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7be38fd220
Fixes #3400. The frontend pre-casts the static array operand to the slice type for cases like `bool[4] == bool[]`, but that's not possible in case the static array is non-mutable but the slice type is mutable. So check the element types for equivalence, not the array types, as static arrays and slices are NOT equivalent.
51 lines
2.1 KiB
D
51 lines
2.1 KiB
D
// Tests that dynamic array (in)equality is optimized to a memcmp call when valid.
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// RUN: %ldc -c -output-ll -of=%t.ll %s && FileCheck %s --check-prefix=LLVM < %t.ll
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// RUN: %ldc -c -output-s -O3 -of=%t.s %s && FileCheck %s --check-prefix=ASM < %t.s
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// RUN: %ldc -O0 -run %s
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// RUN: %ldc -O3 -run %s
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module mod;
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// LLVM-LABEL: define{{.*}} @{{.*}}static_dynamic
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// ASM-LABEL: static_dynamic{{.*}}:
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bool static_dynamic(const bool[4] a, bool[] b)
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{
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// LLVM: call i32 @memcmp(
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// Also test that LLVM recognizes and optimizes-out the call to memcmp for 4 byte arrays:
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// ASM-NOT: {{(mem|b)cmp}}
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return a == b;
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}
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// LLVM-LABEL: define{{.*}} @{{.*}}inv_dynamic_dynamic
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// ASM-LABEL: inv_dynamic_dynamic{{.*}}:
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bool inv_dynamic_dynamic(bool[] a, const bool[] b)
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{
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// The front-end turns this into a call to druntime template function `object.__equals!(const(bool), const(bool)).__equals(const(bool)[], const(bool)[])`
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// After optimization (inlining), it should boil down to a length check and a call to memcmp.
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// ASM: {{(mem|b)cmp}}
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return a != b;
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}
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// LLVM-LABEL: define{{.*}} @{{.*}}_D4core8internal5array8equality__T8__equals
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// ASM-LABEL: _D4core8internal5array8equality__T8__equals{{.*}}:
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// LLVM-LABEL: define{{.*}} @_Dmain
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// ASM-LABEL: _Dmain:
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void main()
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{
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assert( static_dynamic([true, false, true, false], [true, false, true, false]));
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assert(!static_dynamic([true, false, true, false], [true, false, true, true]));
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assert(!static_dynamic([true, false, true, false], [true, false, true, false, true]));
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assert(!static_dynamic([true, false, true, false], [true, false, true]));
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assert(!inv_dynamic_dynamic([true, false, true, false], [true, false, true, false]));
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assert( inv_dynamic_dynamic([true, false, true, false], [true, false, true, true]));
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assert( inv_dynamic_dynamic([true, false], [true]));
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assert( inv_dynamic_dynamic([true, false, true, false], [true, false, true]));
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// Make sure that comparing zero-length arrays with ptr=null is allowed.
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bool* ptr = null;
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assert(!inv_dynamic_dynamic(ptr[0..0], ptr[0..0]));
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}
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