1 ; Test 16-bit byteswaps from memory to registers. 2 ; 3 ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s 4 5 declare i16 @llvm.bswap.i16(i16 %a) 6 7 ; Check LRVH with no displacement. 8 define i16 @f1(i16 *%src) { 9 ; CHECK-LABEL: f1: 10 ; CHECK: lrvh %r2, 0(%r2) 11 ; CHECK: br %r14 12 %a = load i16 , i16 *%src 13 %swapped = call i16 @llvm.bswap.i16(i16 %a) 14 ret i16 %swapped 15 } 16 17 ; Check the high end of the aligned LRVH range. 18 define i16 @f2(i16 *%src) { 19 ; CHECK-LABEL: f2: 20 ; CHECK: lrvh %r2, 524286(%r2) 21 ; CHECK: br %r14 22 %ptr = getelementptr i16, i16 *%src, i64 262143 23 %a = load i16 , i16 *%ptr 24 %swapped = call i16 @llvm.bswap.i16(i16 %a) 25 ret i16 %swapped 26 } 27 28 ; Check the next word up, which needs separate address logic. 29 ; Other sequences besides this one would be OK. 30 define i16 @f3(i16 *%src) { 31 ; CHECK-LABEL: f3: 32 ; CHECK: agfi %r2, 524288 33 ; CHECK: lrvh %r2, 0(%r2) 34 ; CHECK: br %r14 35 %ptr = getelementptr i16, i16 *%src, i64 262144 36 %a = load i16 , i16 *%ptr 37 %swapped = call i16 @llvm.bswap.i16(i16 %a) 38 ret i16 %swapped 39 } 40 41 ; Check the high end of the negative aligned LRVH range. 42 define i16 @f4(i16 *%src) { 43 ; CHECK-LABEL: f4: 44 ; CHECK: lrvh %r2, -2(%r2) 45 ; CHECK: br %r14 46 %ptr = getelementptr i16, i16 *%src, i64 -1 47 %a = load i16 , i16 *%ptr 48 %swapped = call i16 @llvm.bswap.i16(i16 %a) 49 ret i16 %swapped 50 } 51 52 ; Check the low end of the LRVH range. 53 define i16 @f5(i16 *%src) { 54 ; CHECK-LABEL: f5: 55 ; CHECK: lrvh %r2, -524288(%r2) 56 ; CHECK: br %r14 57 %ptr = getelementptr i16, i16 *%src, i64 -262144 58 %a = load i16 , i16 *%ptr 59 %swapped = call i16 @llvm.bswap.i16(i16 %a) 60 ret i16 %swapped 61 } 62 63 ; Check the next word down, which needs separate address logic. 64 ; Other sequences besides this one would be OK. 65 define i16 @f6(i16 *%src) { 66 ; CHECK-LABEL: f6: 67 ; CHECK: agfi %r2, -524290 68 ; CHECK: lrvh %r2, 0(%r2) 69 ; CHECK: br %r14 70 %ptr = getelementptr i16, i16 *%src, i64 -262145 71 %a = load i16 , i16 *%ptr 72 %swapped = call i16 @llvm.bswap.i16(i16 %a) 73 ret i16 %swapped 74 } 75 76 ; Check that LRVH allows an index. 77 define i16 @f7(i64 %src, i64 %index) { 78 ; CHECK-LABEL: f7: 79 ; CHECK: lrvh %r2, 524287({{%r3,%r2|%r2,%r3}}) 80 ; CHECK: br %r14 81 %add1 = add i64 %src, %index 82 %add2 = add i64 %add1, 524287 83 %ptr = inttoptr i64 %add2 to i16 * 84 %a = load i16 , i16 *%ptr 85 %swapped = call i16 @llvm.bswap.i16(i16 %a) 86 ret i16 %swapped 87 } 88 89 ; Check that volatile accesses do not use LRVH, which might access the 90 ; storage multple times. 91 define i16 @f8(i16 *%src) { 92 ; CHECK-LABEL: f8: 93 ; CHECK: lh [[REG:%r[0-5]]], 0(%r2) 94 ; CHECK: lrvr %r2, [[REG]] 95 ; CHECK: br %r14 96 %a = load volatile i16 , i16 *%src 97 %swapped = call i16 @llvm.bswap.i16(i16 %a) 98 ret i16 %swapped 99 } 100
