1 ; RUN: llc -mtriple=aarch64-none-linux-gnu < %s | FileCheck %s 2 3 ; First, a simple example from Clang. The registers could plausibly be 4 ; different, but probably won't be. 5 6 %struct.foo = type { i8, [2 x i8], i8 } 7 8 define [1 x i64] @from_clang([1 x i64] %f.coerce, i32 %n) nounwind readnone { 9 ; CHECK-LABEL: from_clang: 10 ; CHECK: bfi w0, w1, #3, #4 11 ; CHECK-NEXT: ret 12 13 entry: 14 %f.coerce.fca.0.extract = extractvalue [1 x i64] %f.coerce, 0 15 %tmp.sroa.0.0.extract.trunc = trunc i64 %f.coerce.fca.0.extract to i32 16 %bf.value = shl i32 %n, 3 17 %0 = and i32 %bf.value, 120 18 %f.sroa.0.0.insert.ext.masked = and i32 %tmp.sroa.0.0.extract.trunc, 135 19 %1 = or i32 %f.sroa.0.0.insert.ext.masked, %0 20 %f.sroa.0.0.extract.trunc = zext i32 %1 to i64 21 %tmp1.sroa.1.1.insert.insert = and i64 %f.coerce.fca.0.extract, 4294967040 22 %tmp1.sroa.0.0.insert.insert = or i64 %f.sroa.0.0.extract.trunc, %tmp1.sroa.1.1.insert.insert 23 %.fca.0.insert = insertvalue [1 x i64] undef, i64 %tmp1.sroa.0.0.insert.insert, 0 24 ret [1 x i64] %.fca.0.insert 25 } 26 27 define void @test_whole32(i32* %existing, i32* %new) { 28 ; CHECK-LABEL: test_whole32: 29 ; CHECK: bfi {{w[0-9]+}}, {{w[0-9]+}}, #26, #5 30 31 %oldval = load volatile i32* %existing 32 %oldval_keep = and i32 %oldval, 2214592511 ; =0x83ffffff 33 34 %newval = load volatile i32* %new 35 %newval_shifted = shl i32 %newval, 26 36 %newval_masked = and i32 %newval_shifted, 2080374784 ; = 0x7c000000 37 38 %combined = or i32 %oldval_keep, %newval_masked 39 store volatile i32 %combined, i32* %existing 40 41 ret void 42 } 43 44 define void @test_whole64(i64* %existing, i64* %new) { 45 ; CHECK-LABEL: test_whole64: 46 ; CHECK: bfi {{x[0-9]+}}, {{x[0-9]+}}, #26, #14 47 ; CHECK-NOT: and 48 ; CHECK: ret 49 50 %oldval = load volatile i64* %existing 51 %oldval_keep = and i64 %oldval, 18446742974265032703 ; = 0xffffff0003ffffffL 52 53 %newval = load volatile i64* %new 54 %newval_shifted = shl i64 %newval, 26 55 %newval_masked = and i64 %newval_shifted, 1099444518912 ; = 0xfffc000000 56 57 %combined = or i64 %oldval_keep, %newval_masked 58 store volatile i64 %combined, i64* %existing 59 60 ret void 61 } 62 63 define void @test_whole32_from64(i64* %existing, i64* %new) { 64 ; CHECK-LABEL: test_whole32_from64: 65 ; CHECK: bfi {{w[0-9]+}}, {{w[0-9]+}}, #{{0|16}}, #16 66 ; CHECK-NOT: and 67 ; CHECK: ret 68 69 %oldval = load volatile i64* %existing 70 %oldval_keep = and i64 %oldval, 4294901760 ; = 0xffff0000 71 72 %newval = load volatile i64* %new 73 %newval_masked = and i64 %newval, 65535 ; = 0xffff 74 75 %combined = or i64 %oldval_keep, %newval_masked 76 store volatile i64 %combined, i64* %existing 77 78 ret void 79 } 80 81 define void @test_32bit_masked(i32 *%existing, i32 *%new) { 82 ; CHECK-LABEL: test_32bit_masked: 83 ; CHECK: bfi [[INSERT:w[0-9]+]], {{w[0-9]+}}, #3, #4 84 ; CHECK: and {{w[0-9]+}}, [[INSERT]], #0xff 85 86 %oldval = load volatile i32* %existing 87 %oldval_keep = and i32 %oldval, 135 ; = 0x87 88 89 %newval = load volatile i32* %new 90 %newval_shifted = shl i32 %newval, 3 91 %newval_masked = and i32 %newval_shifted, 120 ; = 0x78 92 93 %combined = or i32 %oldval_keep, %newval_masked 94 store volatile i32 %combined, i32* %existing 95 96 ret void 97 } 98 99 define void @test_64bit_masked(i64 *%existing, i64 *%new) { 100 ; CHECK-LABEL: test_64bit_masked: 101 ; CHECK: bfi [[INSERT:x[0-9]+]], {{x[0-9]+}}, #40, #8 102 ; CHECK: and {{x[0-9]+}}, [[INSERT]], #0xffff00000000 103 104 %oldval = load volatile i64* %existing 105 %oldval_keep = and i64 %oldval, 1095216660480 ; = 0xff_0000_0000 106 107 %newval = load volatile i64* %new 108 %newval_shifted = shl i64 %newval, 40 109 %newval_masked = and i64 %newval_shifted, 280375465082880 ; = 0xff00_0000_0000 110 111 %combined = or i64 %newval_masked, %oldval_keep 112 store volatile i64 %combined, i64* %existing 113 114 ret void 115 } 116 117 ; Mask is too complicated for literal ANDwwi, make sure other avenues are tried. 118 define void @test_32bit_complexmask(i32 *%existing, i32 *%new) { 119 ; CHECK-LABEL: test_32bit_complexmask: 120 ; CHECK: bfi {{w[0-9]+}}, {{w[0-9]+}}, #3, #4 121 ; CHECK: and {{w[0-9]+}}, {{w[0-9]+}}, {{w[0-9]+}} 122 123 %oldval = load volatile i32* %existing 124 %oldval_keep = and i32 %oldval, 647 ; = 0x287 125 126 %newval = load volatile i32* %new 127 %newval_shifted = shl i32 %newval, 3 128 %newval_masked = and i32 %newval_shifted, 120 ; = 0x278 129 130 %combined = or i32 %oldval_keep, %newval_masked 131 store volatile i32 %combined, i32* %existing 132 133 ret void 134 } 135 136 ; Neither mask is is a contiguous set of 1s. BFI can't be used 137 define void @test_32bit_badmask(i32 *%existing, i32 *%new) { 138 ; CHECK-LABEL: test_32bit_badmask: 139 ; CHECK-NOT: bfi 140 ; CHECK: ret 141 142 %oldval = load volatile i32* %existing 143 %oldval_keep = and i32 %oldval, 135 ; = 0x87 144 145 %newval = load volatile i32* %new 146 %newval_shifted = shl i32 %newval, 3 147 %newval_masked = and i32 %newval_shifted, 632 ; = 0x278 148 149 %combined = or i32 %oldval_keep, %newval_masked 150 store volatile i32 %combined, i32* %existing 151 152 ret void 153 } 154 155 ; Ditto 156 define void @test_64bit_badmask(i64 *%existing, i64 *%new) { 157 ; CHECK-LABEL: test_64bit_badmask: 158 ; CHECK-NOT: bfi 159 ; CHECK: ret 160 161 %oldval = load volatile i64* %existing 162 %oldval_keep = and i64 %oldval, 135 ; = 0x87 163 164 %newval = load volatile i64* %new 165 %newval_shifted = shl i64 %newval, 3 166 %newval_masked = and i64 %newval_shifted, 664 ; = 0x278 167 168 %combined = or i64 %oldval_keep, %newval_masked 169 store volatile i64 %combined, i64* %existing 170 171 ret void 172 } 173 174 ; Bitfield insert where there's a left-over shr needed at the beginning 175 ; (e.g. result of str.bf1 = str.bf2) 176 define void @test_32bit_with_shr(i32* %existing, i32* %new) { 177 ; CHECK-LABEL: test_32bit_with_shr: 178 179 %oldval = load volatile i32* %existing 180 %oldval_keep = and i32 %oldval, 2214592511 ; =0x83ffffff 181 182 %newval = load i32* %new 183 %newval_shifted = shl i32 %newval, 12 184 %newval_masked = and i32 %newval_shifted, 2080374784 ; = 0x7c000000 185 186 %combined = or i32 %oldval_keep, %newval_masked 187 store volatile i32 %combined, i32* %existing 188 ; CHECK: lsr [[BIT:w[0-9]+]], {{w[0-9]+}}, #14 189 ; CHECK: bfi {{w[0-9]}}, [[BIT]], #26, #5 190 191 ret void 192 } 193 194
