6bc64e24c3
If these blocks are unreachable, then we can discard all of the instructions. However, keep the block around because it may have an address taken or the block may have a stale reference from a PHI somewhere. Instead of finding those PHIs and fixing them up, just leave the block empty. Differential Revision: https://reviews.llvm.org/D111201
62 lines
3.1 KiB
YAML
62 lines
3.1 KiB
YAML
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
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# RUN: llc -mtriple=aarch64-unknown-unknown -o - -verify-machineinstrs -run-pass=instruction-select %s | FileCheck %s
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# RUN: llc -mtriple=aarch64-unknown-unknown -o - -verify-machineinstrs -run-pass=instruction-select -code-model=large %s | FileCheck %s --check-prefix=LARGE
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--- |
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; ModuleID = 'blockaddress.ll'
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source_filename = "blockaddress.ll"
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target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64-none-linux-gnu"
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@addr = dso_local global i8* null
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define dso_local void @test_blockaddress() {
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store i8* blockaddress(@test_blockaddress, %block), i8** @addr
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indirectbr i8* blockaddress(@test_blockaddress, %block), [label %block]
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block: ; preds = %0
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ret void
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}
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...
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---
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name: test_blockaddress
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alignment: 4
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legalized: true
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regBankSelected: true
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tracksRegLiveness: true
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registers:
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- { id: 0, class: gpr }
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- { id: 1, class: gpr }
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body: |
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; CHECK-LABEL: name: test_blockaddress
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; CHECK: bb.0 (%ir-block.0):
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; CHECK: [[MOVaddrBA:%[0-9]+]]:gpr64common = MOVaddrBA target-flags(aarch64-page) blockaddress(@test_blockaddress, %ir-block.block), target-flags(aarch64-pageoff, aarch64-nc) blockaddress(@test_blockaddress, %ir-block.block)
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; CHECK: [[MOVaddr:%[0-9]+]]:gpr64common = MOVaddr target-flags(aarch64-page) @addr, target-flags(aarch64-pageoff, aarch64-nc) @addr
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; CHECK: [[COPY:%[0-9]+]]:gpr64 = COPY [[MOVaddrBA]]
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; CHECK: STRXui [[COPY]], [[MOVaddr]], 0 :: (store (p0) into @addr)
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; CHECK: BR [[MOVaddrBA]]
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; CHECK: bb.1.block (address-taken):
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; LARGE-LABEL: name: test_blockaddress
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; LARGE: bb.0 (%ir-block.0):
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; LARGE: [[MOVZXi:%[0-9]+]]:gpr64 = MOVZXi target-flags(aarch64-g0, aarch64-nc) blockaddress(@test_blockaddress, %ir-block.block), 0
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; LARGE: [[MOVKXi:%[0-9]+]]:gpr64 = MOVKXi [[MOVZXi]], target-flags(aarch64-g1, aarch64-nc) blockaddress(@test_blockaddress, %ir-block.block), 16
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; LARGE: [[MOVKXi1:%[0-9]+]]:gpr64 = MOVKXi [[MOVKXi]], target-flags(aarch64-g2, aarch64-nc) blockaddress(@test_blockaddress, %ir-block.block), 32
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; LARGE: [[MOVKXi2:%[0-9]+]]:gpr64 = MOVKXi [[MOVKXi1]], target-flags(aarch64-g3) blockaddress(@test_blockaddress, %ir-block.block), 48
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; LARGE: [[MOVZXi1:%[0-9]+]]:gpr64 = MOVZXi target-flags(aarch64-g0, aarch64-nc) @addr, 0
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; LARGE: [[MOVKXi3:%[0-9]+]]:gpr64 = MOVKXi [[MOVZXi1]], target-flags(aarch64-g1, aarch64-nc) @addr, 16
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; LARGE: [[MOVKXi4:%[0-9]+]]:gpr64 = MOVKXi [[MOVKXi3]], target-flags(aarch64-g2, aarch64-nc) @addr, 32
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; LARGE: [[MOVKXi5:%[0-9]+]]:gpr64common = MOVKXi [[MOVKXi4]], target-flags(aarch64-g3) @addr, 48
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; LARGE: STRXui [[MOVKXi2]], [[MOVKXi5]], 0 :: (store (p0) into @addr)
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; LARGE: BR [[MOVKXi2]]
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; LARGE: bb.1.block (address-taken):
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bb.1 (%ir-block.0):
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%0:gpr(p0) = G_BLOCK_ADDR blockaddress(@test_blockaddress, %ir-block.block)
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%1:gpr(p0) = G_GLOBAL_VALUE @addr
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G_STORE %0(p0), %1(p0) :: (store (p0) into @addr)
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G_BRINDIRECT %0(p0)
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bb.2.block (address-taken):
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RET_ReallyLR
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...
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