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129 lines
4.4 KiB
LLVM
129 lines
4.4 KiB
LLVM
; RUN: llc -fixup-byte-word-insts=1 -march=x86-64 < %s | \
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; RUN: FileCheck -check-prefix CHECK -check-prefix BWON %s
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; RUN: llc -fixup-byte-word-insts=0 -march=x86-64 < %s | \
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; RUN: FileCheck -check-prefix CHECK -check-prefix BWOFF %s
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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"
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target triple = "x86_64-apple-macosx10.8.0"
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%struct.A = type { i8, i8, i8, i8, i8, i8, i8, i8 }
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; This has byte loads interspersed with byte stores, in a single
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; basic-block loop. The upper portion should be dead, so the movb loads
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; should have been changed into movzbl instead.
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; TODO: The second movb load doesn't get fixed due to register liveness
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; not being accurate enough.
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; CHECK-LABEL: foo1
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; load:
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; BWON: movzbl
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; BWOFF: movb
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; store:
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; CHECK: movb
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; load:
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; CHECK: movb
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; store:
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; CHECK: movb
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; CHECK: ret
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define void @foo1(i32 %count,
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%struct.A* noalias nocapture %q,
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%struct.A* noalias nocapture %p)
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nounwind uwtable noinline ssp {
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%1 = icmp sgt i32 %count, 0
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br i1 %1, label %.lr.ph, label %._crit_edge
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.lr.ph: ; preds = %0
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%2 = getelementptr inbounds %struct.A, %struct.A* %q, i64 0, i32 0
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%3 = getelementptr inbounds %struct.A, %struct.A* %q, i64 0, i32 1
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br label %a4
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a4: ; preds = %4, %.lr.ph
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%i.02 = phi i32 [ 0, %.lr.ph ], [ %a9, %a4 ]
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%.01 = phi %struct.A* [ %p, %.lr.ph ], [ %a10, %a4 ]
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%a5 = load i8, i8* %2, align 1
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%a7 = getelementptr inbounds %struct.A, %struct.A* %.01, i64 0, i32 0
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store i8 %a5, i8* %a7, align 1
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%a8 = getelementptr inbounds %struct.A, %struct.A* %.01, i64 0, i32 1
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%a6 = load i8, i8* %3, align 1
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store i8 %a6, i8* %a8, align 1
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%a9 = add nsw i32 %i.02, 1
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%a10 = getelementptr inbounds %struct.A, %struct.A* %.01, i64 1
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%exitcond = icmp eq i32 %a9, %count
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br i1 %exitcond, label %._crit_edge, label %a4
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._crit_edge: ; preds = %4, %0
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ret void
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}
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%struct.B = type { i16, i16, i16, i16, i16, i16, i16, i16 }
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; This has word loads interspersed with word stores.
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; The upper portion should be dead, so the movw loads should have
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; been changed into movzwl instead.
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; TODO: The second movw load doesn't get fixed due to register liveness
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; not being accurate enough.
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; CHECK-LABEL: foo2
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; load:
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; BWON: movzwl
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; BWOFF: movw
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; store:
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; CHECK: movw
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; load:
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; CHECK: movw
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; store:
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; CHECK: movw
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; CHECK: ret
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define void @foo2(i32 %count,
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%struct.B* noalias nocapture %q,
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%struct.B* noalias nocapture %p)
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nounwind uwtable noinline ssp {
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%1 = icmp sgt i32 %count, 0
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br i1 %1, label %.lr.ph, label %._crit_edge
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.lr.ph: ; preds = %0
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%2 = getelementptr inbounds %struct.B, %struct.B* %q, i64 0, i32 0
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%3 = getelementptr inbounds %struct.B, %struct.B* %q, i64 0, i32 1
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br label %a4
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a4: ; preds = %4, %.lr.ph
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%i.02 = phi i32 [ 0, %.lr.ph ], [ %a9, %a4 ]
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%.01 = phi %struct.B* [ %p, %.lr.ph ], [ %a10, %a4 ]
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%a5 = load i16, i16* %2, align 2
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%a7 = getelementptr inbounds %struct.B, %struct.B* %.01, i64 0, i32 0
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store i16 %a5, i16* %a7, align 2
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%a8 = getelementptr inbounds %struct.B, %struct.B* %.01, i64 0, i32 1
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%a6 = load i16, i16* %3, align 2
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store i16 %a6, i16* %a8, align 2
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%a9 = add nsw i32 %i.02, 1
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%a10 = getelementptr inbounds %struct.B, %struct.B* %.01, i64 1
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%exitcond = icmp eq i32 %a9, %count
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br i1 %exitcond, label %._crit_edge, label %a4
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._crit_edge: ; preds = %4, %0
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ret void
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}
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; This test contains nothing but a simple byte load and store. Since
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; movb encodes smaller, we do not want to use movzbl unless in a tight loop.
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; So this test checks that movb is used.
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; CHECK-LABEL: foo3:
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; CHECK: movb
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; CHECK: movb
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define void @foo3(i8 *%dst, i8 *%src) {
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%t0 = load i8, i8 *%src, align 1
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store i8 %t0, i8 *%dst, align 1
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ret void
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}
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; This test contains nothing but a simple word load and store. Since
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; movw and movzwl are the same size, we should always choose to use
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; movzwl instead.
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; CHECK-LABEL: foo4:
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; BWON: movzwl
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; BWOFF: movw
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; CHECK: movw
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define void @foo4(i16 *%dst, i16 *%src) {
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%t0 = load i16, i16 *%src, align 2
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store i16 %t0, i16 *%dst, align 2
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ret void
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}
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