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[MachineLICM] Precommit a test showing wrong behaviour. #118783

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223 changes: 223 additions & 0 deletions llvm/test/CodeGen/RISCV/machinelicm-high-reg-pressure.mir
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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
# RUN: llc %s -mtriple=riscv64 -run-pass=early-machinelicm -o - | FileCheck %s

# The instruction `%invariant:gpr = ADDI %y, -1` can be hoisted, but should not because it will increase register pressure beyond the limit.
---
name: foo
tracksRegLiveness: true
body: |
; CHECK-LABEL: name: foo
; CHECK: bb.0.entry:
; CHECK-NEXT: successors: %bb.1(0x80000000)
; CHECK-NEXT: liveins: $x10, $x11, $x12
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: %n:gpr = COPY $x10
; CHECK-NEXT: %base_addr:gpr = COPY $x11
; CHECK-NEXT: %y:gpr = COPY $x12
; CHECK-NEXT: %zero:gpr = COPY $x0
; CHECK-NEXT: %invariant:gpr = ADDI %y, -1
; CHECK-NEXT: %use_y:gpr = ADDI %y, -2
; CHECK-NEXT: %z:gpr = ADD %use_y, %invariant
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.1:
; CHECK-NEXT: successors: %bb.1(0x40000000), %bb.2(0x40000000)
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: %i:gpr = PHI %n, %bb.0, %i_dec, %bb.1
; CHECK-NEXT: %addr:gpr = ADD %base_addr, %i
; CHECK-NEXT: %x_0:gpr = LD %addr, 0 :: (load (s64))
; CHECK-NEXT: %x_1:gpr = LD %addr, 1 :: (load (s64))
; CHECK-NEXT: %x_2:gpr = LD %addr, 2 :: (load (s64))
; CHECK-NEXT: %x_3:gpr = LD %addr, 3 :: (load (s64))
; CHECK-NEXT: %x_4:gpr = LD %addr, 4 :: (load (s64))
; CHECK-NEXT: %x_5:gpr = LD %addr, 5 :: (load (s64))
; CHECK-NEXT: %x_6:gpr = LD %addr, 6 :: (load (s64))
; CHECK-NEXT: %x_7:gpr = LD %addr, 7 :: (load (s64))
; CHECK-NEXT: %x_8:gpr = LD %addr, 8 :: (load (s64))
; CHECK-NEXT: %x_9:gpr = LD %addr, 9 :: (load (s64))
; CHECK-NEXT: %x_10:gpr = LD %addr, 10 :: (load (s64))
; CHECK-NEXT: %x_11:gpr = LD %addr, 11 :: (load (s64))
; CHECK-NEXT: %x_12:gpr = LD %addr, 12 :: (load (s64))
; CHECK-NEXT: %x_13:gpr = LD %addr, 13 :: (load (s64))
; CHECK-NEXT: %x_14:gpr = LD %addr, 14 :: (load (s64))
; CHECK-NEXT: %x_15:gpr = LD %addr, 15 :: (load (s64))
; CHECK-NEXT: %x_16:gpr = LD %addr, 16 :: (load (s64))
; CHECK-NEXT: %x_17:gpr = LD %addr, 17 :: (load (s64))
; CHECK-NEXT: %x_18:gpr = LD %addr, 18 :: (load (s64))
; CHECK-NEXT: %x_19:gpr = LD %addr, 19 :: (load (s64))
; CHECK-NEXT: %x_20:gpr = LD %addr, 20 :: (load (s64))
; CHECK-NEXT: %x_21:gpr = LD %addr, 21 :: (load (s64))
; CHECK-NEXT: %x_22:gpr = LD %addr, 22 :: (load (s64))
; CHECK-NEXT: %x_23:gpr = LD %addr, 23 :: (load (s64))
; CHECK-NEXT: %x_24:gpr = LD %addr, 24 :: (load (s64))
; CHECK-NEXT: %x_25:gpr = LD %addr, 25 :: (load (s64))
; CHECK-NEXT: %x_26:gpr = LD %addr, 26 :: (load (s64))
; CHECK-NEXT: %x_26_1:gpr = ADDI %x_26, 1
; CHECK-NEXT: %x_25_1:gpr = ADDI %x_25, 1
; CHECK-NEXT: %x_24_1:gpr = ADDI %x_24, 1
; CHECK-NEXT: %x_23_1:gpr = ADDI %x_23, 1
; CHECK-NEXT: %x_22_1:gpr = ADDI %x_22, 1
; CHECK-NEXT: %x_21_1:gpr = ADDI %x_21, 1
; CHECK-NEXT: %x_20_1:gpr = ADDI %x_20, 1
; CHECK-NEXT: %x_19_1:gpr = ADDI %x_19, 1
; CHECK-NEXT: %x_18_1:gpr = ADDI %x_18, 1
; CHECK-NEXT: %x_17_1:gpr = ADDI %x_17, 1
; CHECK-NEXT: %x_16_1:gpr = ADDI %x_16, 1
; CHECK-NEXT: %x_15_1:gpr = ADDI %x_15, 1
; CHECK-NEXT: %x_14_1:gpr = ADDI %x_14, 1
; CHECK-NEXT: %x_13_1:gpr = ADDI %x_13, 1
; CHECK-NEXT: %x_12_1:gpr = ADDI %x_12, 1
; CHECK-NEXT: %x_11_1:gpr = ADDI %x_11, 1
; CHECK-NEXT: %x_10_1:gpr = ADDI %x_10, 1
; CHECK-NEXT: %x_9_1:gpr = ADDI %x_9, 1
; CHECK-NEXT: %x_8_1:gpr = ADDI %x_8, 1
; CHECK-NEXT: %x_7_1:gpr = ADDI %x_7, 1
; CHECK-NEXT: %x_6_1:gpr = ADDI %x_6, 1
; CHECK-NEXT: %x_5_1:gpr = ADDI %x_5, 1
; CHECK-NEXT: %x_4_1:gpr = ADDI %x_4, 1
; CHECK-NEXT: %x_3_1:gpr = ADDI %x_3, 1
; CHECK-NEXT: %x_2_1:gpr = ADDI %x_2, 1
; CHECK-NEXT: %x_1_1:gpr = ADDI %x_1, 1
; CHECK-NEXT: %x_0_1:gpr = ADDI %x_0, 1
; CHECK-NEXT: SD %x_26_1, %addr, 26 :: (store (s64))
; CHECK-NEXT: SD %x_25_1, %addr, 25 :: (store (s64))
; CHECK-NEXT: SD %x_24_1, %addr, 24 :: (store (s64))
; CHECK-NEXT: SD %x_23_1, %addr, 23 :: (store (s64))
; CHECK-NEXT: SD %x_22_1, %addr, 22 :: (store (s64))
; CHECK-NEXT: SD %x_21_1, %addr, 21 :: (store (s64))
; CHECK-NEXT: SD %x_20_1, %addr, 20 :: (store (s64))
; CHECK-NEXT: SD %x_19_1, %addr, 19 :: (store (s64))
; CHECK-NEXT: SD %x_18_1, %addr, 18 :: (store (s64))
; CHECK-NEXT: SD %x_17_1, %addr, 17 :: (store (s64))
; CHECK-NEXT: SD %x_16_1, %addr, 16 :: (store (s64))
; CHECK-NEXT: SD %x_15_1, %addr, 15 :: (store (s64))
; CHECK-NEXT: SD %x_14_1, %addr, 14 :: (store (s64))
; CHECK-NEXT: SD %x_13_1, %addr, 13 :: (store (s64))
; CHECK-NEXT: SD %x_12_1, %addr, 12 :: (store (s64))
; CHECK-NEXT: SD %x_11_1, %addr, 11 :: (store (s64))
; CHECK-NEXT: SD %x_10_1, %addr, 10 :: (store (s64))
; CHECK-NEXT: SD %x_9_1, %addr, 9 :: (store (s64))
; CHECK-NEXT: SD %x_8_1, %addr, 8 :: (store (s64))
; CHECK-NEXT: SD %x_7_1, %addr, 7 :: (store (s64))
; CHECK-NEXT: SD %x_6_1, %addr, 6 :: (store (s64))
; CHECK-NEXT: SD %x_5_1, %addr, 5 :: (store (s64))
; CHECK-NEXT: SD %x_4_1, %addr, 4 :: (store (s64))
; CHECK-NEXT: SD %x_3_1, %addr, 3 :: (store (s64))
; CHECK-NEXT: SD %x_2_1, %addr, 2 :: (store (s64))
; CHECK-NEXT: SD %x_1_1, %addr, 1 :: (store (s64))
; CHECK-NEXT: SD %x_0_1, %addr, 0 :: (store (s64))
; CHECK-NEXT: %i_dec:gpr = ADD %i, %z
; CHECK-NEXT: BEQ %i_dec, %zero, %bb.1
; CHECK-NEXT: PseudoBR %bb.2
; CHECK-NEXT: {{ $}}
; CHECK-NEXT: bb.2:
; CHECK-NEXT: PseudoRET
bb.0.entry:
successors: %bb.1(0x50000000)
liveins: $x10, $x11, $x12

%n:gpr = COPY $x10
%base_addr:gpr = COPY $x11
%y:gpr = COPY $x12
%zero:gpr = COPY $x0

bb.1:
successors: %bb.1, %bb.2
%i:gpr = PHI %n, %bb.0, %i_dec, %bb.1
%addr:gpr = ADD %base_addr, %i

%x_0:gpr = LD %addr, 0 :: (load (s64))
%x_1:gpr = LD %addr, 1 :: (load (s64))
%x_2:gpr = LD %addr, 2 :: (load (s64))
%x_3:gpr = LD %addr, 3 :: (load (s64))
%x_4:gpr = LD %addr, 4 :: (load (s64))
%x_5:gpr = LD %addr, 5 :: (load (s64))
%x_6:gpr = LD %addr, 6 :: (load (s64))
%x_7:gpr = LD %addr, 7 :: (load (s64))
%x_8:gpr = LD %addr, 8 :: (load (s64))
%x_9:gpr = LD %addr, 9 :: (load (s64))
%x_10:gpr = LD %addr, 10 :: (load (s64))
%x_11:gpr = LD %addr, 11 :: (load (s64))
%x_12:gpr = LD %addr, 12 :: (load (s64))
%x_13:gpr = LD %addr, 13 :: (load (s64))
%x_14:gpr = LD %addr, 14 :: (load (s64))
%x_15:gpr = LD %addr, 15 :: (load (s64))
%x_16:gpr = LD %addr, 16 :: (load (s64))
%x_17:gpr = LD %addr, 17 :: (load (s64))
%x_18:gpr = LD %addr, 18 :: (load (s64))
%x_19:gpr = LD %addr, 19 :: (load (s64))
%x_20:gpr = LD %addr, 20 :: (load (s64))
%x_21:gpr = LD %addr, 21 :: (load (s64))
%x_22:gpr = LD %addr, 22 :: (load (s64))
%x_23:gpr = LD %addr, 23 :: (load (s64))
%x_24:gpr = LD %addr, 24 :: (load (s64))
%x_25:gpr = LD %addr, 25 :: (load (s64))
%x_26:gpr = LD %addr, 26 :: (load (s64))


%x_26_1:gpr = ADDI %x_26, 1
%x_25_1:gpr = ADDI %x_25, 1
%x_24_1:gpr = ADDI %x_24, 1
%x_23_1:gpr = ADDI %x_23, 1
%x_22_1:gpr = ADDI %x_22, 1
%x_21_1:gpr = ADDI %x_21, 1
%x_20_1:gpr = ADDI %x_20, 1
%x_19_1:gpr = ADDI %x_19, 1
%x_18_1:gpr = ADDI %x_18, 1
%x_17_1:gpr = ADDI %x_17, 1
%x_16_1:gpr = ADDI %x_16, 1
%x_15_1:gpr = ADDI %x_15, 1
%x_14_1:gpr = ADDI %x_14, 1
%x_13_1:gpr = ADDI %x_13, 1
%x_12_1:gpr = ADDI %x_12, 1
%x_11_1:gpr = ADDI %x_11, 1
%x_10_1:gpr = ADDI %x_10, 1
%x_9_1:gpr = ADDI %x_9, 1
%x_8_1:gpr = ADDI %x_8, 1
%x_7_1:gpr = ADDI %x_7, 1
%x_6_1:gpr = ADDI %x_6, 1
%x_5_1:gpr = ADDI %x_5, 1
%x_4_1:gpr = ADDI %x_4, 1
%x_3_1:gpr = ADDI %x_3, 1
%x_2_1:gpr = ADDI %x_2, 1
%x_1_1:gpr = ADDI %x_1, 1
%x_0_1:gpr = ADDI %x_0, 1

%invariant:gpr = ADDI %y, -1

SD %x_26_1, %addr, 26 :: (store (s64))
SD %x_25_1, %addr, 25 :: (store (s64))
SD %x_24_1, %addr, 24 :: (store (s64))
SD %x_23_1, %addr, 23 :: (store (s64))
SD %x_22_1, %addr, 22 :: (store (s64))
SD %x_21_1, %addr, 21 :: (store (s64))
SD %x_20_1, %addr, 20 :: (store (s64))
SD %x_19_1, %addr, 19 :: (store (s64))
SD %x_18_1, %addr, 18 :: (store (s64))
SD %x_17_1, %addr, 17 :: (store (s64))
SD %x_16_1, %addr, 16 :: (store (s64))
SD %x_15_1, %addr, 15 :: (store (s64))
SD %x_14_1, %addr, 14 :: (store (s64))
SD %x_13_1, %addr, 13 :: (store (s64))
SD %x_12_1, %addr, 12 :: (store (s64))
SD %x_11_1, %addr, 11 :: (store (s64))
SD %x_10_1, %addr, 10 :: (store (s64))
SD %x_9_1, %addr, 9 :: (store (s64))
SD %x_8_1, %addr, 8 :: (store (s64))
SD %x_7_1, %addr, 7 :: (store (s64))
SD %x_6_1, %addr, 6 :: (store (s64))
SD %x_5_1, %addr, 5 :: (store (s64))
SD %x_4_1, %addr, 4 :: (store (s64))
SD %x_3_1, %addr, 3 :: (store (s64))
SD %x_2_1, %addr, 2 :: (store (s64))
SD %x_1_1, %addr, 1 :: (store (s64))
SD %x_0_1, %addr, 0 :: (store (s64))

%use_y:gpr = ADDI %y, -2
%z:gpr = ADD %use_y, %invariant
%i_dec:gpr = ADD %i, %z
BEQ %i_dec, %zero, %bb.1
PseudoBR %bb.2

bb.2:
PseudoRET
...
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