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clang-p2996/llvm/test/CodeGen/AMDGPU/licm-regpressure.mir
Stanislav Mekhanoshin b9e433b02a Prevent machine licm if remattable with a vreg use 
Check if a remateralizable nstruction does not have any virtual
register uses. Even though rematerializable RA might not actually
rematerialize it in this scenario. In that case we do not want to
hoist such instruction out of the loop in a believe RA will sink
it back if needed.

This already has impact on AMDGPU target which does not check for
this condition in its isTriviallyReMaterializable implementation
and have instructions with virtual register uses enabled. The
other targets are not impacted at this point although will be when
D106408 lands.

Differential Revision: https://reviews.llvm.org/D107677
2021-08-16 12:09:00 -07:00

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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -march=amdgcn -mcpu=gfx900 -verify-machineinstrs -run-pass machinelicm -o - %s | FileCheck -check-prefix=GCN %s
# MachineLICM shall limit hoisting of V_CVT instructions out of the loop keeping
# register pressure within the budget. VGPR budget at occupancy 10 is 24 vgprs.
---
name: test
tracksRegLiveness: true
body: |
; GCN-LABEL: name: test
; GCN: bb.0:
; GCN: successors: %bb.1(0x80000000)
; GCN: liveins: $vcc, $vgpr0
; GCN: [[COPY:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY1:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY2:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY3:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY4:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY5:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY6:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY7:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY8:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY9:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY10:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY11:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY12:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY13:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY14:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY15:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY16:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: [[COPY17:%[0-9]+]]:vgpr_32 = COPY $vgpr0
; GCN: %18:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY]], implicit $mode, implicit $exec
; GCN: %19:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY1]], implicit $mode, implicit $exec
; GCN: %20:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY2]], implicit $mode, implicit $exec
; GCN: %21:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY3]], implicit $mode, implicit $exec
; GCN: %22:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY4]], implicit $mode, implicit $exec
; GCN: bb.1:
; GCN: successors: %bb.2(0x04000000), %bb.1(0x7c000000)
; GCN: liveins: $vcc
; GCN: $vcc = S_AND_B64 $exec, $vcc, implicit-def $scc
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, %18, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, %19, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, %20, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, %21, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, %22, implicit $exec
; GCN: %23:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY5]], implicit $mode, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, killed %23, implicit $exec
; GCN: %24:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY6]], implicit $mode, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, killed %24, implicit $exec
; GCN: %25:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY7]], implicit $mode, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, killed %25, implicit $exec
; GCN: %26:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY8]], implicit $mode, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, killed %26, implicit $exec
; GCN: %27:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY9]], implicit $mode, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, killed %27, implicit $exec
; GCN: %28:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY10]], implicit $mode, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, killed %28, implicit $exec
; GCN: %29:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY11]], implicit $mode, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, killed %29, implicit $exec
; GCN: %30:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY12]], implicit $mode, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, killed %30, implicit $exec
; GCN: %31:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY13]], implicit $mode, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, killed %31, implicit $exec
; GCN: %32:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY14]], implicit $mode, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, killed %32, implicit $exec
; GCN: %33:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY15]], implicit $mode, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, killed %33, implicit $exec
; GCN: %34:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY16]], implicit $mode, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, killed %34, implicit $exec
; GCN: %35:vreg_64 = nofpexcept V_CVT_F64_I32_e32 [[COPY17]], implicit $mode, implicit $exec
; GCN: $vcc = V_CMP_EQ_U64_e64 $vcc, killed %35, implicit $exec
; GCN: S_CBRANCH_VCCNZ %bb.1, implicit $vcc
; GCN: S_BRANCH %bb.2
; GCN: bb.2:
; GCN: S_ENDPGM 0
bb.0:
successors: %bb.1(0x80000000)
liveins: $vcc, $vgpr0
%0:vgpr_32 = COPY $vgpr0
%1:vgpr_32 = COPY $vgpr0
%2:vgpr_32 = COPY $vgpr0
%3:vgpr_32 = COPY $vgpr0
%4:vgpr_32 = COPY $vgpr0
%5:vgpr_32 = COPY $vgpr0
%6:vgpr_32 = COPY $vgpr0
%7:vgpr_32 = COPY $vgpr0
%8:vgpr_32 = COPY $vgpr0
%9:vgpr_32 = COPY $vgpr0
%10:vgpr_32 = COPY $vgpr0
%11:vgpr_32 = COPY $vgpr0
%12:vgpr_32 = COPY $vgpr0
%13:vgpr_32 = COPY $vgpr0
%14:vgpr_32 = COPY $vgpr0
%15:vgpr_32 = COPY $vgpr0
%16:vgpr_32 = COPY $vgpr0
%17:vgpr_32 = COPY $vgpr0
bb.1:
successors: %bb.2(0x04000000), %bb.1(0x7c000000)
liveins: $vcc
$vcc = S_AND_B64 $exec, $vcc, implicit-def $scc
%18:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %0, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %18, implicit $exec
%19:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %1, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %19, implicit $exec
%20:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %2, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %20, implicit $exec
%21:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %3, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %21, implicit $exec
%22:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %4, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %22, implicit $exec
%23:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %5, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %23, implicit $exec
%24:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %6, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %24, implicit $exec
%25:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %7, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %25, implicit $exec
%26:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %8, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %26, implicit $exec
%27:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %9, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %27, implicit $exec
%28:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %10, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %28, implicit $exec
%29:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %11, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %29, implicit $exec
%30:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %12, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %30, implicit $exec
%31:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %13, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %31, implicit $exec
%32:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %14, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %32, implicit $exec
%33:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %15, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %33, implicit $exec
%34:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %16, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %34, implicit $exec
%35:vreg_64 = nofpexcept V_CVT_F64_I32_e32 %17, implicit $mode, implicit $exec
$vcc = V_CMP_EQ_U64_e64 $vcc, killed %35, implicit $exec
S_CBRANCH_VCCNZ %bb.1, implicit $vcc
S_BRANCH %bb.2
bb.2:
S_ENDPGM 0
...
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