 killed renamable $sgpr2_sgpr3, killed renamable $sgpr0_sgpr1, implicit-def dead $scc
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$exec = S_MOV_B64_term killed renamable $sgpr2_sgpr3
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...
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---
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# Ensure the transformation does not get applied when the v_cmp target is used before the s_and_saveexec instruction.
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# GCN-LABEL: name: vcmp_saveexec_to_mov_vcmpx_exec_intermediate_use
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# GCN: V_CMP_LT_F32_e64
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# GCN: V_WRITELANE_B32
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# GCN: S_AND_SAVEEXEC_B64
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name: vcmp_saveexec_to_mov_vcmpx_exec_intermediate_use
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $vgpr0, $vgpr1, $sgpr2
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renamable $sgpr0_sgpr1 = V_CMP_LT_F32_e64 0, 953267991, 2, $vgpr1, 0, implicit $mode, implicit $exec
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$vgpr0 = V_WRITELANE_B32 0, $sgpr0, $vgpr0
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$sgpr2_sgpr3 = COPY $exec, implicit-def $exec
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$sgpr2_sgpr3 = S_AND_B64 killed renamable $sgpr2_sgpr3, killed renamable $sgpr0_sgpr1, implicit-def dead $scc
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$exec = S_MOV_B64_term killed renamable $sgpr2_sgpr3
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...
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---
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# Check if the modifiers are preserved when generating the V_CMPX instruction.
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# GCN-LABEL: name: vcmp_saveexec_to_mov_vcmpx_check_abs
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# GFX1010: V_CMP_LT_F32_e64
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# GFX1010: S_AND_SAVEEXEC_B64
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# GFX1030: S_MOV_B64
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# GFX1030-NEXT: V_CMPX_LT_F32_nosdst_e64 0, 953267991, 2
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name: vcmp_saveexec_to_mov_vcmpx_check_abs
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $vgpr0
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renamable $sgpr0_sgpr1 = V_CMP_LT_F32_e64 0, 953267991, 2, $vgpr0, 0, implicit $mode, implicit $exec
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$sgpr2_sgpr3 = COPY $exec, implicit-def $exec
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$sgpr2_sgpr3 = S_AND_B64 killed renamable $sgpr2_sgpr3, killed renamable $sgpr0_sgpr1, implicit-def dead $scc
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$exec = S_MOV_B64_term killed renamable $sgpr2_sgpr3
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...
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---
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# Check if the sequence will be optimized even with more than 5 (unrelated) instructions inbetween the v_cmp and s_and_saveexec.
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# GCN-LABEL: name: vcmp_saveexec_to_mov_vcmpx_check_many_instrs
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# GFX1010: V_CMP_LT_F32_e64
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# GFX1010: S_AND_SAVEEXEC_B64
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# GFX1030: S_MOV_B64
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# GFX1030: V_CMPX_LT_F32_nosdst_e64 0, 953267991, 2
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name: vcmp_saveexec_to_mov_vcmpx_check_many_instrs
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $vgpr0, $sgpr2, $vgpr1
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renamable $sgpr0_sgpr1 = V_CMP_LT_F32_e64 0, 953267991, 2, $vgpr0, 0, implicit $mode, implicit $exec
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$vgpr1 = V_WRITELANE_B32 0, $sgpr2, $vgpr1
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$vgpr1 = V_WRITELANE_B32 0, $sgpr2, $vgpr1
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$vgpr1 = V_WRITELANE_B32 0, $sgpr2, $vgpr1
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$vgpr1 = V_WRITELANE_B32 0, $sgpr2, $vgpr1
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$vgpr1 = V_WRITELANE_B32 0, $sgpr2, $vgpr1
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$vgpr1 = V_WRITELANE_B32 0, $sgpr2, $vgpr1
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$sgpr2_sgpr3 = COPY $exec, implicit-def $exec
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$sgpr2_sgpr3 = S_AND_B64 killed renamable $sgpr2_sgpr3, killed renamable $sgpr0_sgpr1, implicit-def dead $scc
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$exec = S_MOV_B64_term killed renamable $sgpr2_sgpr3
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