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| # RUN: llc -mtriple=x86_64-- -verify-machineinstrs -run-pass block-placement -o - %s | FileCheck %s
# Check the conditional jump in bb.1 is changed to unconditional after block placement swaps bb.2 and bb.3.
--- |
@a = external global i16
@b = external global i32
declare void @dummy1()
declare void @dummy2()
declare void @dummy3()
; Function Attrs: nounwind
define void @f2() {
br i1 undef, label %bb1, label %bb3
bb1:
call void @dummy1()
call void @dummy1()
call void @dummy1()
br i1 undef, label %bb2, label %bb2
bb2:
call void @dummy2()
call void @dummy2()
call void @dummy2()
br label %bb4
bb3:
call void @dummy3()
call void @dummy3()
call void @dummy3()
br label %bb2
bb4:
ret void
}
...
---
# CHECK-LABEL: name: f2
# CHECK: bb.1:
# CHECK: JMP_1 %bb.2
# CHECK: bb.3:
# CHECK: bb.2:
name: f2
body: |
bb.0 (%ir-block.0):
successors: %bb.1(50), %bb.3(50)
JCC_1 %bb.1, 2, implicit $eflags
JMP_1 %bb.3
bb.1:
successors: %bb.2(100)
CALL64pcrel32 @dummy1, csr_64, implicit $rsp, implicit-def $rsp
CALL64pcrel32 @dummy1, csr_64, implicit $rsp, implicit-def $rsp
CALL64pcrel32 @dummy1, csr_64, implicit $rsp, implicit-def $rsp
JCC_1 %bb.2, 5, implicit $eflags
bb.2:
successors: %bb.4(100)
CALL64pcrel32 @dummy2, csr_64, implicit $rsp, implicit-def $rsp
CALL64pcrel32 @dummy2, csr_64, implicit $rsp, implicit-def $rsp
CALL64pcrel32 @dummy2, csr_64, implicit $rsp, implicit-def $rsp
JMP_1 %bb.4
bb.3:
successors: %bb.2(100)
CALL64pcrel32 @dummy3, csr_64, implicit $rsp, implicit-def $rsp
CALL64pcrel32 @dummy3, csr_64, implicit $rsp, implicit-def $rsp
CALL64pcrel32 @dummy3, csr_64, implicit $rsp, implicit-def $rsp
JMP_1 %bb.2
bb.4:
RETQ
...
|