[x86] add tests to show current memset codegen

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264748 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGen/X86/memset-nonzero.ll

@@ -0,0 +1,88 @@
+; NOTE: Assertions have been autogenerated by update_test_checks.py
+; RUN: llc -mtriple=x86_64-unknown-unknown < %s -mattr=sse2 | FileCheck %s --check-prefix=ANY --check-prefix=SSE2
+; RUN: llc -mtriple=x86_64-unknown-unknown < %s -mattr=avx | FileCheck %s --check-prefix=ANY --check-prefix=AVX --check-prefix=AVX1
+; RUN: llc -mtriple=x86_64-unknown-unknown < %s -mattr=avx2 | FileCheck %s --check-prefix=ANY --check-prefix=AVX --check-prefix=AVX2
+
+define void @memset_16_nonzero_bytes(i8* %x) {
+; ANY-LABEL: memset_16_nonzero_bytes:
+; ANY:         movabsq $3038287259199220266, %rax # imm = 0x2A2A2A2A2A2A2A2A
+; ANY-NEXT:    movq %rax, 8(%rdi)
+; ANY-NEXT:    movq %rax, (%rdi)
+; ANY-NEXT:    retq
+;
+  %call = tail call i8* @__memset_chk(i8* %x, i32 42, i64 16, i64 -1)
+  ret void
+}
+
+define void @memset_32_nonzero_bytes(i8* %x) {
+; ANY-LABEL: memset_32_nonzero_bytes:
+; ANY:         movabsq $3038287259199220266, %rax # imm = 0x2A2A2A2A2A2A2A2A
+; ANY-NEXT:    movq %rax, 24(%rdi)
+; ANY-NEXT:    movq %rax, 16(%rdi)
+; ANY-NEXT:    movq %rax, 8(%rdi)
+; ANY-NEXT:    movq %rax, (%rdi)
+; ANY-NEXT:    retq
+;
+  %call = tail call i8* @__memset_chk(i8* %x, i32 42, i64 32, i64 -1)
+  ret void
+}
+
+define void @memset_64_nonzero_bytes(i8* %x) {
+; ANY-LABEL: memset_64_nonzero_bytes:
+; ANY:         movabsq $3038287259199220266, %rax # imm = 0x2A2A2A2A2A2A2A2A
+; ANY-NEXT:    movq %rax, 56(%rdi)
+; ANY-NEXT:    movq %rax, 48(%rdi)
+; ANY-NEXT:    movq %rax, 40(%rdi)
+; ANY-NEXT:    movq %rax, 32(%rdi)
+; ANY-NEXT:    movq %rax, 24(%rdi)
+; ANY-NEXT:    movq %rax, 16(%rdi)
+; ANY-NEXT:    movq %rax, 8(%rdi)
+; ANY-NEXT:    movq %rax, (%rdi)
+; ANY-NEXT:    retq
+;
+  %call = tail call i8* @__memset_chk(i8* %x, i32 42, i64 64, i64 -1)
+  ret void
+}
+
+define void @memset_128_nonzero_bytes(i8* %x) {
+; ANY-LABEL: memset_128_nonzero_bytes:
+; ANY:         movabsq $3038287259199220266, %rax # imm = 0x2A2A2A2A2A2A2A2A
+; ANY-NEXT:    movq %rax, 120(%rdi)
+; ANY-NEXT:    movq %rax, 112(%rdi)
+; ANY-NEXT:    movq %rax, 104(%rdi)
+; ANY-NEXT:    movq %rax, 96(%rdi)
+; ANY-NEXT:    movq %rax, 88(%rdi)
+; ANY-NEXT:    movq %rax, 80(%rdi)
+; ANY-NEXT:    movq %rax, 72(%rdi)
+; ANY-NEXT:    movq %rax, 64(%rdi)
+; ANY-NEXT:    movq %rax, 56(%rdi)
+; ANY-NEXT:    movq %rax, 48(%rdi)
+; ANY-NEXT:    movq %rax, 40(%rdi)
+; ANY-NEXT:    movq %rax, 32(%rdi)
+; ANY-NEXT:    movq %rax, 24(%rdi)
+; ANY-NEXT:    movq %rax, 16(%rdi)
+; ANY-NEXT:    movq %rax, 8(%rdi)
+; ANY-NEXT:    movq %rax, (%rdi)
+; ANY-NEXT:    retq
+;
+  %call = tail call i8* @__memset_chk(i8* %x, i32 42, i64 128, i64 -1)
+  ret void
+}
+
+define void @memset_256_nonzero_bytes(i8* %x) {
+; ANY-LABEL: memset_256_nonzero_bytes:
+; ANY:         pushq %rax
+; ANY-NEXT:  .Ltmp0:
+; ANY-NEXT:    .cfi_def_cfa_offset 16
+; ANY-NEXT:    movl $42, %esi
+; ANY-NEXT:    movl $256, %edx # imm = 0x100
+; ANY-NEXT:    callq memset
+; ANY-NEXT:    popq %rax
+; ANY-NEXT:    retq
+;
+  %call = tail call i8* @__memset_chk(i8* %x, i32 42, i64 256, i64 -1)
+  ret void
+}
+
+declare i8* @__memset_chk(i8*, i32, i64, i64)
+