107 lines
3.4 KiB
Plaintext
107 lines
3.4 KiB
Plaintext
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# RUN: llc -run-pass=prologepilog -reverse-csr-restore-seq -o - -mtriple=aarch64-- %s | FileCheck %s --check-prefixes=CHECK,BEFORELDSTOPT
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# RUN: llc -start-before=prologepilog -stop-after=aarch64-ldst-opt -reverse-csr-restore-seq -o - -mtriple=aarch64-- %s | FileCheck %s --check-prefixes=CHECK,AFTERLDSTOPT
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#
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--- |
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define void @foo() nounwind { entry: unreachable }
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define void @bar() nounwind { entry: unreachable }
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define void @baz() nounwind { entry: unreachable }
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...
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---
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name: foo
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# CHECK-LABEL: name: foo
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tracksRegLiveness: true
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body: |
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bb.0:
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$x19 = IMPLICIT_DEF
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$x20 = IMPLICIT_DEF
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$x21 = IMPLICIT_DEF
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$x22 = IMPLICIT_DEF
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$x23 = IMPLICIT_DEF
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$x24 = IMPLICIT_DEF
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$x25 = IMPLICIT_DEF
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$x26 = IMPLICIT_DEF
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; The local stack size is 0, so the last ldp in the sequence will also
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; restore the stack.
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; CHECK: $x24, $x23 = frame-destroy LDPXi $sp, 2
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; CHECK-NEXT: $x22, $x21 = frame-destroy LDPXi $sp, 4
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; CHECK-NEXT: $x20, $x19 = frame-destroy LDPXi $sp, 6
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; Before running the load-store optimizer, we emit a ldp and an add.
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; BEFORELDSTOPT-NEXT: $x26, $x25 = frame-destroy LDPXi $sp, 0
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; BEFORELDSTOPT-NEXT: $sp = frame-destroy ADDXri $sp, 64, 0
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; We want to make sure that after running the load-store optimizer, the ldp
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; and the add get merged into a post-index ldp.
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; AFTERLDSTOPT-NEXT: early-clobber $sp, $x26, $x25 = frame-destroy LDPXpost $sp, 8
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RET_ReallyLR
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...
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---
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name: bar
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# CHECK-LABEL: name: bar
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tracksRegLiveness: true
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stack:
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- { id : 0, size: 8, alignment: 4,
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stack-id: default, callee-saved-register: '', callee-saved-restored: true,
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local-offset: -4, debug-info-variable: '', debug-info-expression: '',
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debug-info-location: '' }
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body: |
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bb.0:
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$x19 = IMPLICIT_DEF
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$x20 = IMPLICIT_DEF
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$x21 = IMPLICIT_DEF
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$x22 = IMPLICIT_DEF
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$x23 = IMPLICIT_DEF
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$x24 = IMPLICIT_DEF
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$x25 = IMPLICIT_DEF
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$x26 = IMPLICIT_DEF
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; The local stack size is not 0, and we can combine the CSR stack size with
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; the local stack size. This results in rewriting the offsets for all the
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; save/restores and forbids us to merge the stack adjustment and the last pop.
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; In this case, there is no point of moving the first CSR pair at the end.
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; CHECK: $x26, $x25 = frame-destroy LDPXi $sp, 2
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; CHECK-NEXT: $x24, $x23 = frame-destroy LDPXi $sp, 4
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; CHECK-NEXT: $x22, $x21 = frame-destroy LDPXi $sp, 6
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; CHECK-NEXT: $x20, $x19 = frame-destroy LDPXi $sp, 8
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; CHECK-NEXT: $sp = frame-destroy ADDXri $sp, 80, 0
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RET_ReallyLR
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...
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---
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# Check that the load from the offset 0 is moved at the end even when hasFP is
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# false.
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name: baz
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# CHECK-LABEL: name: baz
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alignment: 4
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tracksRegLiveness: true
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frameInfo:
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adjustsStack: true
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hasCalls: true
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body: |
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bb.0:
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successors: %bb.1
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$x0 = IMPLICIT_DEF
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$x20 = IMPLICIT_DEF
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$x21 = IMPLICIT_DEF
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ADJCALLSTACKDOWN 0, 0, implicit-def dead $sp, implicit $sp
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BL @foo, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit $x0, implicit-def $sp, implicit-def $x0
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ADJCALLSTACKUP 0, 0, implicit-def dead $sp, implicit $sp
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B %bb.1
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bb.1:
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; CHECK: $x21, $x20 = frame-destroy LDPXi $sp, 2
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; BEFORELDSTOPT-NEXT: $lr = frame-destroy LDRXui $sp, 0
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; BEFORELDSTOPT-NEXT: $sp = frame-destroy ADDXri $sp, 32, 0
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; AFTERLDSTOPT-NEXT: early-clobber $sp, $lr = frame-destroy LDRXpost $sp, 32
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RET_ReallyLR
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...
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