83 lines
3.0 KiB
Plaintext
83 lines
3.0 KiB
Plaintext
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# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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# RUN: llc -mtriple aarch64 -run-pass=aarch64-prelegalizer-combiner -verify-machineinstrs %s -o - | FileCheck %s
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--- |
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@g = external hidden unnamed_addr global i32, align 4
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define void @not_necessarily_equiv_loads() { ret void }
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define void @invariant_loads() { ret void }
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define void @both_have_to_be_invariant() { ret void }
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...
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---
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name: not_necessarily_equiv_loads
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tracksRegLiveness: true
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machineFunctionInfo: {}
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body: |
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bb.0:
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; %load1 || %load2 == %load1 is not necessarily true, even though they
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; both load from the same address. Whatever is in that address may be
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; changed by another instruction which appears between them.
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;
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; Check that we don't remove the G_OR.
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; CHECK-LABEL: name: not_necessarily_equiv_loads
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; CHECK: %ptr:_(p0) = G_GLOBAL_VALUE @g
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; CHECK: %load1:_(s32) = G_LOAD %ptr(p0) :: (load 4 from @g)
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; CHECK: %load2:_(s32) = G_LOAD %ptr(p0) :: (load 4 from @g)
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; CHECK: %or:_(s32) = G_OR %load2, %load1
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; CHECK: G_STORE %or(s32), %ptr(p0) :: (store 4 into @g)
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; CHECK: RET_ReallyLR
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%ptr:_(p0) = G_GLOBAL_VALUE @g
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%load1:_(s32) = G_LOAD %ptr(p0) :: (load 4 from @g)
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%load2:_(s32) = G_LOAD %ptr(p0) :: (load 4 from @g)
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%or:_(s32) = G_OR %load2, %load1
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G_STORE %or(s32), %ptr(p0) :: (store 4 into @g)
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RET_ReallyLR
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...
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---
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name: invariant_loads
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tracksRegLiveness: true
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machineFunctionInfo: {}
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body: |
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bb.0:
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; %load1 || %load2 == %load1 is fine here, because the loads are invariant.
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; CHECK-LABEL: name: invariant_loads
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; CHECK: %ptr:_(p0) = G_GLOBAL_VALUE @g
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; CHECK: %load2:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable invariant load 4 from @g)
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; CHECK: G_STORE %load2(s32), %ptr(p0) :: (store 4 into @g)
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; CHECK: RET_ReallyLR
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%ptr:_(p0) = G_GLOBAL_VALUE @g
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%load1:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable invariant load 4 from @g)
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%load2:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable invariant load 4 from @g)
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%or:_(s32) = G_OR %load2, %load1
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G_STORE %or(s32), %ptr(p0) :: (store 4 into @g)
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RET_ReallyLR
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...
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---
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name: both_have_to_be_invariant
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tracksRegLiveness: true
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machineFunctionInfo: {}
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body: |
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bb.0:
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; We shouldn't combine here, because the loads both have to be invariant.
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; CHECK-LABEL: name: both_have_to_be_invariant
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; CHECK: %ptr:_(p0) = G_GLOBAL_VALUE @g
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; CHECK: %load1:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable invariant load 4 from @g)
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; CHECK: %load2:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable load 4 from @g)
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; CHECK: %or:_(s32) = G_OR %load2, %load1
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; CHECK: G_STORE %or(s32), %ptr(p0) :: (store 4 into @g)
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; CHECK: RET_ReallyLR
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%ptr:_(p0) = G_GLOBAL_VALUE @g
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%load1:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable invariant load 4 from @g)
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%load2:_(s32) = G_LOAD %ptr(p0) :: (dereferenceable load 4 from @g)
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%or:_(s32) = G_OR %load2, %load1
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G_STORE %or(s32), %ptr(p0) :: (store 4 into @g)
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RET_ReallyLR
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...
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