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387345645f
This moves the stack check logic into a lambda within getOutliningCandidateInfo. This allows us to be less conservative with stack checks. Whether or not a stack instruction is safe to outline is dependent on the frame variant and call variant of the outlined function; only in cases where we modify the stack can these be unsafe. So, if we move that logic later, when we're looking at an individual candidate, we can make better decisions here. This gives some code size savings as a result. llvm-svn: 348220
73 lines
1.9 KiB
YAML
73 lines
1.9 KiB
YAML
# RUN: llc -mtriple=aarch64--- -run-pass=machine-outliner \
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# RUN: -verify-machineinstrs %s -o - | FileCheck %s
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# Ensure that we never outline calls into sequences where unsafe stack
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# instructions are present.
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--- |
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define void @foo() #0 { ret void }
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define void @bar() #0 { ret void }
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define void @baz() #0 { ret void }
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define void @f1() #0 { ret void }
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define void @f2() #0 { ret void }
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attributes #0 = { minsize noinline noredzone "no-frame-pointer-elim"="true" }
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...
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---
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name: f1
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $lr
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; CHECK-LABEL: name: f1
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; CHECK: foo
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; CHECK-DAG: bar
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; CHECK-DAG: baz
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$lr = ORRXri $xzr, 1
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BL @foo, implicit-def dead $lr, implicit $sp
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$x20, $x19 = LDPXi $sp, 255
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$x20, $x19 = LDPXi $sp, 255
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$x20, $x19 = LDPXi $sp, 255
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$x20, $x19 = LDPXi $sp, 255
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bb.1:
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BL @bar, implicit-def dead $lr, implicit $sp
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$x11 = ADDXri $sp, 48, 0;
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$x12 = ADDXri $sp, 48, 0;
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$x13 = ADDXri $sp, 48, 0;
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$x14 = ADDXri $sp, 48, 0;
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bb.2:
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BL @baz, implicit-def dead $lr, implicit $sp
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$x0 = ADDXri $sp, 48, 0;
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$x1 = ADDXri $sp, 48, 0;
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RET undef $lr
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...
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---
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name: f2
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tracksRegLiveness: true
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body: |
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bb.0:
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liveins: $lr
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; CHECK-LABEL: name: f2
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; CHECK: foo
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; CHECK-DAG: bar
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; CHECK-DAG: baz
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$lr = ORRXri $xzr, 1
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BL @foo, implicit-def dead $lr, implicit $sp
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$x20, $x19 = LDPXi $sp, 255
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$x20, $x19 = LDPXi $sp, 255
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$x20, $x19 = LDPXi $sp, 255
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$x20, $x19 = LDPXi $sp, 255
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bb.1:
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BL @bar, implicit-def dead $lr, implicit $sp
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$x11 = ADDXri $sp, 48, 0;
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$x12 = ADDXri $sp, 48, 0;
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$x13 = ADDXri $sp, 48, 0;
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$x14 = ADDXri $sp, 48, 0;
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bb.2:
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BL @baz, implicit-def dead $lr, implicit $sp
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$x0 = ADDXri $sp, 48, 0;
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$x1 = ADDXri $sp, 48, 0;
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RET undef $lr
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