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If an instruction had multiple subregister defs, and one of them was undef, this would improperly conclude all other lanes are killed. There could still be other defs of those read-undef lanes in other operands. This would improperly remove register uses from CurrentVRegUses, so the visitation of later operands would not find the necessary register dependency. This would also mean this would fail or not depending on how different subregister def operands were ordered. On an undef subregister def, scan the instruction for other subregister defs and avoid killing those. This possibly should be deferring removing anything from CurrentVRegUses until the entire instruction has been processed instead. llvm-svn: 372362
87 lines
3.5 KiB
YAML
87 lines
3.5 KiB
YAML
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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# RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx906 -verify-machineinstrs -run-pass=machine-scheduler -verify-misched -o - %s | FileCheck %s
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# Deciding which lanes are killed needs to account for other defs in the
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# instruction.
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#
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# addVRegDefDeps would encounter the %0.sub0 def and erase %0 from
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# current vreg uses because it shared no lanes with %0.sub1 use on the
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# nop. It then didn't see the lanemask when it reached the second
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# subreg def, and failed to add the necessary dependency between the
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# asm and S_NOP
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---
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name: no_live_subrange_at_use
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tracksRegLiveness: true
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machineFunctionInfo:
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isEntryFunction: true
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body: |
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; CHECK-LABEL: name: no_live_subrange_at_use
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; CHECK: bb.0:
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; CHECK: successors: %bb.1(0x80000000)
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; CHECK: undef %0.sub0:vreg_64 = V_MOV_B32_e32 0, implicit $exec
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; CHECK: %0.sub1:vreg_64 = V_MOV_B32_e32 0, implicit $exec
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; CHECK: [[V_MOV_B32_e32_:%[0-9]+]]:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
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; CHECK: bb.1:
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; CHECK: successors: %bb.1(0x80000000)
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; CHECK: [[DS_READ_B32_gfx9_:%[0-9]+]]:vgpr_32 = DS_READ_B32_gfx9 [[V_MOV_B32_e32_]], 0, 0, implicit $exec :: (load 4, addrspace 3)
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; CHECK: INLINEASM &"", 1, 851978, def %0, 2147549193, %0(tied-def 3)
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; CHECK: INLINEASM &"", 1, 851977, [[DS_READ_B32_gfx9_]]
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; CHECK: INLINEASM &"", 1, 851978, def undef %0.sub0, 851978, def undef %0.sub1
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; CHECK: S_NOP 0, implicit %0.sub1
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; CHECK: $sgpr10 = S_MOV_B32 -1
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; CHECK: S_BRANCH %bb.1
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bb.0:
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undef %0.sub0:vreg_64 = V_MOV_B32_e32 0, implicit $exec
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%0.sub1:vreg_64 = V_MOV_B32_e32 0, implicit $exec
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%1:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
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bb.1:
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%2:vgpr_32 = DS_READ_B32_gfx9 %1, 0, 0, implicit $exec :: (load 4, addrspace 3)
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INLINEASM &"", 1, 851978, def %0, 2147549193, %0(tied-def 3)
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INLINEASM &"", 1, 851977, %2
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INLINEASM &"", 1, 851978, def undef %0.sub0, 851978, def %0.sub1
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S_NOP 0, implicit %0.sub1
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$sgpr10 = S_MOV_B32 -1
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S_BRANCH %bb.1
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...
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# Different operand order
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---
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name: no_live_subrange_at_use_swap
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tracksRegLiveness: true
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machineFunctionInfo:
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isEntryFunction: true
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body: |
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; CHECK-LABEL: name: no_live_subrange_at_use_swap
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; CHECK: bb.0:
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; CHECK: successors: %bb.1(0x80000000)
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; CHECK: undef %0.sub0:vreg_64 = V_MOV_B32_e32 0, implicit $exec
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; CHECK: %0.sub1:vreg_64 = V_MOV_B32_e32 0, implicit $exec
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; CHECK: [[V_MOV_B32_e32_:%[0-9]+]]:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
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; CHECK: bb.1:
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; CHECK: successors: %bb.1(0x80000000)
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; CHECK: [[DS_READ_B32_gfx9_:%[0-9]+]]:vgpr_32 = DS_READ_B32_gfx9 [[V_MOV_B32_e32_]], 0, 0, implicit $exec :: (load 4, addrspace 3)
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; CHECK: INLINEASM &"", 1, 851978, def %0, 2147549193, %0(tied-def 3)
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; CHECK: INLINEASM &"", 1, 851977, [[DS_READ_B32_gfx9_]]
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; CHECK: INLINEASM &"", 1, 851978, def undef %0.sub1, 851978, def undef %0.sub0
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; CHECK: S_NOP 0, implicit %0.sub1
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; CHECK: $sgpr10 = S_MOV_B32 -1
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; CHECK: S_BRANCH %bb.1
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bb.0:
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undef %0.sub0:vreg_64 = V_MOV_B32_e32 0, implicit $exec
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%0.sub1:vreg_64 = V_MOV_B32_e32 0, implicit $exec
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%1:vgpr_32 = V_MOV_B32_e32 0, implicit $exec
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bb.1:
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%2:vgpr_32 = DS_READ_B32_gfx9 %1, 0, 0, implicit $exec :: (load 4, addrspace 3)
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INLINEASM &"", 1, 851978, def %0, 2147549193, %0(tied-def 3)
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INLINEASM &"", 1, 851977, %2
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INLINEASM &"", 1, 851978, def %0.sub1, 851978, def undef %0.sub0
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S_NOP 0, implicit %0.sub1
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$sgpr10 = S_MOV_B32 -1
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S_BRANCH %bb.1
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...
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