1 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py 2 ; RUN: llc -o - %s -mtriple=x86_64--unknown-linux-gnu | FileCheck %s 3 4 @base = external dso_local local_unnamed_addr global i16, align 2 5 6 ; We should be able to merge the two loads here 7 define i16 @unify_through_trivial_asm() { 8 ; CHECK-LABEL: unify_through_trivial_asm: 9 ; CHECK: # %bb.0: 10 ; CHECK-NEXT: movzwl {{.*}}(%rip), %eax 11 ; CHECK-NEXT: #APP 12 ; CHECK-NEXT: nop 13 ; CHECK-NEXT: #NO_APP 14 ; CHECK-NEXT: movzwl {{.*}}(%rip), %eax 15 ; CHECK-NEXT: incl %eax 16 ; CHECK-NEXT: # kill: def $ax killed $ax killed $eax 17 ; CHECK-NEXT: retq 18 %x = load i16, i16* @base, align 2 19 tail call void asm sideeffect "nop", "r,~{dirflag},~{fpsr},~{flags}"(i16 %x) 20 %x2 = load i16, i16* @base, align 2 21 %v = add i16 %x2, 1 22 ret i16 %v 23 } 24 25 ; The asm call prevents the merging the loads here. 26 define i16 @unify_through_trival_asm_w_memory_clobber() { 27 ; CHECK-LABEL: unify_through_trival_asm_w_memory_clobber: 28 ; CHECK: # %bb.0: 29 ; CHECK-NEXT: movzwl {{.*}}(%rip), %eax 30 ; CHECK-NEXT: #APP 31 ; CHECK-NEXT: nop 32 ; CHECK-NEXT: #NO_APP 33 ; CHECK-NEXT: movzwl {{.*}}(%rip), %eax 34 ; CHECK-NEXT: incl %eax 35 ; CHECK-NEXT: # kill: def $ax killed $ax killed $eax 36 ; CHECK-NEXT: retq 37 %x = load i16, i16* @base, align 2 38 tail call void asm sideeffect "nop", "+r,~{dirflag},~{fpsr},~{flags},~{base},~{memory}"(i16 %x) 39 %x2 = load i16, i16* @base, align 2 40 %v = add i16 %x2, 1 41 ret i16 %v 42 } 43 44 define dso_local void @fulltest() local_unnamed_addr { 45 ; CHECK-LABEL: fulltest: 46 ; CHECK: # %bb.0: # %entry 47 ; CHECK-NEXT: movzwl {{.*}}(%rip), %edx 48 ; CHECK-NEXT: addl $16, %edx 49 ; CHECK-NEXT: xorl %eax, %eax 50 ; CHECK-NEXT: # kill: def $dx killed $dx killed $edx 51 ; CHECK-NEXT: #APP 52 ; CHECK-NEXT: outb %al, %dx 53 ; CHECK-NEXT: #NO_APP 54 ; CHECK-NEXT: movzwl {{.*}}(%rip), %edx 55 ; CHECK-NEXT: addl $16, %edx 56 ; CHECK-NEXT: movb $1, %al 57 ; CHECK-NEXT: # kill: def $dx killed $dx killed $edx 58 ; CHECK-NEXT: #APP 59 ; CHECK-NEXT: outb %al, %dx 60 ; CHECK-NEXT: #NO_APP 61 ; CHECK-NEXT: movzwl {{.*}}(%rip), %edx 62 ; CHECK-NEXT: addl $16, %edx 63 ; CHECK-NEXT: movb $2, %al 64 ; CHECK-NEXT: # kill: def $dx killed $dx killed $edx 65 ; CHECK-NEXT: #APP 66 ; CHECK-NEXT: outb %al, %dx 67 ; CHECK-NEXT: #NO_APP 68 ; CHECK-NEXT: movzwl {{.*}}(%rip), %edx 69 ; CHECK-NEXT: addl $16, %edx 70 ; CHECK-NEXT: movb $3, %al 71 ; CHECK-NEXT: # kill: def $dx killed $dx killed $edx 72 ; CHECK-NEXT: #APP 73 ; CHECK-NEXT: outb %al, %dx 74 ; CHECK-NEXT: #NO_APP 75 ; CHECK-NEXT: movzwl {{.*}}(%rip), %edx 76 ; CHECK-NEXT: addl $16, %edx 77 ; CHECK-NEXT: movb $4, %al 78 ; CHECK-NEXT: # kill: def $dx killed $dx killed $edx 79 ; CHECK-NEXT: #APP 80 ; CHECK-NEXT: outb %al, %dx 81 ; CHECK-NEXT: #NO_APP 82 ; CHECK-NEXT: movzwl {{.*}}(%rip), %edx 83 ; CHECK-NEXT: addl $16, %edx 84 ; CHECK-NEXT: movb $5, %al 85 ; CHECK-NEXT: # kill: def $dx killed $dx killed $edx 86 ; CHECK-NEXT: #APP 87 ; CHECK-NEXT: outb %al, %dx 88 ; CHECK-NEXT: #NO_APP 89 ; CHECK-NEXT: movzwl {{.*}}(%rip), %edx 90 ; CHECK-NEXT: addl $16, %edx 91 ; CHECK-NEXT: movb $6, %al 92 ; CHECK-NEXT: # kill: def $dx killed $dx killed $edx 93 ; CHECK-NEXT: #APP 94 ; CHECK-NEXT: outb %al, %dx 95 ; CHECK-NEXT: #NO_APP 96 ; CHECK-NEXT: movzwl {{.*}}(%rip), %edx 97 ; CHECK-NEXT: addl $16, %edx 98 ; CHECK-NEXT: movb $7, %al 99 ; CHECK-NEXT: # kill: def $dx killed $dx killed $edx 100 ; CHECK-NEXT: #APP 101 ; CHECK-NEXT: outb %al, %dx 102 ; CHECK-NEXT: #NO_APP 103 ; CHECK-NEXT: movzwl {{.*}}(%rip), %edx 104 ; CHECK-NEXT: addl $16, %edx 105 ; CHECK-NEXT: movb $8, %al 106 ; CHECK-NEXT: # kill: def $dx killed $dx killed $edx 107 ; CHECK-NEXT: #APP 108 ; CHECK-NEXT: outb %al, %dx 109 ; CHECK-NEXT: #NO_APP 110 ; CHECK-NEXT: retq 111 entry: 112 %0 = load i16, i16* @base, align 2 113 %add = add i16 %0, 16 114 tail call void asm sideeffect "outb %al,${1:w}", "{ax},{dx},~{dirflag},~{fpsr},~{flags}"(i8 0, i16 %add) 115 %1 = load i16, i16* @base, align 2 116 %add3 = add i16 %1, 16 117 tail call void asm sideeffect "outb %al,${1:w}", "{ax},{dx},~{dirflag},~{fpsr},~{flags}"(i8 1, i16 %add3) 118 %2 = load i16, i16* @base, align 2 119 %add6 = add i16 %2, 16 120 tail call void asm sideeffect "outb %al,${1:w}", "{ax},{dx},~{dirflag},~{fpsr},~{flags}"(i8 2, i16 %add6) 121 %3 = load i16, i16* @base, align 2 122 %add9 = add i16 %3, 16 123 tail call void asm sideeffect "outb %al,${1:w}", "{ax},{dx},~{dirflag},~{fpsr},~{flags}"(i8 3, i16 %add9) 124 %4 = load i16, i16* @base, align 2 125 %add12 = add i16 %4, 16 126 tail call void asm sideeffect "outb %al,${1:w}", "{ax},{dx},~{dirflag},~{fpsr},~{flags}"(i8 4, i16 %add12) 127 %5 = load i16, i16* @base, align 2 128 %add15 = add i16 %5, 16 129 tail call void asm sideeffect "outb %al,${1:w}", "{ax},{dx},~{dirflag},~{fpsr},~{flags}"(i8 5, i16 %add15) 130 %6 = load i16, i16* @base, align 2 131 %add18 = add i16 %6, 16 132 tail call void asm sideeffect "outb %al,${1:w}", "{ax},{dx},~{dirflag},~{fpsr},~{flags}"(i8 6, i16 %add18) 133 %7 = load i16, i16* @base, align 2 134 %add21 = add i16 %7, 16 135 tail call void asm sideeffect "outb %al,${1:w}", "{ax},{dx},~{dirflag},~{fpsr},~{flags}"(i8 7, i16 %add21) 136 %8 = load i16, i16* @base, align 2 137 %add24 = add i16 %8, 16 138 tail call void asm sideeffect "outb %al,${1:w}", "{ax},{dx},~{dirflag},~{fpsr},~{flags}"(i8 8, i16 %add24) 139 ret void 140 } 141
