1 ; RUN: llc -fixup-byte-word-insts=1 -march=x86-64 < %s | \ 2 ; RUN: FileCheck -check-prefix CHECK -check-prefix BWON %s 3 ; RUN: llc -fixup-byte-word-insts=0 -march=x86-64 < %s | \ 4 ; RUN: FileCheck -check-prefix CHECK -check-prefix BWOFF %s 5 6 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" 7 target triple = "x86_64-apple-macosx10.8.0" 8 9 %struct.A = type { i8, i8, i8, i8, i8, i8, i8, i8 } 10 11 ; This has byte loads interspersed with byte stores, in a single 12 ; basic-block loop. The upper portion should be dead, so the movb loads 13 ; should have been changed into movzbl instead. 14 ; CHECK-LABEL: foo1 15 ; load: 16 ; BWON: movzbl 17 ; BWOFF: movb 18 ; store: 19 ; CHECK: movb 20 ; load: 21 ; BWON: movzbl 22 ; BWOFF: movb 23 ; store: 24 ; CHECK: movb 25 ; CHECK: ret 26 define void @foo1(i32 %count, 27 %struct.A* noalias nocapture %q, 28 %struct.A* noalias nocapture %p) 29 nounwind uwtable noinline ssp { 30 %1 = icmp sgt i32 %count, 0 31 br i1 %1, label %.lr.ph, label %._crit_edge 32 33 .lr.ph: ; preds = %0 34 %2 = getelementptr inbounds %struct.A, %struct.A* %q, i64 0, i32 0 35 %3 = getelementptr inbounds %struct.A, %struct.A* %q, i64 0, i32 1 36 br label %a4 37 38 a4: ; preds = %4, %.lr.ph 39 %i.02 = phi i32 [ 0, %.lr.ph ], [ %a9, %a4 ] 40 %.01 = phi %struct.A* [ %p, %.lr.ph ], [ %a10, %a4 ] 41 %a5 = load i8, i8* %2, align 1 42 %a7 = getelementptr inbounds %struct.A, %struct.A* %.01, i64 0, i32 0 43 store i8 %a5, i8* %a7, align 1 44 %a8 = getelementptr inbounds %struct.A, %struct.A* %.01, i64 0, i32 1 45 %a6 = load i8, i8* %3, align 1 46 store i8 %a6, i8* %a8, align 1 47 %a9 = add nsw i32 %i.02, 1 48 %a10 = getelementptr inbounds %struct.A, %struct.A* %.01, i64 1 49 %exitcond = icmp eq i32 %a9, %count 50 br i1 %exitcond, label %._crit_edge, label %a4 51 52 ._crit_edge: ; preds = %4, %0 53 ret void 54 } 55 56 %struct.B = type { i16, i16, i16, i16, i16, i16, i16, i16 } 57 58 ; This has word loads interspersed with word stores. 59 ; The upper portion should be dead, so the movw loads should have 60 ; been changed into movzwl instead. 61 ; CHECK-LABEL: foo2 62 ; load: 63 ; BWON: movzwl 64 ; BWOFF: movw 65 ; store: 66 ; CHECK: movw 67 ; load: 68 ; BWON: movzwl 69 ; BWOFF: movw 70 ; store: 71 ; CHECK: movw 72 ; CHECK: ret 73 define void @foo2(i32 %count, 74 %struct.B* noalias nocapture %q, 75 %struct.B* noalias nocapture %p) 76 nounwind uwtable noinline ssp { 77 %1 = icmp sgt i32 %count, 0 78 br i1 %1, label %.lr.ph, label %._crit_edge 79 80 .lr.ph: ; preds = %0 81 %2 = getelementptr inbounds %struct.B, %struct.B* %q, i64 0, i32 0 82 %3 = getelementptr inbounds %struct.B, %struct.B* %q, i64 0, i32 1 83 br label %a4 84 85 a4: ; preds = %4, %.lr.ph 86 %i.02 = phi i32 [ 0, %.lr.ph ], [ %a9, %a4 ] 87 %.01 = phi %struct.B* [ %p, %.lr.ph ], [ %a10, %a4 ] 88 %a5 = load i16, i16* %2, align 2 89 %a7 = getelementptr inbounds %struct.B, %struct.B* %.01, i64 0, i32 0 90 store i16 %a5, i16* %a7, align 2 91 %a8 = getelementptr inbounds %struct.B, %struct.B* %.01, i64 0, i32 1 92 %a6 = load i16, i16* %3, align 2 93 store i16 %a6, i16* %a8, align 2 94 %a9 = add nsw i32 %i.02, 1 95 %a10 = getelementptr inbounds %struct.B, %struct.B* %.01, i64 1 96 %exitcond = icmp eq i32 %a9, %count 97 br i1 %exitcond, label %._crit_edge, label %a4 98 99 ._crit_edge: ; preds = %4, %0 100 ret void 101 } 102 103 ; This test contains nothing but a simple byte load and store. Since 104 ; movb encodes smaller, we do not want to use movzbl unless in a tight loop. 105 ; So this test checks that movb is used. 106 ; CHECK-LABEL: foo3: 107 ; CHECK: movb 108 ; CHECK: movb 109 define void @foo3(i8 *%dst, i8 *%src) { 110 %t0 = load i8, i8 *%src, align 1 111 store i8 %t0, i8 *%dst, align 1 112 ret void 113 } 114 115 ; This test contains nothing but a simple word load and store. Since 116 ; movw and movzwl are the same size, we should always choose to use 117 ; movzwl instead. 118 ; CHECK-LABEL: foo4: 119 ; BWON: movzwl 120 ; BWOFF: movw 121 ; CHECK: movw 122 define void @foo4(i16 *%dst, i16 *%src) { 123 %t0 = load i16, i16 *%src, align 2 124 store i16 %t0, i16 *%dst, align 2 125 ret void 126 } 127
