Copy 1-element arrays as scalars, not vectors
For `[T; 1]` it's silly to copy as `<1 x T>` when we can just copy as `T`.
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4 changed files with 80 additions and 1 deletions
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@ -32,3 +32,25 @@ pub fn array_copy(a: &[u8; 4], p: &mut [u8; 4]) {
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// CHECK: store <4 x i8> %[[TEMP2]], ptr %p, align 1
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*p = *a;
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}
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// CHECK-LABEL: @array_copy_1_element
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#[no_mangle]
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pub fn array_copy_1_element(a: &[u8; 1], p: &mut [u8; 1]) {
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// CHECK: %[[LOCAL:.+]] = alloca [1 x i8], align 1
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// CHECK: %[[TEMP1:.+]] = load i8, ptr %a, align 1
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// CHECK: store i8 %[[TEMP1]], ptr %[[LOCAL]], align 1
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// CHECK: %[[TEMP2:.+]] = load i8, ptr %[[LOCAL]], align 1
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// CHECK: store i8 %[[TEMP2]], ptr %p, align 1
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*p = *a;
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}
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// CHECK-LABEL: @array_copy_2_elements
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#[no_mangle]
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pub fn array_copy_2_elements(a: &[u8; 2], p: &mut [u8; 2]) {
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// CHECK: %[[LOCAL:.+]] = alloca [2 x i8], align 1
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// CHECK: %[[TEMP1:.+]] = load <2 x i8>, ptr %a, align 1
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// CHECK: store <2 x i8> %[[TEMP1]], ptr %[[LOCAL]], align 1
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// CHECK: %[[TEMP2:.+]] = load <2 x i8>, ptr %[[LOCAL]], align 1
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// CHECK: store <2 x i8> %[[TEMP2]], ptr %p, align 1
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*p = *a;
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}
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