Inline memset when there is a constant value and count.

tests_lit/llvm2ice_tests/nacl-mem-intrinsics.ll

+; This tests the NaCl intrinsics memset, memcpy and memmove.
+
+; RUN: %if --need=target_X8632 --command %p2i --filetype=obj --disassemble \
+; RUN:   --target x8632 -i %s --args -O2 -sandbox \
+; RUN:   | %if --need=target_X8632 --command FileCheck %s
+; RUN: %if --need=target_X8632 --command %p2i --filetype=obj --disassemble \
+; RUN:   --target x8632 -i %s --args -Om1 -sandbox \
+; RUN:   | %if --need=target_X8632 --command FileCheck %s
+
+; RUN: %if --need=target_ARM32 --need=allow_dump \
+; RUN:   --command %p2i --filetype=asm --assemble --disassemble --target arm32 \
+; RUN:   -i %s --args -O2 --skip-unimplemented \
+; RUN:   | %if --need=target_ARM32 --need=allow_dump \
+; RUN:   --command FileCheck --check-prefix ARM32 %s
+
+declare void @llvm.memcpy.p0i8.p0i8.i32(i8*, i8*, i32, i32, i1)
+declare void @llvm.memmove.p0i8.p0i8.i32(i8*, i8*, i32, i32, i1)
+declare void @llvm.memset.p0i8.i32(i8*, i8, i32, i32, i1)
+
+define void @test_memcpy(i32 %iptr_dst, i32 %iptr_src, i32 %len) {
+entry:
+  %dst = inttoptr i32 %iptr_dst to i8*
+  %src = inttoptr i32 %iptr_src to i8*
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %src,
+                                       i32 %len, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memcpy
+; CHECK: call {{.*}} R_{{.*}} memcpy
+; ARM32-LABEL: test_memcpy
+; ARM32: bl {{.*}} memcpy
+
+; TODO(jvoung) -- if we want to be clever, we can do this and the memmove,
+; memset without a function call.
+define void @test_memcpy_const_len_align(i32 %iptr_dst, i32 %iptr_src) {
+entry:
+  %dst = inttoptr i32 %iptr_dst to i8*
+  %src = inttoptr i32 %iptr_src to i8*
+  call void @llvm.memcpy.p0i8.p0i8.i32(i8* %dst, i8* %src,
+                                       i32 32, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memcpy_const_len_align
+; CHECK: call {{.*}} R_{{.*}} memcpy
+; ARM32-LABEL: test_memcpy_const_len_align
+; ARM32: bl {{.*}} memcpy
+
+define void @test_memmove(i32 %iptr_dst, i32 %iptr_src, i32 %len) {
+entry:
+  %dst = inttoptr i32 %iptr_dst to i8*
+  %src = inttoptr i32 %iptr_src to i8*
+  call void @llvm.memmove.p0i8.p0i8.i32(i8* %dst, i8* %src,
+                                        i32 %len, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memmove
+; CHECK: call {{.*}} R_{{.*}} memmove
+; ARM32-LABEL: test_memmove
+; ARM32: bl {{.*}} memmove
+
+define void @test_memmove_const_len_align(i32 %iptr_dst, i32 %iptr_src) {
+entry:
+  %dst = inttoptr i32 %iptr_dst to i8*
+  %src = inttoptr i32 %iptr_src to i8*
+  call void @llvm.memmove.p0i8.p0i8.i32(i8* %dst, i8* %src,
+                                        i32 32, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memmove_const_len_align
+; CHECK: call {{.*}} R_{{.*}} memmove
+; ARM32-LABEL: test_memmove_const_len_align
+; ARM32: bl {{.*}} memmove
+
+define void @test_memset(i32 %iptr_dst, i32 %wide_val, i32 %len) {
+entry:
+  %val = trunc i32 %wide_val to i8
+  %dst = inttoptr i32 %iptr_dst to i8*
+  call void @llvm.memset.p0i8.i32(i8* %dst, i8 %val,
+                                  i32 %len, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memset
+; CHECK: movzx
+; CHECK: call {{.*}} R_{{.*}} memset
+; ARM32-LABEL: test_memset
+; ARM32: uxtb
+; ARM32: bl {{.*}} memset
+
+define void @test_memset_const_len_align(i32 %iptr_dst, i32 %wide_val) {
+entry:
+  %val = trunc i32 %wide_val to i8
+  %dst = inttoptr i32 %iptr_dst to i8*
+  call void @llvm.memset.p0i8.i32(i8* %dst, i8 %val,
+                                  i32 32, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memset_const_len_align
+; CHECK: movzx
+; CHECK: call {{.*}} R_{{.*}} memset
+; ARM32-LABEL: test_memset_const_len_align
+; ARM32: uxtb
+; ARM32: bl {{.*}} memset
+
+define void @test_memset_const_val(i32 %iptr_dst, i32 %len) {
+entry:
+  %dst = inttoptr i32 %iptr_dst to i8*
+  call void @llvm.memset.p0i8.i32(i8* %dst, i8 0, i32 %len, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memset_const_val
+; CHECK-NOT: movzx
+; CHECK: call {{.*}} R_{{.*}} memset
+; ARM32-LABEL: test_memset_const_val
+; ARM32: uxtb
+; ARM32: bl {{.*}} memset
+
+define void @test_memset_const_val_len_very_small(i32 %iptr_dst) {
+entry:
+  %dst = inttoptr i32 %iptr_dst to i8*
+  call void @llvm.memset.p0i8.i32(i8* %dst, i8 10, i32 2, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memset_const_val_len_very_small
+; CHECK: mov WORD PTR [{{.*}}],0xa0a
+; CHECK-NOT: mov
+; ARM32-LABEL: test_memset_const_val_len_very_small
+; ARM32: uxtb
+; ARM32: bl {{.*}} memset
+
+define void @test_memset_const_val_len_3(i32 %iptr_dst) {
+entry:
+  %dst = inttoptr i32 %iptr_dst to i8*
+  call void @llvm.memset.p0i8.i32(i8* %dst, i8 16, i32 3, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memset_const_val_len_3
+; CHECK: mov WORD PTR [{{.*}}],0x1010
+; CHECK-NEXT: mov BYTE PTR [{{.*}}+0x2],0x10
+; CHECK-NOT: mov
+; ARM32-LABEL: test_memset_const_val_len_3
+; ARM32: uxtb
+; ARM32: bl {{.*}} memset
+
+define void @test_memset_const_val_len_mid(i32 %iptr_dst) {
+entry:
+  %dst = inttoptr i32 %iptr_dst to i8*
+  call void @llvm.memset.p0i8.i32(i8* %dst, i8 32, i32 9, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memset_const_val_len_mid
+; CHECK: mov DWORD PTR [{{.*}}+0x4],0x20202020
+; CHECK: mov DWORD PTR [{{.*}}],0x20202020
+; CHECK-NEXT: mov BYTE PTR [{{.*}}+0x8],0x20
+; CHECK-NOT: mov
+; ARM32-LABEL: test_memset_const_val_len_mid
+; ARM32: uxtb
+; ARM32: bl {{.*}} memset
+
+define void @test_memset_zero_const_len_small(i32 %iptr_dst) {
+entry:
+  %dst = inttoptr i32 %iptr_dst to i8*
+  call void @llvm.memset.p0i8.i32(i8* %dst, i8 0, i32 12, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memset_zero_const_len_small
+; CHECK: pxor [[ZERO:xmm[0-9]+]],[[ZERO]]
+; CHECK-NEXT: movq QWORD PTR [{{.*}}],[[ZERO]]
+; CHECK-NEXT: mov DWORD PTR [{{.*}}+0x8],0x0
+; CHECK-NOT: mov
+; ARM32-LABEL: test_memset_zero_const_len_small
+; ARM32: uxtb
+; ARM32: bl {{.*}} memset
+
+define void @test_memset_zero_const_len_small_overlap(i32 %iptr_dst) {
+entry:
+  %dst = inttoptr i32 %iptr_dst to i8*
+  call void @llvm.memset.p0i8.i32(i8* %dst, i8 0, i32 15, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memset_zero_const_len_small_overlap
+; CHECK: pxor [[ZERO:xmm[0-9]+]],[[ZERO]]
+; CHECK-NEXT: movq QWORD PTR [{{.*}}],[[ZERO]]
+; CHECK-NEXT: movq QWORD PTR [{{.*}}+0x7],[[ZERO]]
+; CHECK-NOT: mov
+; ARM32-LABEL: test_memset_zero_const_len_small_overlap
+; ARM32: uxtb
+; ARM32: bl {{.*}} memset
+
+define void @test_memset_zero_const_len_large_overlap(i32 %iptr_dst) {
+entry:
+  %dst = inttoptr i32 %iptr_dst to i8*
+  call void @llvm.memset.p0i8.i32(i8* %dst, i8 0, i32 30, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memset_zero_const_len_large_overlap
+; CHECK: pxor [[ZERO:xmm[0-9]+]],[[ZERO]]
+; CHECK-NEXT: movups XMMWORD PTR [{{.*}}],[[ZERO]]
+; CHECK-NEXT: movups XMMWORD PTR [{{.*}}+0xe],[[ZERO]]
+; CHECK-NOT: mov
+; ARM32-LABEL: test_memset_zero_const_len_large_overlap
+; ARM32: uxtb
+; ARM32: bl {{.*}} memset
+
+define void @test_memset_zero_const_len_large(i32 %iptr_dst) {
+entry:
+  %dst = inttoptr i32 %iptr_dst to i8*
+  call void @llvm.memset.p0i8.i32(i8* %dst, i8 0, i32 33, i32 1, i1 false)
+  ret void
+}
+; CHECK-LABEL: test_memset_zero_const_len_large
+; CHECK: pxor [[ZERO:xmm[0-9]+]],[[ZERO]]
+; CHECK-NEXT: movups XMMWORD PTR [{{.*}}+0x10],[[ZERO]]
+; CHECK-NEXT: movups XMMWORD PTR [{{.*}}],[[ZERO]]
+; CHECK-NEXT: mov BYTE PTR [{{.*}}+0x20],0x0
+; CHECK-NOT: mov
+; ARM32-LABEL: test_memset_zero_const_len_large
+; ARM32: uxtb
+; ARM32: bl {{.*}} memset