| ; 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 |
| } |