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

460 lines
15 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-- -mattr=+sse4.2 | FileCheck %s
; Verify when widening a divide/remainder operation, we only generate a
; divide/rem per element since divide/remainder can trap.
; CHECK: vectorDiv
define void @vectorDiv (<2 x i32> addrspace(1)* %nsource, <2 x i32> addrspace(1)* %dsource, <2 x i32> addrspace(1)* %qdest) nounwind {
; CHECK-LABEL: vectorDiv:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: movq %rdx, %r8
; CHECK-NEXT: movq %rdi, -{{[0-9]+}}(%rsp)
; CHECK-NEXT: movq %rsi, -{{[0-9]+}}(%rsp)
; CHECK-NEXT: movq %r8, -{{[0-9]+}}(%rsp)
; CHECK-NEXT: movslq -{{[0-9]+}}(%rsp), %rcx
; CHECK-NEXT: pmovsxdq (%rdi,%rcx,8), %xmm0
; CHECK-NEXT: pmovsxdq (%rsi,%rcx,8), %xmm1
; CHECK-NEXT: pextrq $1, %xmm0, %rax
; CHECK-NEXT: pextrq $1, %xmm1, %rsi
; CHECK-NEXT: cqto
; CHECK-NEXT: idivq %rsi
; CHECK-NEXT: movq %rax, %xmm2
; CHECK-NEXT: movq %xmm0, %rax
; CHECK-NEXT: movq %xmm1, %rsi
; CHECK-NEXT: cqto
; CHECK-NEXT: idivq %rsi
; CHECK-NEXT: movq %rax, %xmm0
; CHECK-NEXT: punpcklqdq {{.*#+}} xmm0 = xmm0[0],xmm2[0]
; CHECK-NEXT: pshufd {{.*#+}} xmm0 = xmm0[0,2,2,3]
; CHECK-NEXT: movq %xmm0, (%r8,%rcx,8)
; CHECK-NEXT: retq
entry:
%nsource.addr = alloca <2 x i32> addrspace(1)*, align 4
%dsource.addr = alloca <2 x i32> addrspace(1)*, align 4
%qdest.addr = alloca <2 x i32> addrspace(1)*, align 4
%index = alloca i32, align 4
store <2 x i32> addrspace(1)* %nsource, <2 x i32> addrspace(1)** %nsource.addr
store <2 x i32> addrspace(1)* %dsource, <2 x i32> addrspace(1)** %dsource.addr
store <2 x i32> addrspace(1)* %qdest, <2 x i32> addrspace(1)** %qdest.addr
%tmp = load <2 x i32> addrspace(1)*, <2 x i32> addrspace(1)** %qdest.addr
%tmp1 = load i32, i32* %index
%arrayidx = getelementptr <2 x i32>, <2 x i32> addrspace(1)* %tmp, i32 %tmp1
%tmp2 = load <2 x i32> addrspace(1)*, <2 x i32> addrspace(1)** %nsource.addr
%tmp3 = load i32, i32* %index
%arrayidx4 = getelementptr <2 x i32>, <2 x i32> addrspace(1)* %tmp2, i32 %tmp3
%tmp5 = load <2 x i32>, <2 x i32> addrspace(1)* %arrayidx4
%tmp6 = load <2 x i32> addrspace(1)*, <2 x i32> addrspace(1)** %dsource.addr
%tmp7 = load i32, i32* %index
%arrayidx8 = getelementptr <2 x i32>, <2 x i32> addrspace(1)* %tmp6, i32 %tmp7
%tmp9 = load <2 x i32>, <2 x i32> addrspace(1)* %arrayidx8
%tmp10 = sdiv <2 x i32> %tmp5, %tmp9
store <2 x i32> %tmp10, <2 x i32> addrspace(1)* %arrayidx
ret void
}
; CHECK: test_char_div
define <3 x i8> @test_char_div(<3 x i8> %num, <3 x i8> %div) {
; CHECK-LABEL: test_char_div:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: cbtw
; CHECK-NEXT: idivb %cl
; CHECK-NEXT: movl %eax, %edi
; CHECK-NEXT: movl %esi, %eax
; CHECK-NEXT: cbtw
; CHECK-NEXT: idivb %r8b
; CHECK-NEXT: movl %eax, %esi
; CHECK-NEXT: movl %edx, %eax
; CHECK-NEXT: cbtw
; CHECK-NEXT: idivb %r9b
; CHECK-NEXT: movl %eax, %ecx
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: movl %esi, %edx
; CHECK-NEXT: retq
%div.r = sdiv <3 x i8> %num, %div
ret <3 x i8> %div.r
}
; CHECK: test_uchar_div
define <3 x i8> @test_uchar_div(<3 x i8> %num, <3 x i8> %div) {
; CHECK-LABEL: test_uchar_div:
; CHECK: # %bb.0:
; CHECK-NEXT: movzbl %dil, %eax
; CHECK-NEXT: # kill: def %eax killed %eax def %ax
; CHECK-NEXT: divb %cl
; CHECK-NEXT: movl %eax, %edi
; CHECK-NEXT: movzbl %sil, %eax
; CHECK-NEXT: # kill: def %eax killed %eax def %ax
; CHECK-NEXT: divb %r8b
; CHECK-NEXT: movl %eax, %esi
; CHECK-NEXT: movzbl %dl, %eax
; CHECK-NEXT: # kill: def %eax killed %eax def %ax
; CHECK-NEXT: divb %r9b
; CHECK-NEXT: movl %eax, %ecx
; CHECK-NEXT: movl %edi, %eax
; CHECK-NEXT: movl %esi, %edx
; CHECK-NEXT: retq
%div.r = udiv <3 x i8> %num, %div
ret <3 x i8> %div.r
}
; CHECK: test_short_div
define <5 x i16> @test_short_div(<5 x i16> %num, <5 x i16> %div) {
; CHECK-LABEL: test_short_div:
; CHECK: # %bb.0:
; CHECK-NEXT: pextrw $4, %xmm0, %eax
; CHECK-NEXT: pextrw $4, %xmm1, %ecx
; CHECK-NEXT: # kill: def %ax killed %ax killed %eax
; CHECK-NEXT: cwtd
; CHECK-NEXT: idivw %cx
; CHECK-NEXT: movl %eax, %r8d
; CHECK-NEXT: pextrw $3, %xmm0, %eax
; CHECK-NEXT: pextrw $3, %xmm1, %ecx
; CHECK-NEXT: # kill: def %ax killed %ax killed %eax
; CHECK-NEXT: cwtd
; CHECK-NEXT: idivw %cx
; CHECK-NEXT: movl %eax, %r9d
; CHECK-NEXT: pextrw $2, %xmm0, %eax
; CHECK-NEXT: pextrw $2, %xmm1, %ecx
; CHECK-NEXT: # kill: def %ax killed %ax killed %eax
; CHECK-NEXT: cwtd
; CHECK-NEXT: idivw %cx
; CHECK-NEXT: movl %eax, %edi
; CHECK-NEXT: movd %xmm0, %eax
; CHECK-NEXT: movd %xmm1, %ecx
; CHECK-NEXT: # kill: def %ax killed %ax killed %eax
; CHECK-NEXT: cwtd
; CHECK-NEXT: idivw %cx
; CHECK-NEXT: movl %eax, %ecx
; CHECK-NEXT: pextrw $1, %xmm0, %eax
; CHECK-NEXT: pextrw $1, %xmm1, %esi
; CHECK-NEXT: # kill: def %ax killed %ax killed %eax
; CHECK-NEXT: cwtd
; CHECK-NEXT: idivw %si
; CHECK-NEXT: # kill: def %ax killed %ax def %eax
; CHECK-NEXT: movd %ecx, %xmm0
; CHECK-NEXT: pinsrw $1, %eax, %xmm0
; CHECK-NEXT: pinsrw $2, %edi, %xmm0
; CHECK-NEXT: pinsrw $3, %r9d, %xmm0
; CHECK-NEXT: pinsrw $4, %r8d, %xmm0
; CHECK-NEXT: retq
%div.r = sdiv <5 x i16> %num, %div
ret <5 x i16> %div.r
}
; CHECK: test_ushort_div
define <4 x i16> @test_ushort_div(<4 x i16> %num, <4 x i16> %div) {
; CHECK-LABEL: test_ushort_div:
; CHECK: # %bb.0:
; CHECK-NEXT: pxor %xmm2, %xmm2
; CHECK-NEXT: pblendw {{.*#+}} xmm1 = xmm1[0],xmm2[1],xmm1[2],xmm2[3],xmm1[4],xmm2[5],xmm1[6],xmm2[7]
; CHECK-NEXT: pblendw {{.*#+}} xmm0 = xmm0[0],xmm2[1],xmm0[2],xmm2[3],xmm0[4],xmm2[5],xmm0[6],xmm2[7]
; CHECK-NEXT: pextrd $1, %xmm0, %eax
; CHECK-NEXT: pextrd $1, %xmm1, %ecx
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: divl %ecx
; CHECK-NEXT: movl %eax, %ecx
; CHECK-NEXT: movd %xmm0, %eax
; CHECK-NEXT: movd %xmm1, %esi
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: divl %esi
; CHECK-NEXT: movd %eax, %xmm2
; CHECK-NEXT: pinsrd $1, %ecx, %xmm2
; CHECK-NEXT: pextrd $2, %xmm0, %eax
; CHECK-NEXT: pextrd $2, %xmm1, %ecx
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: divl %ecx
; CHECK-NEXT: pinsrd $2, %eax, %xmm2
; CHECK-NEXT: pextrd $3, %xmm0, %eax
; CHECK-NEXT: pextrd $3, %xmm1, %ecx
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: divl %ecx
; CHECK-NEXT: pinsrd $3, %eax, %xmm2
; CHECK-NEXT: movdqa %xmm2, %xmm0
; CHECK-NEXT: retq
%div.r = udiv <4 x i16> %num, %div
ret <4 x i16> %div.r
}
; CHECK: test_uint_div
define <3 x i32> @test_uint_div(<3 x i32> %num, <3 x i32> %div) {
; CHECK-LABEL: test_uint_div:
; CHECK: # %bb.0:
; CHECK-NEXT: pextrd $2, %xmm0, %eax
; CHECK-NEXT: pextrd $2, %xmm1, %ecx
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: divl %ecx
; CHECK-NEXT: movl %eax, %ecx
; CHECK-NEXT: pextrd $1, %xmm0, %eax
; CHECK-NEXT: pextrd $1, %xmm1, %esi
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: divl %esi
; CHECK-NEXT: movl %eax, %esi
; CHECK-NEXT: movd %xmm0, %eax
; CHECK-NEXT: movd %xmm1, %edi
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: divl %edi
; CHECK-NEXT: movd %eax, %xmm0
; CHECK-NEXT: pinsrd $1, %esi, %xmm0
; CHECK-NEXT: pinsrd $2, %ecx, %xmm0
; CHECK-NEXT: retq
%div.r = udiv <3 x i32> %num, %div
ret <3 x i32> %div.r
}
; CHECK: test_long_div
define <3 x i64> @test_long_div(<3 x i64> %num, <3 x i64> %div) {
; CHECK-LABEL: test_long_div:
; CHECK: # %bb.0:
; CHECK-NEXT: movq %rdx, %r10
; CHECK-NEXT: movq %rdi, %rax
; CHECK-NEXT: cqto
; CHECK-NEXT: idivq %rcx
; CHECK-NEXT: movq %rax, %rcx
; CHECK-NEXT: movq %rsi, %rax
; CHECK-NEXT: cqto
; CHECK-NEXT: idivq %r8
; CHECK-NEXT: movq %rax, %rsi
; CHECK-NEXT: movq %r10, %rax
; CHECK-NEXT: cqto
; CHECK-NEXT: idivq %r9
; CHECK-NEXT: movq %rax, %rdi
; CHECK-NEXT: movq %rcx, %rax
; CHECK-NEXT: movq %rsi, %rdx
; CHECK-NEXT: movq %rdi, %rcx
; CHECK-NEXT: retq
%div.r = sdiv <3 x i64> %num, %div
ret <3 x i64> %div.r
}
; CHECK: test_ulong_div
define <3 x i64> @test_ulong_div(<3 x i64> %num, <3 x i64> %div) {
; CHECK-LABEL: test_ulong_div:
; CHECK: # %bb.0:
; CHECK-NEXT: movq %rdx, %r10
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: movq %rdi, %rax
; CHECK-NEXT: divq %rcx
; CHECK-NEXT: movq %rax, %rcx
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: movq %rsi, %rax
; CHECK-NEXT: divq %r8
; CHECK-NEXT: movq %rax, %rsi
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: movq %r10, %rax
; CHECK-NEXT: divq %r9
; CHECK-NEXT: movq %rax, %rdi
; CHECK-NEXT: movq %rcx, %rax
; CHECK-NEXT: movq %rsi, %rdx
; CHECK-NEXT: movq %rdi, %rcx
; CHECK-NEXT: retq
%div.r = udiv <3 x i64> %num, %div
ret <3 x i64> %div.r
}
; CHECK: test_char_rem
define <4 x i8> @test_char_rem(<4 x i8> %num, <4 x i8> %rem) {
; CHECK-LABEL: test_char_rem:
; CHECK: # %bb.0:
; CHECK-NEXT: pslld $24, %xmm1
; CHECK-NEXT: psrad $24, %xmm1
; CHECK-NEXT: pslld $24, %xmm0
; CHECK-NEXT: psrad $24, %xmm0
; CHECK-NEXT: pextrd $1, %xmm0, %eax
; CHECK-NEXT: pextrd $1, %xmm1, %ecx
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %ecx
; CHECK-NEXT: movl %edx, %ecx
; CHECK-NEXT: movd %xmm0, %eax
; CHECK-NEXT: movd %xmm1, %esi
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %esi
; CHECK-NEXT: movd %edx, %xmm2
; CHECK-NEXT: pinsrd $1, %ecx, %xmm2
; CHECK-NEXT: pextrd $2, %xmm0, %eax
; CHECK-NEXT: pextrd $2, %xmm1, %ecx
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %ecx
; CHECK-NEXT: pinsrd $2, %edx, %xmm2
; CHECK-NEXT: pextrd $3, %xmm0, %eax
; CHECK-NEXT: pextrd $3, %xmm1, %ecx
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %ecx
; CHECK-NEXT: pinsrd $3, %edx, %xmm2
; CHECK-NEXT: movdqa %xmm2, %xmm0
; CHECK-NEXT: retq
%rem.r = srem <4 x i8> %num, %rem
ret <4 x i8> %rem.r
}
; CHECK: test_short_rem
define <5 x i16> @test_short_rem(<5 x i16> %num, <5 x i16> %rem) {
; CHECK-LABEL: test_short_rem:
; CHECK: # %bb.0:
; CHECK-NEXT: pextrw $4, %xmm0, %eax
; CHECK-NEXT: pextrw $4, %xmm1, %ecx
; CHECK-NEXT: # kill: def %ax killed %ax killed %eax
; CHECK-NEXT: cwtd
; CHECK-NEXT: idivw %cx
; CHECK-NEXT: movl %edx, %r8d
; CHECK-NEXT: pextrw $3, %xmm0, %eax
; CHECK-NEXT: pextrw $3, %xmm1, %ecx
; CHECK-NEXT: # kill: def %ax killed %ax killed %eax
; CHECK-NEXT: cwtd
; CHECK-NEXT: idivw %cx
; CHECK-NEXT: movl %edx, %r9d
; CHECK-NEXT: pextrw $2, %xmm0, %eax
; CHECK-NEXT: pextrw $2, %xmm1, %ecx
; CHECK-NEXT: # kill: def %ax killed %ax killed %eax
; CHECK-NEXT: cwtd
; CHECK-NEXT: idivw %cx
; CHECK-NEXT: movl %edx, %edi
; CHECK-NEXT: movd %xmm0, %eax
; CHECK-NEXT: movd %xmm1, %ecx
; CHECK-NEXT: # kill: def %ax killed %ax killed %eax
; CHECK-NEXT: cwtd
; CHECK-NEXT: idivw %cx
; CHECK-NEXT: movl %edx, %ecx
; CHECK-NEXT: pextrw $1, %xmm0, %eax
; CHECK-NEXT: pextrw $1, %xmm1, %esi
; CHECK-NEXT: # kill: def %ax killed %ax killed %eax
; CHECK-NEXT: cwtd
; CHECK-NEXT: idivw %si
; CHECK-NEXT: # kill: def %dx killed %dx def %edx
; CHECK-NEXT: movd %ecx, %xmm0
; CHECK-NEXT: pinsrw $1, %edx, %xmm0
; CHECK-NEXT: pinsrw $2, %edi, %xmm0
; CHECK-NEXT: pinsrw $3, %r9d, %xmm0
; CHECK-NEXT: pinsrw $4, %r8d, %xmm0
; CHECK-NEXT: retq
%rem.r = srem <5 x i16> %num, %rem
ret <5 x i16> %rem.r
}
; CHECK: test_uint_rem
define <4 x i32> @test_uint_rem(<4 x i32> %num, <4 x i32> %rem) {
; CHECK-LABEL: test_uint_rem:
; CHECK: # %bb.0:
; CHECK-NEXT: pextrd $1, %xmm0, %eax
; CHECK-NEXT: pextrd $1, %xmm1, %ecx
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %ecx
; CHECK-NEXT: movl %edx, %ecx
; CHECK-NEXT: movd %xmm0, %eax
; CHECK-NEXT: movd %xmm1, %esi
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %esi
; CHECK-NEXT: movd %edx, %xmm2
; CHECK-NEXT: pinsrd $1, %ecx, %xmm2
; CHECK-NEXT: pextrd $2, %xmm0, %eax
; CHECK-NEXT: pextrd $2, %xmm1, %ecx
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %ecx
; CHECK-NEXT: pinsrd $2, %edx, %xmm2
; CHECK-NEXT: pextrd $3, %xmm0, %eax
; CHECK-NEXT: pextrd $3, %xmm1, %ecx
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %ecx
; CHECK-NEXT: pinsrd $3, %edx, %xmm2
; CHECK-NEXT: movdqa %xmm2, %xmm0
; CHECK-NEXT: retq
%rem.r = srem <4 x i32> %num, %rem
ret <4 x i32> %rem.r
}
; CHECK: test_ulong_rem
define <5 x i64> @test_ulong_rem(<5 x i64> %num, <5 x i64> %rem) {
; CHECK-LABEL: test_ulong_rem:
; CHECK: # %bb.0:
; CHECK-NEXT: movq %rdx, %rax
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: divq {{[0-9]+}}(%rsp)
; CHECK-NEXT: movq %rdx, %xmm0
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: movq %rsi, %rax
; CHECK-NEXT: divq {{[0-9]+}}(%rsp)
; CHECK-NEXT: movq %rdx, %xmm1
; CHECK-NEXT: punpcklqdq {{.*#+}} xmm1 = xmm1[0],xmm0[0]
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: movq %r8, %rax
; CHECK-NEXT: divq {{[0-9]+}}(%rsp)
; CHECK-NEXT: movq %rdx, %xmm0
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: movq %rcx, %rax
; CHECK-NEXT: divq {{[0-9]+}}(%rsp)
; CHECK-NEXT: movq %rdx, %xmm2
; CHECK-NEXT: punpcklqdq {{.*#+}} xmm2 = xmm2[0],xmm0[0]
; CHECK-NEXT: xorl %edx, %edx
; CHECK-NEXT: movq %r9, %rax
; CHECK-NEXT: divq {{[0-9]+}}(%rsp)
; CHECK-NEXT: movq %rdx, 32(%rdi)
; CHECK-NEXT: movdqa %xmm2, 16(%rdi)
; CHECK-NEXT: movdqa %xmm1, (%rdi)
; CHECK-NEXT: movq %rdi, %rax
; CHECK-NEXT: retq
%rem.r = urem <5 x i64> %num, %rem
ret <5 x i64> %rem.r
}
; CHECK: test_int_div
define void @test_int_div(<3 x i32>* %dest, <3 x i32>* %old, i32 %n) {
; CHECK-LABEL: test_int_div:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: movl %edx, %r9d
; CHECK-NEXT: testl %r9d, %r9d
; CHECK-NEXT: jle .LBB12_3
; CHECK-NEXT: # %bb.1: # %bb.nph
; CHECK-NEXT: xorl %ecx, %ecx
; CHECK-NEXT: .p2align 4, 0x90
; CHECK-NEXT: .LBB12_2: # %for.body
; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
; CHECK-NEXT: movdqa (%rdi,%rcx), %xmm0
; CHECK-NEXT: movdqa (%rsi,%rcx), %xmm1
; CHECK-NEXT: pextrd $1, %xmm0, %eax
; CHECK-NEXT: pextrd $1, %xmm1, %r8d
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %r8d
; CHECK-NEXT: movl %eax, %r8d
; CHECK-NEXT: movd %xmm0, %eax
; CHECK-NEXT: movd %xmm1, %r10d
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %r10d
; CHECK-NEXT: movd %eax, %xmm2
; CHECK-NEXT: pinsrd $1, %r8d, %xmm2
; CHECK-NEXT: pextrd $2, %xmm0, %eax
; CHECK-NEXT: pextrd $2, %xmm1, %r8d
; CHECK-NEXT: cltd
; CHECK-NEXT: idivl %r8d
; CHECK-NEXT: pinsrd $2, %eax, %xmm2
; CHECK-NEXT: movl %eax, 8(%rdi,%rcx)
; CHECK-NEXT: movq %xmm2, (%rdi,%rcx)
; CHECK-NEXT: addq $16, %rcx
; CHECK-NEXT: decl %r9d
; CHECK-NEXT: jne .LBB12_2
; CHECK-NEXT: .LBB12_3: # %for.end
; CHECK-NEXT: retq
entry:
%cmp13 = icmp sgt i32 %n, 0
br i1 %cmp13, label %bb.nph, label %for.end
bb.nph:
br label %for.body
for.body:
%i.014 = phi i32 [ 0, %bb.nph ], [ %inc, %for.body ]
%arrayidx11 = getelementptr <3 x i32>, <3 x i32>* %dest, i32 %i.014
%tmp4 = load <3 x i32>, <3 x i32>* %arrayidx11 ; <<3 x i32>> [#uses=1]
%arrayidx7 = getelementptr inbounds <3 x i32>, <3 x i32>* %old, i32 %i.014
%tmp8 = load <3 x i32>, <3 x i32>* %arrayidx7 ; <<3 x i32>> [#uses=1]
%div = sdiv <3 x i32> %tmp4, %tmp8
store <3 x i32> %div, <3 x i32>* %arrayidx11
%inc = add nsw i32 %i.014, 1
%exitcond = icmp eq i32 %inc, %n
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body, %entry
ret void
}