222 lines
5.2 KiB
LLVM
222 lines
5.2 KiB
LLVM
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; Test memcmp using CLC, with i32 results.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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declare signext i32 @memcmp(i8 *%src1, i8 *%src2, i64 %size)
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; Zero-length comparisons should be optimized away.
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define i32 @f1(i8 *%src1, i8 *%src2) {
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; CHECK-LABEL: f1:
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; CHECK: lhi %r2, 0
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; CHECK: br %r14
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%res = call i32 @memcmp(i8 *%src1, i8 *%src2, i64 0)
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ret i32 %res
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}
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; Check a case where the result is used as an integer.
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define i32 @f2(i8 *%src1, i8 *%src2) {
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; CHECK-LABEL: f2:
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; CHECK: clc 0(2,%r3), 0(%r2)
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; CHECK: ipm %r2
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; CHECK: sll %r2, 2
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; CHECK: sra %r2, 30
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; CHECK: br %r14
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%res = call i32 @memcmp(i8 *%src1, i8 *%src2, i64 2)
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ret i32 %res
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}
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; Check a case where the result is tested for equality.
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define void @f3(i8 *%src1, i8 *%src2, i32 *%dest) {
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; CHECK-LABEL: f3:
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; CHECK: clc 0(3,%r3), 0(%r2)
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; CHECK-NEXT: ber %r14
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; CHECK: br %r14
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%res = call i32 @memcmp(i8 *%src1, i8 *%src2, i64 3)
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%cmp = icmp eq i32 %res, 0
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br i1 %cmp, label %exit, label %store
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store:
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store i32 0, i32 *%dest
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br label %exit
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exit:
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ret void
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}
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; Check a case where the result is tested for inequality.
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define void @f4(i8 *%src1, i8 *%src2, i32 *%dest) {
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; CHECK-LABEL: f4:
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; CHECK: clc 0(4,%r3), 0(%r2)
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; CHECK-NEXT: blhr %r14
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; CHECK: br %r14
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entry:
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%res = call i32 @memcmp(i8 *%src1, i8 *%src2, i64 4)
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%cmp = icmp ne i32 %res, 0
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br i1 %cmp, label %exit, label %store
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store:
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store i32 0, i32 *%dest
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br label %exit
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exit:
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ret void
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}
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; Check a case where the result is tested via slt.
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define void @f5(i8 *%src1, i8 *%src2, i32 *%dest) {
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; CHECK-LABEL: f5:
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; CHECK: clc 0(5,%r3), 0(%r2)
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; CHECK-NEXT: bhr %r14
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; CHECK: br %r14
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entry:
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%res = call i32 @memcmp(i8 *%src1, i8 *%src2, i64 5)
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%cmp = icmp slt i32 %res, 0
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br i1 %cmp, label %exit, label %store
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store:
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store i32 0, i32 *%dest
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br label %exit
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exit:
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ret void
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}
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; Check a case where the result is tested for sgt.
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define void @f6(i8 *%src1, i8 *%src2, i32 *%dest) {
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; CHECK-LABEL: f6:
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; CHECK: clc 0(6,%r3), 0(%r2)
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; CHECK-NEXT: blr %r14
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; CHECK: br %r14
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entry:
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%res = call i32 @memcmp(i8 *%src1, i8 *%src2, i64 6)
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%cmp = icmp sgt i32 %res, 0
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br i1 %cmp, label %exit, label %store
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store:
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store i32 0, i32 *%dest
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br label %exit
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exit:
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ret void
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}
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; Check the upper end of the CLC range. Here the result is used both as
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; an integer and for branching.
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define i32 @f7(i8 *%src1, i8 *%src2, i32 *%dest) {
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; CHECK-LABEL: f7:
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; CHECK: clc 0(256,%r3), 0(%r2)
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; CHECK: ipm %r2
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; CHECK: sll %r2, 2
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; CHECK: sra %r2, 30
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; CHECK: blr %r14
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; CHECK: br %r14
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entry:
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%res = call i32 @memcmp(i8 *%src1, i8 *%src2, i64 256)
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%cmp = icmp slt i32 %res, 0
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br i1 %cmp, label %exit, label %store
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store:
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store i32 0, i32 *%dest
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br label %exit
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exit:
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ret i32 %res
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}
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; 257 bytes needs two CLCs.
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define i32 @f8(i8 *%src1, i8 *%src2) {
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; CHECK-LABEL: f8:
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; CHECK: clc 0(256,%r3), 0(%r2)
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; CHECK: jlh [[LABEL:\..*]]
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; CHECK: clc 256(1,%r3), 256(%r2)
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; CHECK: [[LABEL]]:
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; CHECK: ipm [[REG:%r[0-5]]]
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; CHECK: br %r14
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%res = call i32 @memcmp(i8 *%src1, i8 *%src2, i64 257)
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ret i32 %res
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}
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; Test a comparison of 258 bytes in which the CC result can be used directly.
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define void @f9(i8 *%src1, i8 *%src2, i32 *%dest) {
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; CHECK-LABEL: f9:
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; CHECK: clc 0(256,%r3), 0(%r2)
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; CHECK: jlh [[LABEL:\..*]]
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; CHECK: clc 256(1,%r3), 256(%r2)
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; CHECK: [[LABEL]]:
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; CHECK-NEXT: bhr %r14
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; CHECK: br %r14
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entry:
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%res = call i32 @memcmp(i8 *%src1, i8 *%src2, i64 257)
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%cmp = icmp slt i32 %res, 0
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br i1 %cmp, label %exit, label %store
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store:
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store i32 0, i32 *%dest
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br label %exit
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exit:
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ret void
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}
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; Test the largest size that can use two CLCs.
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define i32 @f10(i8 *%src1, i8 *%src2) {
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; CHECK-LABEL: f10:
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; CHECK: clc 0(256,%r3), 0(%r2)
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; CHECK: jlh [[LABEL:\..*]]
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; CHECK: clc 256(256,%r3), 256(%r2)
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; CHECK: [[LABEL]]:
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; CHECK: ipm [[REG:%r[0-5]]]
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; CHECK: br %r14
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%res = call i32 @memcmp(i8 *%src1, i8 *%src2, i64 512)
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ret i32 %res
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}
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; Test the smallest size that needs 3 CLCs.
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define i32 @f11(i8 *%src1, i8 *%src2) {
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; CHECK-LABEL: f11:
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; CHECK: clc 0(256,%r3), 0(%r2)
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; CHECK: jlh [[LABEL:\..*]]
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; CHECK: clc 256(256,%r3), 256(%r2)
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; CHECK: jlh [[LABEL]]
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; CHECK: clc 512(1,%r3), 512(%r2)
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; CHECK: [[LABEL]]:
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; CHECK: ipm [[REG:%r[0-5]]]
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; CHECK: br %r14
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%res = call i32 @memcmp(i8 *%src1, i8 *%src2, i64 513)
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ret i32 %res
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}
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; Test the largest size than can use 3 CLCs.
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define i32 @f12(i8 *%src1, i8 *%src2) {
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; CHECK-LABEL: f12:
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; CHECK: clc 0(256,%r3), 0(%r2)
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; CHECK: jlh [[LABEL:\..*]]
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; CHECK: clc 256(256,%r3), 256(%r2)
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; CHECK: jlh [[LABEL]]
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; CHECK: clc 512(256,%r3), 512(%r2)
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; CHECK: [[LABEL]]:
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; CHECK: ipm [[REG:%r[0-5]]]
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; CHECK: br %r14
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%res = call i32 @memcmp(i8 *%src1, i8 *%src2, i64 768)
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ret i32 %res
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}
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; The next size up uses a loop instead. We leave the more complicated
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; loop tests to memcpy-01.ll, which shares the same form.
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define i32 @f13(i8 *%src1, i8 *%src2) {
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; CHECK-LABEL: f13:
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; CHECK: lghi [[COUNT:%r[0-5]]], 3
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; CHECK: [[LOOP:.L[^:]*]]:
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; CHECK: clc 0(256,%r3), 0(%r2)
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; CHECK: jlh [[LABEL:\..*]]
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; CHECK-DAG: la %r2, 256(%r2)
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; CHECK-DAG: la %r3, 256(%r3)
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; CHECK: brctg [[COUNT]], [[LOOP]]
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; CHECK: clc 0(1,%r3), 0(%r2)
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; CHECK: [[LABEL]]:
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; CHECK: ipm [[REG:%r[0-5]]]
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; CHECK: br %r14
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%res = call i32 @memcmp(i8 *%src1, i8 *%src2, i64 769)
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ret i32 %res
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}
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