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84e2a568ca
For example: hoist out of loops where the loop count could be 0. We did this on purpose. But, if not wrong, it's at least very confusing if the initializer has observable side effects. Instead let CSE and LICM do the job and handle initializer side-effects correctly. rdar://problem/60292679
56 lines
2.1 KiB
Plaintext
56 lines
2.1 KiB
Plaintext
// RUN: %target-sil-opt -enable-sil-verify-all %s -global-opt | %FileCheck %s
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sil_stage canonical
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import Builtin
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import Swift
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private var testGlobal: Int64
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sil_global private @globalinit_33_00F4D2139E6BDDFEC71E5005B67B5674_token0 : $Builtin.Word
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sil_global private @$s4test10testGlobalSivp : $Int64
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sil private @globalinit_33_00F4D2139E6BDDFEC71E5005B67B5674_func0 : $@convention(c) () -> () {
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bb0:
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alloc_global @$s4test10testGlobalSivp
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%1 = global_addr @$s4test10testGlobalSivp : $*Int64
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%2 = integer_literal $Builtin.Int64, 27
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%3 = struct $Int64 (%2 : $Builtin.Int64)
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store %3 to %1 : $*Int64
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%5 = tuple ()
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return %5 : $()
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}
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sil hidden [global_init] @$s4test10testGlobalSivau : $@convention(thin) () -> Builtin.RawPointer {
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bb0:
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%0 = global_addr @globalinit_33_00F4D2139E6BDDFEC71E5005B67B5674_token0 : $*Builtin.Word
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%1 = address_to_pointer %0 : $*Builtin.Word to $Builtin.RawPointer
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%2 = function_ref @globalinit_33_00F4D2139E6BDDFEC71E5005B67B5674_func0 : $@convention(c) () -> ()
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%3 = builtin "once"(%1 : $Builtin.RawPointer, %2 : $@convention(c) () -> ()) : $()
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%4 = global_addr @$s4test10testGlobalSivp : $*Int64
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%5 = address_to_pointer %4 : $*Int64 to $Builtin.RawPointer
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return %5 : $Builtin.RawPointer
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}
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// CHECK-LABEL: sil @dont_propagate_global_with_multiple_writes
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// CHECK: [[V:%[0-9]+]] = load
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// CHECK: return [[V]]
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// CHECK: } // end sil function 'dont_propagate_global_with_multiple_writes'
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sil @dont_propagate_global_with_multiple_writes : $@convention(thin) (Int64) -> Int64 {
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bb0(%0 : $Int64):
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%2 = function_ref @$s4test10testGlobalSivau : $@convention(thin) () -> Builtin.RawPointer
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%3 = apply %2() : $@convention(thin) () -> Builtin.RawPointer
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%4 = pointer_to_address %3 : $Builtin.RawPointer to [strict] $*Int64
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%5 = integer_literal $Builtin.Int64, 42
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%6 = struct $Int64 (%5 : $Builtin.Int64)
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%7 = begin_access [modify] [dynamic] [no_nested_conflict] %4 : $*Int64
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store %6 to %7 : $*Int64
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end_access %7 : $*Int64
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%33 = begin_access [read] [dynamic] [no_nested_conflict] %4 : $*Int64
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%35 = load %33 : $*Int64
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end_access %33 : $*Int64
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return %35 : $Int64
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}
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