derek.holloway
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42 lines
1.3 KiB
C
42 lines
1.3 KiB
C
// RUN: %clang_cc1 %s -emit-llvm -fextend-variable-liveness -o - | FileCheck %s --implicit-check-not=fake.use
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// Make sure we don't generate fake.use for non-scalar variables, unless they
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// are small enough that they may be represented as a scalar in LLVM IR.
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// Make sure we don't generate fake.use for volatile variables
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// and parameters even when they are scalar.
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struct BigAggr {
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unsigned long t;
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char c[1024];
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unsigned char r[32];
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};
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struct SmallAggr {
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int i;
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int j;
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};
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int foo(volatile int vol_param, int param)
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{
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struct BigAggr big;
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struct SmallAggr small;
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volatile int vol_local;
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int local;
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unsigned long_arr[5];
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unsigned short_arr[4];
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return 0;
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}
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// CHECK: [[SMALL_ARR_FAKE_USE:%.+]] = load [4 x i[[#UINT_SIZE:]]], ptr %short_arr
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// CHECK: call void (...) @llvm.fake.use([4 x i[[#UINT_SIZE]]] [[SMALL_ARR_FAKE_USE]])
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// CHECK: [[LOCAL_FAKE_USE:%.+]] = load i32, ptr %local
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// CHECK: call void (...) @llvm.fake.use(i32 [[LOCAL_FAKE_USE]])
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// CHECK: [[SMALL_FAKE_USE:%.+]] = load %struct.SmallAggr, ptr %small
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// CHECK: call void (...) @llvm.fake.use(%struct.SmallAggr [[SMALL_FAKE_USE]])
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// CHECK: [[PARAM_FAKE_USE:%.+]] = load i32, ptr %param.addr
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// CHECK: call void (...) @llvm.fake.use(i32 [[PARAM_FAKE_USE]])
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// CHECK: declare void @llvm.fake.use
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