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|
; Test memcmp using CLC, with i64 results.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
declare i64 @memcmp(i8 *%src1, i8 *%src2, i64 %size)
; Zero-length comparisons should be optimized away.
define i64 @f1(i8 *%src1, i8 *%src2) {
; CHECK-LABEL: f1:
; CHECK: lghi %r2, 0
; CHECK: br %r14
%res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 0)
ret i64 %res
}
; Check a case where the result is used as an integer.
define i64 @f2(i8 *%src1, i8 *%src2) {
; CHECK-LABEL: f2:
; CHECK: clc 0(2,%r2), 0(%r3)
; CHECK: ipm [[REG:%r[0-5]]]
; CHECK: srl [[REG]], 28
; CHECK: rll [[REG]], [[REG]], 31
; CHECK: lgfr %r2, [[REG]]
; CHECK: br %r14
%res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 2)
ret i64 %res
}
; Check a case where the result is tested for equality.
define void @f3(i8 *%src1, i8 *%src2, i64 *%dest) {
; CHECK-LABEL: f3:
; CHECK: clc 0(3,%r2), 0(%r3)
; CHECK-NEXT: je {{\..*}}
; CHECK: br %r14
%res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 3)
%cmp = icmp eq i64 %res, 0
br i1 %cmp, label %exit, label %store
store:
store i64 0, i64 *%dest
br label %exit
exit:
ret void
}
; Check a case where the result is tested for inequality.
define void @f4(i8 *%src1, i8 *%src2, i64 *%dest) {
; CHECK-LABEL: f4:
; CHECK: clc 0(4,%r2), 0(%r3)
; CHECK-NEXT: jlh {{\..*}}
; CHECK: br %r14
entry:
%res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 4)
%cmp = icmp ne i64 %res, 0
br i1 %cmp, label %exit, label %store
store:
store i64 0, i64 *%dest
br label %exit
exit:
ret void
}
; Check a case where the result is tested via slt.
define void @f5(i8 *%src1, i8 *%src2, i64 *%dest) {
; CHECK-LABEL: f5:
; CHECK: clc 0(5,%r2), 0(%r3)
; CHECK-NEXT: jl {{\..*}}
; CHECK: br %r14
entry:
%res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 5)
%cmp = icmp slt i64 %res, 0
br i1 %cmp, label %exit, label %store
store:
store i64 0, i64 *%dest
br label %exit
exit:
ret void
}
; Check a case where the result is tested for sgt.
define void @f6(i8 *%src1, i8 *%src2, i64 *%dest) {
; CHECK-LABEL: f6:
; CHECK: clc 0(6,%r2), 0(%r3)
; CHECK-NEXT: jh {{\..*}}
; CHECK: br %r14
entry:
%res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 6)
%cmp = icmp sgt i64 %res, 0
br i1 %cmp, label %exit, label %store
store:
store i64 0, i64 *%dest
br label %exit
exit:
ret void
}
; Check the upper end of the CLC range. Here the result is used both as
; an integer and for branching.
define i64 @f7(i8 *%src1, i8 *%src2, i64 *%dest) {
; CHECK-LABEL: f7:
; CHECK: clc 0(256,%r2), 0(%r3)
; CHECK: ipm [[REG:%r[0-5]]]
; CHECK: srl [[REG]], 28
; CHECK: rll [[REG]], [[REG]], 31
; CHECK: lgfr %r2, [[REG]]
; CHECK: jl {{.L*}}
; CHECK: br %r14
entry:
%res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 256)
%cmp = icmp slt i64 %res, 0
br i1 %cmp, label %exit, label %store
store:
store i64 0, i64 *%dest
br label %exit
exit:
ret i64 %res
}
; 257 bytes needs two CLCs.
define i64 @f8(i8 *%src1, i8 *%src2) {
; CHECK-LABEL: f8:
; CHECK: clc 0(256,%r2), 0(%r3)
; CHECK: jlh [[LABEL:\..*]]
; CHECK: clc 256(1,%r2), 256(%r3)
; CHECK: [[LABEL]]:
; CHECK: ipm [[REG:%r[0-5]]]
; CHECK: br %r14
%res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 257)
ret i64 %res
}
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