# REQUIRES: asserts
# RUN: llc -mtriple=aarch64--linux-gnu -run-pass=branch-relaxation -debug-only=branch-relaxation %s -o /dev/null 2>&1 | FileCheck %s
# Ensure meta instructions (e.g. CFI_INSTRUCTION) don't contribute to the code
# size of a basic block.
# CHECK: Basic blocks before relaxation
# CHECK-NEXT: %bb.0 offset=00000000 size=0x18
# CHECK-NEXT: %bb.1 offset=00000018 size=0x4
# CHECK-NEXT: %bb.2 offset=0000001c size=0xc
--- |
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64--linux-gnu"
define i32 @test(ptr %a) #0 {
entry:
%call = tail call i32 @validate(ptr %a)
%tobool = icmp eq i32 %call, 0
br i1 %tobool, label %return, label %if.then
if.then: ; preds = %entry
%0 = load i32, ptr %a, align 4
br label %return
return: ; preds = %entry, %if.then
%retval.0 = phi i32 [ %0, %if.then ], [ 0, %entry ]
ret i32 %retval.0
}
declare i32 @validate(ptr)
attributes #0 = { nounwind uwtable "disable-tail-calls"="false" "frame-pointer"="all" }
...
---
name: test
alignment: 4
tracksRegLiveness: true
liveins:
- { reg: '$x0' }
frameInfo:
stackSize: 32
maxAlignment: 16
adjustsStack: true
hasCalls: true
maxCallFrameSize: 0
stack:
- { id: 0, type: spill-slot, offset: -8, size: 8, alignment: 8, callee-saved-register: '$lr' }
- { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 8, callee-saved-register: '$fp' }
- { id: 2, type: spill-slot, offset: -32, size: 8, alignment: 16, callee-saved-register: '$x19' }
body: |
bb.0.entry:
successors: %bb.2(0x30000000), %bb.1(0x50000000)
liveins: $x0, $x19, $lr
early-clobber $sp = frame-setup STRXpre killed $x19, $sp, -32 :: (store (s64) into %stack.2)
frame-setup STPXi $fp, killed $lr, $sp, 2 :: (store (s64) into %stack.1), (store (s64) into %stack.0)
$fp = frame-setup ADDXri $sp, 16, 0
frame-setup CFI_INSTRUCTION def_cfa $w29, 16
frame-setup CFI_INSTRUCTION offset $w30, -8
frame-setup CFI_INSTRUCTION offset $w29, -16
frame-setup CFI_INSTRUCTION offset $w19, -32
$x19 = ORRXrs $xzr, $x0, 0
BL @validate, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $x0, implicit-def $sp, implicit-def $w0
CBZW renamable $w0, %bb.2
bb.1.if.then:
liveins: $x19
renamable $w0 = LDRWui killed renamable $x19, 0 :: (load (s32) from %ir.a)
bb.2.return:
liveins: $w0
$fp, $lr = frame-destroy LDPXi $sp, 2 :: (load (s64) from %stack.1), (load (s64) from %stack.0)
early-clobber $sp, $x19 = frame-destroy LDRXpost $sp, 32 :: (load (s64) from %stack.2)
RET undef $lr, implicit killed $w0
...
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