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https://github.com/RPCS3/llvm-mirror.git
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b585b1e48e
Lengths up to a certain threshold (currently 6 * 256) use a series of MVCs. Lengths above that threshold use a loop to handle X*256 bytes followed by a single MVC to handle the excess (if any). This loop will also be needed in future when support for variable lengths is added. Because the same tablegen classes are used to define MVC and CLC, the patch also has the side-effect of defining a pseudo loop instruction for CLC. That instruction isn't used yet (and wouldn't be handled correctly if it were). I'm planning to use it soon though. llvm-svn: 189331
161 lines
4.2 KiB
LLVM
161 lines
4.2 KiB
LLVM
; Test memset in cases where the set value is variable.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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declare void @llvm.memset.p0i8.i32(i8 *nocapture, i8, i32, i32, i1) nounwind
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declare void @llvm.memset.p0i8.i64(i8 *nocapture, i8, i64, i32, i1) nounwind
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; No bytes, i32 version.
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define void @f1(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f1:
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; CHECK-NOT: %r2
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; CHECK-NOT: %r3
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i32(i8 *%dest, i8 %val, i32 0, i32 1, i1 false)
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ret void
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}
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; No bytes, i64 version.
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define void @f2(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f2:
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; CHECK-NOT: %r2
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; CHECK-NOT: %r3
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i64(i8 *%dest, i8 %val, i64 0, i32 1, i1 false)
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ret void
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}
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; 1 byte, i32 version.
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define void @f3(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f3:
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; CHECK: stc %r3, 0(%r2)
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i32(i8 *%dest, i8 %val, i32 1, i32 1, i1 false)
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ret void
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}
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; 1 byte, i64 version.
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define void @f4(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f4:
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; CHECK: stc %r3, 0(%r2)
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i64(i8 *%dest, i8 %val, i64 1, i32 1, i1 false)
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ret void
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}
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; 2 bytes, i32 version.
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define void @f5(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f5:
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; CHECK-DAG: stc %r3, 0(%r2)
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; CHECK-DAG: stc %r3, 1(%r2)
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i32(i8 *%dest, i8 %val, i32 2, i32 1, i1 false)
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ret void
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}
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; 2 bytes, i64 version.
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define void @f6(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f6:
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; CHECK-DAG: stc %r3, 0(%r2)
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; CHECK-DAG: stc %r3, 1(%r2)
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i64(i8 *%dest, i8 %val, i64 2, i32 1, i1 false)
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ret void
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}
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; 3 bytes, i32 version.
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define void @f7(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f7:
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; CHECK: stc %r3, 0(%r2)
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; CHECK: mvc 1(2,%r2), 0(%r2)
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i32(i8 *%dest, i8 %val, i32 3, i32 1, i1 false)
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ret void
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}
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; 3 bytes, i64 version.
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define void @f8(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f8:
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; CHECK: stc %r3, 0(%r2)
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; CHECK: mvc 1(2,%r2), 0(%r2)
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i64(i8 *%dest, i8 %val, i64 3, i32 1, i1 false)
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ret void
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}
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; 257 bytes, i32 version.
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define void @f9(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f9:
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; CHECK: stc %r3, 0(%r2)
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; CHECK: mvc 1(256,%r2), 0(%r2)
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i32(i8 *%dest, i8 %val, i32 257, i32 1, i1 false)
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ret void
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}
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; 257 bytes, i64 version.
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define void @f10(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f10:
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; CHECK: stc %r3, 0(%r2)
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; CHECK: mvc 1(256,%r2), 0(%r2)
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i64(i8 *%dest, i8 %val, i64 257, i32 1, i1 false)
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ret void
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}
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; 258 bytes, i32 version. We need two MVCs.
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define void @f11(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f11:
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; CHECK: stc %r3, 0(%r2)
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; CHECK: mvc 1(256,%r2), 0(%r2)
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; CHECK: mvc 257(1,%r2), 256(%r2)
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i32(i8 *%dest, i8 %val, i32 258, i32 1, i1 false)
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ret void
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}
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; 258 bytes, i64 version.
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define void @f12(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f12:
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; CHECK: stc %r3, 0(%r2)
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; CHECK: mvc 1(256,%r2), 0(%r2)
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; CHECK: mvc 257(1,%r2), 256(%r2)
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i64(i8 *%dest, i8 %val, i64 258, i32 1, i1 false)
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ret void
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}
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; Test the largest case for which straight-line code is used.
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define void @f13(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f13:
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; CHECK: stc %r3, 0(%r2)
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; CHECK: mvc 1(256,%r2), 0(%r2)
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; CHECK: mvc 257(256,%r2), 256(%r2)
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; CHECK: mvc 513(256,%r2), 512(%r2)
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; CHECK: mvc 769(256,%r2), 768(%r2)
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; CHECK: mvc 1025(256,%r2), 1024(%r2)
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; CHECK: mvc 1281(256,%r2), 1280(%r2)
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i64(i8 *%dest, i8 %val, i64 1537, i32 1,
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i1 false)
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ret void
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}
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; Test the next size up, which uses a loop. We leave the other corner
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; cases to memcpy-01.ll.
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define void @f14(i8 *%dest, i8 %val) {
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; CHECK-LABEL: f14:
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; CHECK: stc %r3, 0(%r2)
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; CHECK: lghi [[COUNT:%r[0-5]]], 6
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; CHECK: [[LABEL:\.L[^:]*]]:
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; CHECK: pfd 2, 769(%r2)
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; CHECK: mvc 1(256,%r2), 0(%r2)
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; CHECK: la %r2, 256(%r2)
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; CHECK: brctg [[COUNT]], [[LABEL]]
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; CHECK: mvc 1(1,%r2), 0(%r2)
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; CHECK: br %r14
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call void @llvm.memset.p0i8.i64(i8 *%dest, i8 %val, i64 1538, i32 1,
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i1 false)
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ret void
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}
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