test/CodeGen/AArch64/GlobalISel/arm64-regbankselect.mir

# RUN: llc -O0 -run-pass=regbankselect -global-isel %s -o - 2>&1 | FileCheck %s --check-prefix=CHECK --check-prefix=FAST
# RUN: llc -O0 -run-pass=regbankselect -global-isel %s -regbankselect-greedy -o - 2>&1 | FileCheck %s --check-prefix=CHECK --check-prefix=GREEDY
# REQUIRES: global-isel

--- |
  ; ModuleID = 'generic-virtual-registers-type-error.mir'
  target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
  target triple = "aarch64-apple-ios"
  define void @defaultMapping() {
  entry:
    ret void
  }
  define void @defaultMappingVector() {
  entry:
    ret void
  }
  define void @defaultMapping1Repair() {
  entry:
    ret void
  }
  define void @defaultMapping2Repairs() {
  entry:
    ret void
  }
  define void @defaultMappingDefRepair() {
  entry:
    ret void
  }
  define void @phiPropagation(i32* %src, i32* %dst, i1 %cond) {
  entry:
    %srcVal = load i32, i32* %src
    br i1 %cond, label %end, label %then
  then:
    %res = add i32 %srcVal, 36
    br label %end
  end:
    %toStore = phi i32 [ %srcVal, %entry ], [ %res, %then ]
    store i32 %toStore, i32* %dst
    ret void
  }
  define void @defaultMappingUseRepairPhysReg() {
  entry:
    ret void
  }
  define void @defaultMappingDefRepairPhysReg() {
  entry:
    ret void
  }
  define void @greedyMappingOr() {
  entry:
    ret void
  }
  define void @greedyMappingOrWithConstraints() {
  entry:
    ret void
  }
...

---
# Check that we assign a relevant register bank for %0.
# Based on the type i32, this should be gpr.
name:            defaultMapping
isSSA:           true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gpr }
registers:
  - { id: 0, class: _ }
body: |
  bb.0.entry:
    liveins: %x0
    ; CHECK:      %0(32) = G_ADD i32 %x0
    %0(32) = G_ADD i32 %x0, %x0
...

---
# Check that we assign a relevant register bank for %0.
# Based on the type <2 x i32>, this should be fpr.
# FPR is used for both floating point and vector registers.
name:            defaultMappingVector
isSSA:           true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: fpr }
registers:
  - { id: 0, class: _ }
body: |
  bb.0.entry:
    liveins: %d0
    ; CHECK:      %0(32) = G_ADD <2 x i32> %d0
    %0(32) = G_ADD <2 x i32> %d0, %d0
...

---
# Check that we repair the assignment for %0.
# Indeed based on the source of the copy it should live
# in FPR, but at the use, it should be GPR.
name:            defaultMapping1Repair
isSSA:           true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: fpr }
# CHECK-NEXT:   - { id: 1, class: gpr }
# CHECK-NEXT:   - { id: 2, class: gpr }
registers:
  - { id: 0, class: _ }
  - { id: 1, class: _ }
body: |
  bb.0.entry:
    liveins: %s0, %x0
    ; CHECK:           %0(32) = COPY %s0
    ; CHECK-NEXT:      %2(32) = COPY %0
    ; CHECK-NEXT:      %1(32) = G_ADD i32 %2, %x0
    %0(32) = COPY %s0
    %1(32) = G_ADD i32 %0, %x0
...

# Check that we repair the assignment for %0 differently for both uses.
name:            defaultMapping2Repairs
isSSA:           true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: fpr }
# CHECK-NEXT:   - { id: 1, class: gpr }
# CHECK-NEXT:   - { id: 2, class: gpr }
# CHECK-NEXT:   - { id: 3, class: gpr }
registers:
  - { id: 0, class: _ }
  - { id: 1, class: _ }
body: |
  bb.0.entry:
    liveins: %s0, %x0
    ; CHECK:           %0(32) = COPY %s0
    ; CHECK-NEXT:      %2(32) = COPY %0
    ; CHECK-NEXT:      %3(32) = COPY %0
    ; CHECK-NEXT:      %1(32) = G_ADD i32 %2, %3
    %0(32) = COPY %s0
    %1(32) = G_ADD i32 %0, %0
...

---
# Check that we repair the definition of %1.
# %1 is forced to be into FPR, but its definition actually
# requires that it lives in GPR. Make sure regbankselect
# fixes that.
name:            defaultMappingDefRepair
isSSA:           true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gpr }
# CHECK-NEXT:   - { id: 1, class: fpr }
# CHECK-NEXT:   - { id: 2, class: gpr }
registers:
  - { id: 0, class: _ }
  - { id: 1, class: fpr }
body: |
  bb.0.entry:
    liveins: %w0
    ; CHECK:           %0(32) = COPY %w0
    ; CHECK-NEXT:      %2(32) = G_ADD i32 %0, %w0
    ; CHECK-NEXT:      %1(32) = COPY %2
    %0(32) = COPY %w0
    %1(32) = G_ADD i32 %0, %w0
...

---
# Check that we are able to propagate register banks from phis.
name:            phiPropagation
isSSA:           true
tracksRegLiveness:   true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gpr32 }
# CHECK-NEXT:   - { id: 1, class: gpr64sp }
# CHECK-NEXT:   - { id: 2, class: gpr32 }
# CHECK-NEXT:   - { id: 3, class: gpr }
# CHECK-NEXT:   - { id: 4, class: gpr }
registers:
  - { id: 0, class: gpr32 }
  - { id: 1, class: gpr64sp }
  - { id: 2, class: gpr32 }
  - { id: 3, class: _ }
  - { id: 4, class: _ }
body: |
  bb.0.entry:
    successors: %bb.2.end, %bb.1.then
    liveins: %x0, %x1, %w2
  
    %0 = LDRWui killed %x0, 0 :: (load 4 from %ir.src)
    %1 = COPY %x1
    %2 = COPY %w2
    TBNZW killed %2, 0, %bb.2.end
  
  bb.1.then:
    successors: %bb.2.end
    %3(32) = G_ADD i32 %0, %0
  
  bb.2.end:
    %4(32) = PHI %0, %bb.0.entry, %3, %bb.1.then
    STRWui killed %4, killed %1, 0 :: (store 4 into %ir.dst)
    RET_ReallyLR
...

---
# Make sure we can repair physical register uses as well.
name:            defaultMappingUseRepairPhysReg
isSSA:           true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gpr }
# CHECK-NEXT:   - { id: 1, class: gpr }
# CHECK-NEXT:   - { id: 2, class: gpr }
registers:
  - { id: 0, class: _ }
  - { id: 1, class: _ }
body: |
  bb.0.entry:
    liveins: %w0, %s0
    ; CHECK:           %0(32) = COPY %w0
    ; CHECK-NEXT:      %2(32) = COPY %s0
    ; CHECK-NEXT:      %1(32) = G_ADD i32 %0, %2
    %0(32) = COPY %w0
    %1(32) = G_ADD i32 %0, %s0
...

---
# Make sure we can repair physical register defs.
name:            defaultMappingDefRepairPhysReg
isSSA:           true
# CHECK:      registers:
# CHECK-NEXT:   - { id: 0, class: gpr }
# CHECK-NEXT:   - { id: 1, class: gpr }
registers:
  - { id: 0, class: _ }
body: |
  bb.0.entry:
    liveins: %w0
    ; CHECK:           %0(32) = COPY %w0
    ; CHECK-NEXT:      %1(32) = G_ADD i32 %0, %0
    ; CHECK-NEXT:      %s0 = COPY %1
    %0(32) = COPY %w0
    %s0 = G_ADD i32 %0, %0
...

---
# Check that the greedy mode is able to switch the
# G_OR instruction from fpr to gpr.
name:            greedyMappingOr
isSSA:           true
# CHECK:      registers:
# CHECK-NEXT:  - { id: 0, class: gpr }
# CHECK-NEXT:  - { id: 1, class: gpr }

# Fast mode maps vector instruction on FPR.
# FAST-NEXT:  - { id: 2, class: fpr }
# Fast mode needs two extra copies.
# FAST-NEXT:  - { id: 3, class: fpr }
# FAST-NEXT:  - { id: 4, class: fpr }

# Greedy mode coalesce the computation on the GPR register
# because it is the cheapest.
# GREEDY-NEXT:  - { id: 2, class: gpr }

registers:
  - { id: 0, class: _ }
  - { id: 1, class: _ }
  - { id: 2, class: _ }
body: |
  bb.0.entry:
    liveins: %x0, %x1
    ; CHECK: %0(64) = COPY %x0
    ; CHECK-NEXT: %1(64) = COPY %x1


    ; Fast mode tries to reuse the source of the copy for the destination.
    ; Now, the default mapping says that %0 and %1 need to be in FPR.
    ; The repairing code insert two copies to materialize that.
    ; FAST-NEXT: %3(64) = COPY %0
    ; FAST-NEXT: %4(64) = COPY %1
    ; The mapping of G_OR is on FPR.
    ; FAST-NEXT: %2(64) = G_OR <2 x i32> %3, %4

    ; Greedy mode remapped the instruction on the GPR bank.
    ; GREEDY-NEXT: %2(64) = G_OR <2 x i32> %0, %1
    %0(64) = COPY %x0
    %1(64) = COPY %x1
    %2(64) = G_OR <2 x i32> %0, %1
...

---
# Check that the greedy mode is able to switch the
# G_OR instruction from fpr to gpr, while still honoring
# %2 constraint.
name:            greedyMappingOrWithConstraints
isSSA:           true
# CHECK:      registers:
# CHECK-NEXT:  - { id: 0, class: gpr }
# CHECK-NEXT:  - { id: 1, class: gpr }
# CHECK-NEXT:  - { id: 2, class: fpr }

# Fast mode maps vector instruction on FPR.
# Fast mode needs two extra copies.
# FAST-NEXT:  - { id: 3, class: fpr }
# FAST-NEXT:  - { id: 4, class: fpr }

# Greedy mode coalesce the computation on the GPR register because it
# is the cheapest, but will need one extra copy to materialize %2 into a FPR.
# GREEDY-NEXT:  - { id: 3, class: gpr }

registers:
  - { id: 0, class: _ }
  - { id: 1, class: _ }
  - { id: 2, class: fpr }
body: |
  bb.0.entry:
    liveins: %x0, %x1
    ; CHECK: %0(64) = COPY %x0
    ; CHECK-NEXT: %1(64) = COPY %x1


    ; Fast mode tries to reuse the source of the copy for the destination.
    ; Now, the default mapping says that %0 and %1 need to be in FPR.
    ; The repairing code insert two copies to materialize that.
    ; FAST-NEXT: %3(64) = COPY %0
    ; FAST-NEXT: %4(64) = COPY %1
    ; The mapping of G_OR is on FPR.
    ; FAST-NEXT: %2(64) = G_OR <2 x i32> %3, %4

    ; Greedy mode remapped the instruction on the GPR bank.
    ; GREEDY-NEXT: %3(64) = G_OR <2 x i32> %0, %1
    ; We need to keep %2 into FPR because we do not know anything about it.
    ; GREEDY-NEXT: %2(64) = COPY %3
    %0(64) = COPY %x0
    %1(64) = COPY %x1
    %2(64) = G_OR <2 x i32> %0, %1
...