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TheRock/compiler/amd-llvm/llvm/test/CodeGen/X86/memset-minsize.ll
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Flatten subprojects into a single base monorepo
2026-09-02 16:34:47 -07:00

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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s
define void @tiny_memset_to_rep_stos(ptr %ptr) minsize nounwind {
; CHECK-LABEL: tiny_memset_to_rep_stos:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: andq $0, (%rdi)
; CHECK-NEXT: retq
entry:
call void @llvm.memset.p0.i32(ptr align 4 %ptr, i8 0, i32 8, i1 false)
ret void
}
define void @small_memset_to_rep_stos(ptr %ptr) minsize nounwind {
; CHECK-LABEL: small_memset_to_rep_stos:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: pushq $32
; CHECK-NEXT: popq %rcx
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: rep;stosl %eax, %es:(%rdi)
; CHECK-NEXT: retq
entry:
call void @llvm.memset.p0.i32(ptr align 4 %ptr, i8 0, i32 128, i1 false)
ret void
}
define void @medium_memset_to_rep_stos(ptr %ptr) minsize nounwind {
; CHECK-LABEL: medium_memset_to_rep_stos:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: movl $128, %ecx
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: rep;stosl %eax, %es:(%rdi)
; CHECK-NEXT: retq
entry:
call void @llvm.memset.p0.i32(ptr align 4 %ptr, i8 0, i32 512, i1 false)
ret void
}
define void @large_memset_to_rep_stos(ptr %ptr) minsize nounwind {
; CHECK-LABEL: large_memset_to_rep_stos:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: movl $1024, %ecx # imm = 0x400
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: rep;stosl %eax, %es:(%rdi)
; CHECK-NEXT: retq
entry:
call void @llvm.memset.p0.i32(ptr align 4 %ptr, i8 0, i32 4096, i1 false)
ret void
}
define void @huge_memset_to_rep_stos(ptr %ptr) minsize nounwind {
; CHECK-LABEL: huge_memset_to_rep_stos:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: movl $2048, %ecx # imm = 0x800
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: rep;stosl %eax, %es:(%rdi)
; CHECK-NEXT: retq
entry:
call void @llvm.memset.p0.i32(ptr align 4 %ptr, i8 0, i32 8192, i1 false)
ret void
}
define void @odd_length_memset_to_rep_stos(ptr %ptr) minsize nounwind {
; CHECK-LABEL: odd_length_memset_to_rep_stos:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: movl $255, %ecx
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: rep;stosb %al, %es:(%rdi)
; CHECK-NEXT: retq
entry:
call void @llvm.memset.p0.i32(ptr align 4 %ptr, i8 0, i32 255, i1 false)
ret void
}
define void @align_1_memset_to_rep_stos(ptr %ptr) minsize nounwind {
; CHECK-LABEL: align_1_memset_to_rep_stos:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: pushq $64
; CHECK-NEXT: popq %rcx
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: rep;stosl %eax, %es:(%rdi)
; CHECK-NEXT: retq
entry:
call void @llvm.memset.p0.i32(ptr align 1 %ptr, i8 0, i32 256, i1 false)
ret void
}
define void @align_2_memset_to_rep_stos(ptr %ptr) minsize nounwind {
; CHECK-LABEL: align_2_memset_to_rep_stos:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: pushq $64
; CHECK-NEXT: popq %rcx
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: rep;stosl %eax, %es:(%rdi)
; CHECK-NEXT: retq
entry:
call void @llvm.memset.p0.i32(ptr align 2 %ptr, i8 0, i32 256, i1 false)
ret void
}
define void @align_4_memset_to_rep_stos(ptr %ptr) minsize nounwind {
; CHECK-LABEL: align_4_memset_to_rep_stos:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: pushq $64
; CHECK-NEXT: popq %rcx
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: rep;stosl %eax, %es:(%rdi)
; CHECK-NEXT: retq
entry:
call void @llvm.memset.p0.i32(ptr align 4 %ptr, i8 0, i32 256, i1 false)
ret void
}
define void @align_8_memset_to_rep_stos(ptr %ptr) minsize nounwind {
; CHECK-LABEL: align_8_memset_to_rep_stos:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: pushq $64
; CHECK-NEXT: popq %rcx
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: rep;stosl %eax, %es:(%rdi)
; CHECK-NEXT: retq
entry:
call void @llvm.memset.p0.i32(ptr align 8 %ptr, i8 0, i32 256, i1 false)
ret void
}
define void @small_memset_to_rep_stos_64(ptr %ptr) minsize nounwind {
; CHECK-LABEL: small_memset_to_rep_stos_64:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: pushq $32
; CHECK-NEXT: popq %rcx
; CHECK-NEXT: xorl %eax, %eax
; CHECK-NEXT: rep;stosl %eax, %es:(%rdi)
; CHECK-NEXT: retq
entry:
call void @llvm.memset.p0.i64(ptr align 8 %ptr, i8 0, i64 128, i1 false)
ret void
}
declare void @llvm.memset.p0.i32(ptr nocapture writeonly, i8, i32, i1)
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