derek.holloway
7502bf64a4
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43 lines
2.1 KiB
LLVM
43 lines
2.1 KiB
LLVM
; RUN: opt < %s -passes=instcombine -S | FileCheck %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-macosx10.9.0"
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%struct._my_struct = type <{ [12 x i8], [4 x i8] }>
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@initval = common global %struct._my_struct zeroinitializer, align 1
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; InstCombine will try to change the %struct._my_struct alloca into an
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; allocation of an i96 because of the bitcast to create %2. That's not valid,
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; as the other 32 bits of the structure still feed into the return value
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define { i64, i64 } @function(i32 %x, i32 %y, i32 %z) nounwind {
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; CHECK-LABEL: @function(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %retval = alloca %struct._my_struct, align 8
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; CHECK-NOT: bitcast ptr %retval to ptr
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entry:
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%retval = alloca %struct._my_struct, align 8
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%k.sroa.0.0.copyload = load i96, ptr @initval, align 1
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%k.sroa.1.12.copyload = load i32, ptr getelementptr inbounds (%struct._my_struct, ptr @initval, i64 0, i32 1), align 1
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%0 = zext i32 %x to i96
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%bf.value = shl nuw nsw i96 %0, 6
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%bf.clear = and i96 %k.sroa.0.0.copyload, -288230376151711744
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%1 = zext i32 %y to i96
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%bf.value2 = shl nuw nsw i96 %1, 32
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%bf.shl3 = and i96 %bf.value2, 288230371856744448
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%bf.value.masked = and i96 %bf.value, 4294967232
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%2 = zext i32 %z to i96
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%bf.value8 = and i96 %2, 63
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%bf.clear4 = or i96 %bf.shl3, %bf.value.masked
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%bf.set5 = or i96 %bf.clear4, %bf.value8
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%bf.set10 = or i96 %bf.set5, %bf.clear
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store i96 %bf.set10, ptr %retval, align 8
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%retval.12.idx8 = getelementptr inbounds %struct._my_struct, ptr %retval, i64 0, i32 1
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store i32 %k.sroa.1.12.copyload, ptr %retval.12.idx8, align 4
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%trunc = trunc i96 %bf.set10 to i64
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%.fca.0.insert = insertvalue { i64, i64 } undef, i64 %trunc, 0
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%retval.8.idx12 = getelementptr inbounds %struct._my_struct, ptr %retval, i64 0, i32 0, i64 8
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%retval.8.load14 = load i64, ptr %retval.8.idx12, align 8
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%.fca.1.insert = insertvalue { i64, i64 } %.fca.0.insert, i64 %retval.8.load14, 1
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ret { i64, i64 } %.fca.1.insert
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}
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