192 lines · plain
1; Test that memcmp won't be converted to CLC if calls are2; marked with nobuiltin, eg. for sanitizers.3;4; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s5 6declare signext i32 @memcmp(ptr %src1, ptr %src2, i64 %size)7 8; Zero-length comparisons should be optimized away.9define i32 @f1(ptr %src1, ptr %src2) {10; CHECK-LABEL: f1:11; CHECK-NOT: clc12; CHECK: brasl %r14, memcmp13; CHECK: br %r1414 %res = call i32 @memcmp(ptr %src1, ptr %src2, i64 0) nobuiltin15 ret i32 %res16}17 18; Check a case where the result is used as an integer.19define i32 @f2(ptr %src1, ptr %src2) {20; CHECK-LABEL: f2:21; CHECK-NOT: clc22; CHECK: brasl %r14, memcmp23; CHECK: br %r1424 %res = call i32 @memcmp(ptr %src1, ptr %src2, i64 2) nobuiltin25 ret i32 %res26}27 28; Check a case where the result is tested for equality.29define void @f3(ptr %src1, ptr %src2, ptr %dest) {30; CHECK-LABEL: f3:31; CHECK-NOT: clc32; CHECK: brasl %r14, memcmp33; CHECK: br %r1434 %res = call i32 @memcmp(ptr %src1, ptr %src2, i64 3) nobuiltin35 %cmp = icmp eq i32 %res, 036 br i1 %cmp, label %exit, label %store37 38store:39 store i32 0, ptr %dest40 br label %exit41 42exit:43 ret void44}45 46; Check a case where the result is tested for inequality.47define void @f4(ptr %src1, ptr %src2, ptr %dest) {48; CHECK-LABEL: f4:49; CHECK-NOT: clc50; CHECK: brasl %r14, memcmp51; CHECK: br %r1452entry:53 %res = call i32 @memcmp(ptr %src1, ptr %src2, i64 4) nobuiltin54 %cmp = icmp ne i32 %res, 055 br i1 %cmp, label %exit, label %store56 57store:58 store i32 0, ptr %dest59 br label %exit60 61exit:62 ret void63}64 65; Check a case where the result is tested via slt.66define void @f5(ptr %src1, ptr %src2, ptr %dest) {67; CHECK-LABEL: f5:68; CHECK-NOT: clc69; CHECK: brasl %r14, memcmp70; CHECK: br %r1471entry:72 %res = call i32 @memcmp(ptr %src1, ptr %src2, i64 5) nobuiltin73 %cmp = icmp slt i32 %res, 074 br i1 %cmp, label %exit, label %store75 76store:77 store i32 0, ptr %dest78 br label %exit79 80exit:81 ret void82}83 84; Check a case where the result is tested for sgt.85define void @f6(ptr %src1, ptr %src2, ptr %dest) {86; CHECK-LABEL: f6:87; CHECK-NOT: clc88; CHECK: brasl %r14, memcmp89; CHECK: br %r1490entry:91 %res = call i32 @memcmp(ptr %src1, ptr %src2, i64 6) nobuiltin92 %cmp = icmp sgt i32 %res, 093 br i1 %cmp, label %exit, label %store94 95store:96 store i32 0, ptr %dest97 br label %exit98 99exit:100 ret void101}102 103; Check the upper end of the CLC range. Here the result is used both as104; an integer and for branching.105define i32 @f7(ptr %src1, ptr %src2, ptr %dest) {106; CHECK-LABEL: f7:107; CHECK-NOT: clc108; CHECK: brasl %r14, memcmp109; CHECK: br %r14110entry:111 %res = call i32 @memcmp(ptr %src1, ptr %src2, i64 256) nobuiltin112 %cmp = icmp slt i32 %res, 0113 br i1 %cmp, label %exit, label %store114 115store:116 store i32 0, ptr %dest117 br label %exit118 119exit:120 ret i32 %res121}122 123; 257 bytes needs two CLCs.124define i32 @f8(ptr %src1, ptr %src2) {125; CHECK-LABEL: f8:126; CHECK-NOT: clc127; CHECK: brasl %r14, memcmp128; CHECK: br %r14129 %res = call i32 @memcmp(ptr %src1, ptr %src2, i64 257) nobuiltin130 ret i32 %res131}132 133; Test a comparison of 258 bytes in which the CC result can be used directly.134define void @f9(ptr %src1, ptr %src2, ptr %dest) {135; CHECK-LABEL: f9:136; CHECK-NOT: clc137; CHECK: brasl %r14, memcmp138; CHECK: br %r14139entry:140 %res = call i32 @memcmp(ptr %src1, ptr %src2, i64 257) nobuiltin141 %cmp = icmp slt i32 %res, 0142 br i1 %cmp, label %exit, label %store143 144store:145 store i32 0, ptr %dest146 br label %exit147 148exit:149 ret void150}151 152; Test the largest size that can use two CLCs.153define i32 @f10(ptr %src1, ptr %src2) {154; CHECK-LABEL: f10:155; CHECK-NOT: clc156; CHECK: brasl %r14, memcmp157; CHECK: br %r14158 %res = call i32 @memcmp(ptr %src1, ptr %src2, i64 512) nobuiltin159 ret i32 %res160}161 162; Test the smallest size that needs 3 CLCs.163define i32 @f11(ptr %src1, ptr %src2) {164; CHECK-LABEL: f11:165; CHECK-NOT: clc166; CHECK: brasl %r14, memcmp167; CHECK: br %r14168 %res = call i32 @memcmp(ptr %src1, ptr %src2, i64 513) nobuiltin169 ret i32 %res170}171 172; Test the largest size than can use 3 CLCs.173define i32 @f12(ptr %src1, ptr %src2) {174; CHECK-LABEL: f12:175; CHECK-NOT: clc176; CHECK: brasl %r14, memcmp177; CHECK: br %r14178 %res = call i32 @memcmp(ptr %src1, ptr %src2, i64 768) nobuiltin179 ret i32 %res180}181 182; The next size up uses a loop instead. We leave the more complicated183; loop tests to memcpy-01.ll, which shares the same form.184define i32 @f13(ptr %src1, ptr %src2) {185; CHECK-LABEL: f13:186; CHECK-NOT: clc187; CHECK: brasl %r14, memcmp188; CHECK: br %r14189 %res = call i32 @memcmp(ptr %src1, ptr %src2, i64 769) nobuiltin190 ret i32 %res191}192