derek.holloway
7502bf64a4
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99 lines
3.1 KiB
LLVM
99 lines
3.1 KiB
LLVM
; RUN: llc < %s -mtriple=armv7-apple-darwin | FileCheck %s
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; Make sure that we merge the consecutive load/store sequence below and use a
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; word (16 bit) instead of a byte copy.
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; CHECK: MergeLoadStoreBaseIndexOffset
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; CHECK: ldrh [[REG:r[0-9]+]], [{{.*}}]
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; CHECK: strh [[REG]], [r1], #2
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define void @MergeLoadStoreBaseIndexOffset(ptr %a, ptr %b, ptr %c, i32 %n) {
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br label %1
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; <label>:1
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%.09 = phi i32 [ %n, %0 ], [ %11, %1 ]
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%.08 = phi ptr [ %b, %0 ], [ %10, %1 ]
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%.0 = phi ptr [ %a, %0 ], [ %2, %1 ]
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%2 = getelementptr inbounds i32, ptr %.0, i32 1
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%3 = load i32, ptr %.0, align 1
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%4 = getelementptr inbounds i8, ptr %c, i32 %3
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%5 = load i8, ptr %4, align 1
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%6 = add i32 %3, 1
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%7 = getelementptr inbounds i8, ptr %c, i32 %6
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%8 = load i8, ptr %7, align 1
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store i8 %5, ptr %.08, align 1
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%9 = getelementptr inbounds i8, ptr %.08, i32 1
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store i8 %8, ptr %9, align 1
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%10 = getelementptr inbounds i8, ptr %.08, i32 2
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%11 = add nsw i32 %.09, -1
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%12 = icmp eq i32 %11, 0
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br i1 %12, label %13, label %1
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; <label>:13
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ret void
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}
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; Make sure that we merge the consecutive load/store sequence below and use a
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; word (16 bit) instead of a byte copy even if there are intermediate sign
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; extensions.
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; CHECK: MergeLoadStoreBaseIndexOffsetSext
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; CHECK: ldrh [[REG:r[0-9]+]], [{{.*}}]
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; CHECK: strh [[REG]], [r1], #2
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define void @MergeLoadStoreBaseIndexOffsetSext(ptr %a, ptr %b, ptr %c, i32 %n) {
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br label %1
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; <label>:1
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%.09 = phi i32 [ %n, %0 ], [ %12, %1 ]
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%.08 = phi ptr [ %b, %0 ], [ %11, %1 ]
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%.0 = phi ptr [ %a, %0 ], [ %2, %1 ]
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%2 = getelementptr inbounds i8, ptr %.0, i32 1
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%3 = load i8, ptr %.0, align 1
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%4 = sext i8 %3 to i32
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%5 = getelementptr inbounds i8, ptr %c, i32 %4
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%6 = load i8, ptr %5, align 1
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%7 = add i32 %4, 1
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%8 = getelementptr inbounds i8, ptr %c, i32 %7
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%9 = load i8, ptr %8, align 1
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store i8 %6, ptr %.08, align 1
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%10 = getelementptr inbounds i8, ptr %.08, i32 1
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store i8 %9, ptr %10, align 1
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%11 = getelementptr inbounds i8, ptr %.08, i32 2
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%12 = add nsw i32 %.09, -1
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%13 = icmp eq i32 %12, 0
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br i1 %13, label %14, label %1
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; <label>:14
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ret void
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}
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; However, we can only merge ignore sign extensions when they are on all memory
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; computations;
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; CHECK: loadStoreBaseIndexOffsetSextNoSex
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; CHECK-NOT: ldrh [[REG:r[0-9]+]], [{{.*}}]
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; CHECK-NOT: strh [[REG]], [r1], #2
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define void @loadStoreBaseIndexOffsetSextNoSex(ptr %a, ptr %b, ptr %c, i32 %n) {
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br label %1
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; <label>:1
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%.09 = phi i32 [ %n, %0 ], [ %12, %1 ]
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%.08 = phi ptr [ %b, %0 ], [ %11, %1 ]
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%.0 = phi ptr [ %a, %0 ], [ %2, %1 ]
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%2 = getelementptr inbounds i8, ptr %.0, i32 1
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%3 = load i8, ptr %.0, align 1
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%4 = sext i8 %3 to i32
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%5 = getelementptr inbounds i8, ptr %c, i32 %4
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%6 = load i8, ptr %5, align 1
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%7 = add i8 %3, 1
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%wrap.4 = sext i8 %7 to i32
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%8 = getelementptr inbounds i8, ptr %c, i32 %wrap.4
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%9 = load i8, ptr %8, align 1
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store i8 %6, ptr %.08, align 1
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%10 = getelementptr inbounds i8, ptr %.08, i32 1
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store i8 %9, ptr %10, align 1
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%11 = getelementptr inbounds i8, ptr %.08, i32 2
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%12 = add nsw i32 %.09, -1
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%13 = icmp eq i32 %12, 0
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br i1 %13, label %14, label %1
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; <label>:14
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ret void
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}
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