1; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2; RUN: llc -mtriple=x86_64-unknown-unknown -show-mc-encoding < %s | FileCheck %s 3 4; Test that the direct object emission selects the 'and' variant with 8-bit 5; immediate. 6; We used to get this wrong when using direct object emission, but not when 7; reading assembly. 8 9define void @f1() nounwind { 10; CHECK-LABEL: f1: 11; CHECK: # %bb.0: 12; CHECK-NEXT: pushq %rbp # encoding: [0x55] 13; CHECK-NEXT: movq %rsp, %rbp # encoding: [0x48,0x89,0xe5] 14; CHECK-NEXT: andq $-32, %rsp # encoding: [0x48,0x83,0xe4,0xe0] 15; CHECK-NEXT: movq %rbp, %rsp # encoding: [0x48,0x89,0xec] 16; CHECK-NEXT: popq %rbp # encoding: [0x5d] 17; CHECK-NEXT: retq # encoding: [0xc3] 18 %foo = alloca i8, align 32 19 ret void 20} 21 22define void @f2(i16 %x, i1 *%y) nounwind { 23; CHECK-LABEL: f2: 24; CHECK: # %bb.0: 25; CHECK-NEXT: andl $1, %edi # encoding: [0x83,0xe7,0x01] 26; CHECK-NEXT: movb %dil, (%rsi) # encoding: [0x40,0x88,0x3e] 27; CHECK-NEXT: retq # encoding: [0xc3] 28 %c = trunc i16 %x to i1 29 store i1 %c, i1* %y 30 ret void 31} 32 33define void @f3(i32 %x, i1 *%y) nounwind { 34; CHECK-LABEL: f3: 35; CHECK: # %bb.0: 36; CHECK-NEXT: andl $1, %edi # encoding: [0x83,0xe7,0x01] 37; CHECK-NEXT: movb %dil, (%rsi) # encoding: [0x40,0x88,0x3e] 38; CHECK-NEXT: retq # encoding: [0xc3] 39 %c = trunc i32 %x to i1 40 store i1 %c, i1* %y 41 ret void 42} 43 44; The immediate (0x0ffffff0) can be made into an i8 by making it negative. 45 46define i32 @lopped32_32to8(i32 %x) { 47; CHECK-LABEL: lopped32_32to8: 48; CHECK: # %bb.0: 49; CHECK-NEXT: shrl $4, %edi # encoding: [0xc1,0xef,0x04] 50; CHECK-NEXT: andl $-16, %edi # encoding: [0x83,0xe7,0xf0] 51; CHECK-NEXT: movl %edi, %eax # encoding: [0x89,0xf8] 52; CHECK-NEXT: retq # encoding: [0xc3] 53 %shr = lshr i32 %x, 4 54 %and = and i32 %shr, 268435440 55 ret i32 %and 56} 57 58; The immediate (0x0ffffff0) can be made into an i8 by making it negative. 59 60define i64 @lopped64_32to8(i64 %x) { 61; CHECK-LABEL: lopped64_32to8: 62; CHECK: # %bb.0: 63; CHECK-NEXT: shrq $36, %rdi # encoding: [0x48,0xc1,0xef,0x24] 64; CHECK-NEXT: andl $-16, %edi # encoding: [0x83,0xe7,0xf0] 65; CHECK-NEXT: movq %rdi, %rax # encoding: [0x48,0x89,0xf8] 66; CHECK-NEXT: retq # encoding: [0xc3] 67 %shr = lshr i64 %x, 36 68 %and = and i64 %shr, 268435440 69 ret i64 %and 70} 71 72; The immediate (0x0ffffffffffffff0) can be made into an i8 by making it negative. 73 74define i64 @lopped64_64to8(i64 %x) { 75; CHECK-LABEL: lopped64_64to8: 76; CHECK: # %bb.0: 77; CHECK-NEXT: shrq $4, %rdi # encoding: [0x48,0xc1,0xef,0x04] 78; CHECK-NEXT: andq $-16, %rdi # encoding: [0x48,0x83,0xe7,0xf0] 79; CHECK-NEXT: movq %rdi, %rax # encoding: [0x48,0x89,0xf8] 80; CHECK-NEXT: retq # encoding: [0xc3] 81 %shr = lshr i64 %x, 4 82 %and = and i64 %shr, 1152921504606846960 83 ret i64 %and 84} 85 86; The immediate (0x0ffffffffff0fff0) can be made into an i32 by making it negative. 87 88define i64 @lopped64_64to32(i64 %x) { 89; CHECK-LABEL: lopped64_64to32: 90; CHECK: # %bb.0: 91; CHECK-NEXT: shrq $4, %rdi # encoding: [0x48,0xc1,0xef,0x04] 92; CHECK-NEXT: andq $-983056, %rdi # encoding: [0x48,0x81,0xe7,0xf0,0xff,0xf0,0xff] 93; CHECK-NEXT: # imm = 0xFFF0FFF0 94; CHECK-NEXT: movq %rdi, %rax # encoding: [0x48,0x89,0xf8] 95; CHECK-NEXT: retq # encoding: [0xc3] 96 %shr = lshr i64 %x, 4 97 %and = and i64 %shr, 1152921504605863920 98 ret i64 %and 99} 100 101; The transform is not limited to shifts - computeKnownBits() knows the top 4 bits 102; must be cleared, so 0x0fffff80 can become 0x80 sign-extended. 103 104define i32 @shrinkAndKnownBits(i32 %x) { 105; CHECK-LABEL: shrinkAndKnownBits: 106; CHECK: # %bb.0: 107; CHECK-NEXT: movl %edi, %ecx # encoding: [0x89,0xf9] 108; CHECK-NEXT: movl $4042322161, %eax # encoding: [0xb8,0xf1,0xf0,0xf0,0xf0] 109; CHECK-NEXT: # imm = 0xF0F0F0F1 110; CHECK-NEXT: imulq %rcx, %rax # encoding: [0x48,0x0f,0xaf,0xc1] 111; CHECK-NEXT: shrq $36, %rax # encoding: [0x48,0xc1,0xe8,0x24] 112; CHECK-NEXT: andl $-128, %eax # encoding: [0x83,0xe0,0x80] 113; CHECK-NEXT: # kill: def $eax killed $eax killed $rax 114; CHECK-NEXT: retq # encoding: [0xc3] 115 %div = udiv i32 %x, 17 116 %and = and i32 %div, 268435328 117 ret i32 %and 118} 119 120