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llvm-project/llvm/test/CodeGen/X86/reverse_branches.ll

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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
@.str2 = private unnamed_addr constant [7 x i8] c"memchr\00", align 1
@.str3 = private unnamed_addr constant [11 x i8] c"bsd_memchr\00", align 1
@str4 = private unnamed_addr constant [5 x i8] c"Bug!\00"
; Make sure at end of do.cond.i, we jump to do.body.i first to have a tighter
; inner loop.
define i32 @test_branches_order() uwtable ssp {
; CHECK-LABEL: test_branches_order:
; CHECK: ## %bb.0: ## %entry
; CHECK-NEXT: pushq %rbp
; CHECK-NEXT: .cfi_def_cfa_offset 16
; CHECK-NEXT: pushq %r15
; CHECK-NEXT: .cfi_def_cfa_offset 24
; CHECK-NEXT: pushq %r14
; CHECK-NEXT: .cfi_def_cfa_offset 32
; CHECK-NEXT: pushq %r13
; CHECK-NEXT: .cfi_def_cfa_offset 40
; CHECK-NEXT: pushq %r12
; CHECK-NEXT: .cfi_def_cfa_offset 48
; CHECK-NEXT: pushq %rbx
; CHECK-NEXT: .cfi_def_cfa_offset 56
; CHECK-NEXT: subq $1001016, %rsp ## imm = 0xF4638
; CHECK-NEXT: .cfi_def_cfa_offset 1001072
; CHECK-NEXT: .cfi_offset %rbx, -56
; CHECK-NEXT: .cfi_offset %r12, -48
; CHECK-NEXT: .cfi_offset %r13, -40
; CHECK-NEXT: .cfi_offset %r14, -32
; CHECK-NEXT: .cfi_offset %r15, -24
; CHECK-NEXT: .cfi_offset %rbp, -16
; CHECK-NEXT: movq ___stack_chk_guard@{{.*}}(%rip), %rax
; CHECK-NEXT: movq (%rax), %rax
; CHECK-NEXT: movq %rax, {{[0-9]+}}(%rsp)
; CHECK-NEXT: xorl %r12d, %r12d
; CHECK-NEXT: leaq -{{[0-9]+}}(%rsp), %r14
; CHECK-NEXT: movq %rsp, %r15
; CHECK-NEXT: cmpl $999, %r12d ## imm = 0x3E7
; CHECK-NEXT: jle LBB0_2
; CHECK-NEXT: jmp LBB0_7
; CHECK-NEXT: .p2align 4, 0x90
; CHECK-NEXT: LBB0_6: ## %for.inc9
; CHECK-NEXT: ## in Loop: Header=BB0_2 Depth=1
; CHECK-NEXT: incl %r12d
; CHECK-NEXT: cmpl $999, %r12d ## imm = 0x3E7
; CHECK-NEXT: jg LBB0_7
; CHECK-NEXT: LBB0_2: ## %for.cond1.preheader
; CHECK-NEXT: ## =>This Loop Header: Depth=1
; CHECK-NEXT: ## Child Loop BB0_3 Depth 2
; CHECK-NEXT: movl $-1, %r13d
; CHECK-NEXT: movq %r15, %rbx
; CHECK-NEXT: movq %r14, %rbp
; CHECK-NEXT: .p2align 4, 0x90
; CHECK-NEXT: LBB0_3: ## %for.cond1
; CHECK-NEXT: ## Parent Loop BB0_2 Depth=1
; CHECK-NEXT: ## => This Inner Loop Header: Depth=2
; CHECK-NEXT: incl %r13d
; CHECK-NEXT: cmpl $999, %r13d ## imm = 0x3E7
; CHECK-NEXT: jg LBB0_6
; CHECK-NEXT: ## %bb.4: ## %for.body3
; CHECK-NEXT: ## in Loop: Header=BB0_3 Depth=2
; CHECK-NEXT: addq $1002, %rbp ## imm = 0x3EA
; CHECK-NEXT: movq %rbx, %rdi
; CHECK-NEXT: leaq 1001(%rbx), %rbx
; CHECK-NEXT: movl $1000, %edx ## imm = 0x3E8
; CHECK-NEXT: movl $120, %esi
; CHECK-NEXT: callq _memchr
; CHECK-NEXT: cmpq %rax, %rbp
; CHECK-NEXT: je LBB0_3
; CHECK-NEXT: jmp LBB0_5
; CHECK-NEXT: LBB0_7: ## %for.end11
; CHECK-NEXT: leaq {{.*}}(%rip), %rdi
; CHECK-NEXT: callq _puts
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: movq %rsp, %rcx
; CHECK-NEXT: cmpl $999, %eax ## imm = 0x3E7
; CHECK-NEXT: jle LBB0_9
; CHECK-NEXT: jmp LBB0_16
; CHECK-NEXT: .p2align 4, 0x90
; CHECK-NEXT: LBB0_15: ## %for.inc38
; CHECK-NEXT: ## in Loop: Header=BB0_9 Depth=1
; CHECK-NEXT: incl %eax
; CHECK-NEXT: cmpl $999, %eax ## imm = 0x3E7
; CHECK-NEXT: jg LBB0_16
; CHECK-NEXT: LBB0_9: ## %for.cond18.preheader
; CHECK-NEXT: ## =>This Loop Header: Depth=1
; CHECK-NEXT: ## Child Loop BB0_10 Depth 2
; CHECK-NEXT: ## Child Loop BB0_12 Depth 3
; CHECK-NEXT: movq %rcx, %rdx
; CHECK-NEXT: xorl %esi, %esi
; CHECK-NEXT: xorl %edi, %edi
; CHECK-NEXT: .p2align 4, 0x90
; CHECK-NEXT: LBB0_10: ## %for.cond18
; CHECK-NEXT: ## Parent Loop BB0_9 Depth=1
; CHECK-NEXT: ## => This Loop Header: Depth=2
; CHECK-NEXT: ## Child Loop BB0_12 Depth 3
; CHECK-NEXT: cmpl $999, %edi ## imm = 0x3E7
; CHECK-NEXT: jg LBB0_15
; CHECK-NEXT: ## %bb.11: ## %for.body20
; CHECK-NEXT: ## in Loop: Header=BB0_10 Depth=2
; CHECK-NEXT: movq $-1000, %rbp ## imm = 0xFC18
; CHECK-NEXT: .p2align 4, 0x90
; CHECK-NEXT: LBB0_12: ## %do.body.i
; CHECK-NEXT: ## Parent Loop BB0_9 Depth=1
; CHECK-NEXT: ## Parent Loop BB0_10 Depth=2
; CHECK-NEXT: ## => This Inner Loop Header: Depth=3
; CHECK-NEXT: cmpb $120, 1000(%rdx,%rbp)
; CHECK-NEXT: je LBB0_14
; CHECK-NEXT: ## %bb.13: ## %do.cond.i
; CHECK-NEXT: ## in Loop: Header=BB0_12 Depth=3
; CHECK-NEXT: incq %rbp
; CHECK-NEXT: jne LBB0_12
; CHECK-NEXT: jmp LBB0_5
; CHECK-NEXT: .p2align 4, 0x90
; CHECK-NEXT: LBB0_14: ## %exit
; CHECK-NEXT: ## in Loop: Header=BB0_10 Depth=2
; CHECK-NEXT: addq %rsi, %rbp
; CHECK-NEXT: incq %rdi
; CHECK-NEXT: decq %rsi
; CHECK-NEXT: addq $1001, %rdx ## imm = 0x3E9
; CHECK-NEXT: cmpq $-1000, %rbp ## imm = 0xFC18
; CHECK-NEXT: je LBB0_10
; CHECK-NEXT: LBB0_5: ## %if.then
; CHECK-NEXT: leaq {{.*}}(%rip), %rdi
; CHECK-NEXT: callq _puts
; CHECK-NEXT: movl $1, %edi
; CHECK-NEXT: callq _exit
; CHECK-NEXT: LBB0_16: ## %for.end40
; CHECK-NEXT: leaq {{.*}}(%rip), %rdi
; CHECK-NEXT: callq _puts
; CHECK-NEXT: movq ___stack_chk_guard@{{.*}}(%rip), %rax
; CHECK-NEXT: movq (%rax), %rax
; CHECK-NEXT: cmpq {{[0-9]+}}(%rsp), %rax
; CHECK-NEXT: jne LBB0_18
; CHECK-NEXT: ## %bb.17: ## %for.end40
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: addq $1001016, %rsp ## imm = 0xF4638
; CHECK-NEXT: popq %rbx
; CHECK-NEXT: popq %r12
; CHECK-NEXT: popq %r13
; CHECK-NEXT: popq %r14
; CHECK-NEXT: popq %r15
; CHECK-NEXT: popq %rbp
; CHECK-NEXT: retq
; CHECK-NEXT: LBB0_18: ## %for.end40
; CHECK-NEXT: callq ___stack_chk_fail
entry:
%strs = alloca [1000 x [1001 x i8]], align 16
br label %for.cond
for.cond:
%j.0 = phi i32 [ 0, %entry ], [ %inc10, %for.inc9 ]
%cmp = icmp slt i32 %j.0, 1000
br i1 %cmp, label %for.cond1, label %for.end11
for.cond1:
%indvars.iv50 = phi i64 [ %indvars.iv.next51, %for.body3 ], [ 0, %for.cond ]
%0 = trunc i64 %indvars.iv50 to i32
%cmp2 = icmp slt i32 %0, 1000
br i1 %cmp2, label %for.body3, label %for.inc9
for.body3:
%arraydecay = getelementptr inbounds [1000 x [1001 x i8]], [1000 x [1001 x i8]]* %strs, i64 0, i64 %indvars.iv50, i64 0
%call = call i8* @memchr(i8* %arraydecay, i32 120, i64 1000)
%add.ptr = getelementptr inbounds [1000 x [1001 x i8]], [1000 x [1001 x i8]]* %strs, i64 0, i64 %indvars.iv50, i64 %indvars.iv50
%cmp7 = icmp eq i8* %call, %add.ptr
%indvars.iv.next51 = add i64 %indvars.iv50, 1
br i1 %cmp7, label %for.cond1, label %if.then
if.then:
%puts = call i32 @puts(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @str4, i64 0, i64 0))
call void @exit(i32 1) noreturn
unreachable
for.inc9:
%inc10 = add nsw i32 %j.0, 1
br label %for.cond
for.end11:
%puts42 = call i32 @puts(i8* getelementptr inbounds ([7 x i8], [7 x i8]* @.str2, i64 0, i64 0))
br label %for.cond14
for.cond14:
%j13.0 = phi i32 [ 0, %for.end11 ], [ %inc39, %for.inc38 ]
%cmp15 = icmp slt i32 %j13.0, 1000
br i1 %cmp15, label %for.cond18, label %for.end40
for.cond18:
%indvars.iv = phi i64 [ %indvars.iv.next, %exit ], [ 0, %for.cond14 ]
%1 = trunc i64 %indvars.iv to i32
%cmp19 = icmp slt i32 %1, 1000
br i1 %cmp19, label %for.body20, label %for.inc38
for.body20:
%arraydecay24 = getelementptr inbounds [1000 x [1001 x i8]], [1000 x [1001 x i8]]* %strs, i64 0, i64 %indvars.iv, i64 0
br label %do.body.i
do.body.i:
%n.addr.0.i = phi i64 [ %dec.i, %do.cond.i ], [ 1000, %for.body20 ]
%p.0.i = phi i8* [ %incdec.ptr.i, %do.cond.i ], [ %arraydecay24, %for.body20 ]
%2 = load i8, i8* %p.0.i, align 1
%cmp3.i = icmp eq i8 %2, 120
br i1 %cmp3.i, label %exit, label %do.cond.i
do.cond.i:
%incdec.ptr.i = getelementptr inbounds i8, i8* %p.0.i, i64 1
%dec.i = add i64 %n.addr.0.i, -1
%cmp5.i = icmp eq i64 %dec.i, 0
br i1 %cmp5.i, label %if.then32, label %do.body.i
exit:
%add.ptr30 = getelementptr inbounds [1000 x [1001 x i8]], [1000 x [1001 x i8]]* %strs, i64 0, i64 %indvars.iv, i64 %indvars.iv
%cmp31 = icmp eq i8* %p.0.i, %add.ptr30
%indvars.iv.next = add i64 %indvars.iv, 1
br i1 %cmp31, label %for.cond18, label %if.then32
if.then32:
%puts43 = call i32 @puts(i8* getelementptr inbounds ([5 x i8], [5 x i8]* @str4, i64 0, i64 0))
call void @exit(i32 1) noreturn
unreachable
for.inc38:
%inc39 = add nsw i32 %j13.0, 1
br label %for.cond14
for.end40:
%puts44 = call i32 @puts(i8* getelementptr inbounds ([11 x i8], [11 x i8]* @.str3, i64 0, i64 0))
ret i32 0
}
declare i8* @memchr(i8*, i32, i64) nounwind readonly
declare void @exit(i32) noreturn
declare i32 @puts(i8* nocapture) nounwind
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