1 ; Test memcmp using CLC, with i64 results. 2 ; 3 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s 4 5 declare i64 @memcmp(i8 *%src1, i8 *%src2, i64 %size) 6 7 ; Zero-length comparisons should be optimized away. 8 define i64 @f1(i8 *%src1, i8 *%src2) { 9 ; CHECK-LABEL: f1: 10 ; CHECK: lghi %r2, 0 11 ; CHECK: br %r14 12 %res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 0) 13 ret i64 %res 14 } 15 16 ; Check a case where the result is used as an integer. 17 define i64 @f2(i8 *%src1, i8 *%src2) { 18 ; CHECK-LABEL: f2: 19 ; CHECK: clc 0(2,%r2), 0(%r3) 20 ; CHECK: ipm [[REG:%r[0-5]]] 21 ; CHECK: srl [[REG]], 28 22 ; CHECK: rll [[REG]], [[REG]], 31 23 ; CHECK: lgfr %r2, [[REG]] 24 ; CHECK: br %r14 25 %res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 2) 26 ret i64 %res 27 } 28 29 ; Check a case where the result is tested for equality. 30 define void @f3(i8 *%src1, i8 *%src2, i64 *%dest) { 31 ; CHECK-LABEL: f3: 32 ; CHECK: clc 0(3,%r2), 0(%r3) 33 ; CHECK-NEXT: je {{\..*}} 34 ; CHECK: br %r14 35 %res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 3) 36 %cmp = icmp eq i64 %res, 0 37 br i1 %cmp, label %exit, label %store 38 39 store: 40 store i64 0, i64 *%dest 41 br label %exit 42 43 exit: 44 ret void 45 } 46 47 ; Check a case where the result is tested for inequality. 48 define void @f4(i8 *%src1, i8 *%src2, i64 *%dest) { 49 ; CHECK-LABEL: f4: 50 ; CHECK: clc 0(4,%r2), 0(%r3) 51 ; CHECK-NEXT: jlh {{\..*}} 52 ; CHECK: br %r14 53 entry: 54 %res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 4) 55 %cmp = icmp ne i64 %res, 0 56 br i1 %cmp, label %exit, label %store 57 58 store: 59 store i64 0, i64 *%dest 60 br label %exit 61 62 exit: 63 ret void 64 } 65 66 ; Check a case where the result is tested via slt. 67 define void @f5(i8 *%src1, i8 *%src2, i64 *%dest) { 68 ; CHECK-LABEL: f5: 69 ; CHECK: clc 0(5,%r2), 0(%r3) 70 ; CHECK-NEXT: jl {{\..*}} 71 ; CHECK: br %r14 72 entry: 73 %res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 5) 74 %cmp = icmp slt i64 %res, 0 75 br i1 %cmp, label %exit, label %store 76 77 store: 78 store i64 0, i64 *%dest 79 br label %exit 80 81 exit: 82 ret void 83 } 84 85 ; Check a case where the result is tested for sgt. 86 define void @f6(i8 *%src1, i8 *%src2, i64 *%dest) { 87 ; CHECK-LABEL: f6: 88 ; CHECK: clc 0(6,%r2), 0(%r3) 89 ; CHECK-NEXT: jh {{\..*}} 90 ; CHECK: br %r14 91 entry: 92 %res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 6) 93 %cmp = icmp sgt i64 %res, 0 94 br i1 %cmp, label %exit, label %store 95 96 store: 97 store i64 0, i64 *%dest 98 br label %exit 99 100 exit: 101 ret void 102 } 103 104 ; Check the upper end of the CLC range. Here the result is used both as 105 ; an integer and for branching. 106 define i64 @f7(i8 *%src1, i8 *%src2, i64 *%dest) { 107 ; CHECK-LABEL: f7: 108 ; CHECK: clc 0(256,%r2), 0(%r3) 109 ; CHECK: ipm [[REG:%r[0-5]]] 110 ; CHECK: srl [[REG]], 28 111 ; CHECK: rll [[REG]], [[REG]], 31 112 ; CHECK: lgfr %r2, [[REG]] 113 ; CHECK: jl {{.L*}} 114 ; CHECK: br %r14 115 entry: 116 %res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 256) 117 %cmp = icmp slt i64 %res, 0 118 br i1 %cmp, label %exit, label %store 119 120 store: 121 store i64 0, i64 *%dest 122 br label %exit 123 124 exit: 125 ret i64 %res 126 } 127 128 ; 257 bytes needs two CLCs. 129 define i64 @f8(i8 *%src1, i8 *%src2) { 130 ; CHECK-LABEL: f8: 131 ; CHECK: clc 0(256,%r2), 0(%r3) 132 ; CHECK: jlh [[LABEL:\..*]] 133 ; CHECK: clc 256(1,%r2), 256(%r3) 134 ; CHECK: [[LABEL]]: 135 ; CHECK: ipm [[REG:%r[0-5]]] 136 ; CHECK: br %r14 137 %res = call i64 @memcmp(i8 *%src1, i8 *%src2, i64 257) 138 ret i64 %res 139 } 140
