1; RUN: llc < %s -march=aarch64 | FileCheck %s 2 3; Convert mul x, pow2 to shift. 4; Convert mul x, pow2 +/- 1 to shift + add/sub. 5 6define i32 @test2(i32 %x) { 7; CHECK-LABEL: test2 8; CHECK: lsl w0, w0, #1 9 10 %mul = shl nsw i32 %x, 1 11 ret i32 %mul 12} 13 14define i32 @test3(i32 %x) { 15; CHECK-LABEL: test3 16; CHECK: add w0, w0, w0, lsl #1 17 18 %mul = mul nsw i32 %x, 3 19 ret i32 %mul 20} 21 22define i32 @test4(i32 %x) { 23; CHECK-LABEL: test4 24; CHECK: lsl w0, w0, #2 25 26 %mul = shl nsw i32 %x, 2 27 ret i32 %mul 28} 29 30define i32 @test5(i32 %x) { 31; CHECK-LABEL: test5 32; CHECK: add w0, w0, w0, lsl #2 33 34 35 %mul = mul nsw i32 %x, 5 36 ret i32 %mul 37} 38 39define i32 @test7(i32 %x) { 40; CHECK-LABEL: test7 41; CHECK: lsl {{w[0-9]+}}, w0, #3 42; CHECK: sub w0, {{w[0-9]+}}, w0 43 44 %mul = mul nsw i32 %x, 7 45 ret i32 %mul 46} 47 48define i32 @test8(i32 %x) { 49; CHECK-LABEL: test8 50; CHECK: lsl w0, w0, #3 51 52 %mul = shl nsw i32 %x, 3 53 ret i32 %mul 54} 55 56define i32 @test9(i32 %x) { 57; CHECK-LABEL: test9 58; CHECK: add w0, w0, w0, lsl #3 59 60 %mul = mul nsw i32 %x, 9 61 ret i32 %mul 62} 63 64; Convert mul x, -pow2 to shift. 65; Convert mul x, -(pow2 +/- 1) to shift + add/sub. 66 67define i32 @ntest2(i32 %x) { 68; CHECK-LABEL: ntest2 69; CHECK: neg w0, w0, lsl #1 70 71 %mul = mul nsw i32 %x, -2 72 ret i32 %mul 73} 74 75define i32 @ntest3(i32 %x) { 76; CHECK-LABEL: ntest3 77; CHECK: sub w0, w0, w0, lsl #2 78 79 %mul = mul nsw i32 %x, -3 80 ret i32 %mul 81} 82 83define i32 @ntest4(i32 %x) { 84; CHECK-LABEL: ntest4 85; CHECK:neg w0, w0, lsl #2 86 87 %mul = mul nsw i32 %x, -4 88 ret i32 %mul 89} 90 91define i32 @ntest5(i32 %x) { 92; CHECK-LABEL: ntest5 93; CHECK: add {{w[0-9]+}}, w0, w0, lsl #2 94; CHECK: neg w0, {{w[0-9]+}} 95 %mul = mul nsw i32 %x, -5 96 ret i32 %mul 97} 98 99define i32 @ntest7(i32 %x) { 100; CHECK-LABEL: ntest7 101; CHECK: sub w0, w0, w0, lsl #3 102 103 %mul = mul nsw i32 %x, -7 104 ret i32 %mul 105} 106 107define i32 @ntest8(i32 %x) { 108; CHECK-LABEL: ntest8 109; CHECK: neg w0, w0, lsl #3 110 111 %mul = mul nsw i32 %x, -8 112 ret i32 %mul 113} 114 115define i32 @ntest9(i32 %x) { 116; CHECK-LABEL: ntest9 117; CHECK: add {{w[0-9]+}}, w0, w0, lsl #3 118; CHECK: neg w0, {{w[0-9]+}} 119 120 %mul = mul nsw i32 %x, -9 121 ret i32 %mul 122} 123