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9ad6839f7a
There's an old note in the code to do this, and now that LLVM-C has an API for it, we might as well.
91 lines
3.3 KiB
Rust
91 lines
3.3 KiB
Rust
//@ compile-flags: -Copt-level=3 -Zmerge-functions=disabled
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#![crate_type = "lib"]
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use std::num::NonZero;
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// #71602 reported a simple array comparison just generating a loop.
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// This was originally fixed by ensuring it generates a single bcmp,
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// but we now generate it as a load+icmp instead. `is_zero_slice` was
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// tweaked to still test the case of comparison against a slice,
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// and `is_zero_array` tests the new array-specific behaviour.
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// The optimization was then extended to short slice-to-array comparisons,
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// so the first test here now has a long slice to still get the bcmp.
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// CHECK-LABEL: @is_zero_slice_long
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#[no_mangle]
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pub fn is_zero_slice_long(data: &[u8; 456]) -> bool {
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// CHECK: %[[BCMP:.+]] = tail call i32 @{{bcmp|memcmp}}({{.+}})
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// CHECK-NEXT: %[[EQ:.+]] = icmp eq i32 %[[BCMP]], 0
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// CHECK-NEXT: ret i1 %[[EQ]]
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&data[..] == [0; 456]
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}
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// CHECK-LABEL: @is_zero_slice_short
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#[no_mangle]
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pub fn is_zero_slice_short(data: &[u8; 4]) -> bool {
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// CHECK: %[[LOAD:.+]] = load i32, ptr %{{.+}}, align 1
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// CHECK-NEXT: %[[EQ:.+]] = icmp eq i32 %[[LOAD]], 0
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// CHECK-NEXT: ret i1 %[[EQ]]
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&data[..] == [0; 4]
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}
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// CHECK-LABEL: @is_zero_array
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#[no_mangle]
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pub fn is_zero_array(data: &[u8; 4]) -> bool {
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// CHECK: %[[LOAD:.+]] = load i32, ptr %{{.+}}, align 1
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// CHECK-NEXT: %[[EQ:.+]] = icmp eq i32 %[[LOAD]], 0
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// CHECK-NEXT: ret i1 %[[EQ]]
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*data == [0; 4]
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}
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// The following test the extra specializations to make sure that slice
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// equality for non-byte types also just emit a `bcmp`, not a loop.
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// CHECK-LABEL: @eq_slice_of_nested_u8(
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// CHECK-SAME: [[USIZE:i16|i32|i64]] noundef %x.1
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// CHECK-SAME: [[USIZE]] noundef %y.1
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#[no_mangle]
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fn eq_slice_of_nested_u8(x: &[[u8; 3]], y: &[[u8; 3]]) -> bool {
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// CHECK: icmp eq [[USIZE]] %x.1, %y.1
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// CHECK: %[[BYTES:.+]] = mul nuw nsw [[USIZE]] {{%x.1|%y.1}}, 3
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// CHECK: tail call{{( noundef)?}} i32 @{{bcmp|memcmp}}(ptr
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// CHECK-SAME: , [[USIZE]]{{( noundef)?}} %[[BYTES]])
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x == y
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}
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// CHECK-LABEL: @eq_slice_of_i32(
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// CHECK-SAME: [[USIZE:i16|i32|i64]] noundef %x.1
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// CHECK-SAME: [[USIZE]] noundef %y.1
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#[no_mangle]
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fn eq_slice_of_i32(x: &[i32], y: &[i32]) -> bool {
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// CHECK: icmp eq [[USIZE]] %x.1, %y.1
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// CHECK: %[[BYTES:.+]] = shl nuw nsw [[USIZE]] {{%x.1|%y.1}}, 2
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// CHECK: tail call{{( noundef)?}} i32 @{{bcmp|memcmp}}(ptr
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// CHECK-SAME: , [[USIZE]]{{( noundef)?}} %[[BYTES]])
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x == y
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}
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// CHECK-LABEL: @eq_slice_of_nonzero(
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// CHECK-SAME: [[USIZE:i16|i32|i64]] noundef %x.1
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// CHECK-SAME: [[USIZE]] noundef %y.1
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#[no_mangle]
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fn eq_slice_of_nonzero(x: &[NonZero<i32>], y: &[NonZero<i32>]) -> bool {
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// CHECK: icmp eq [[USIZE]] %x.1, %y.1
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// CHECK: %[[BYTES:.+]] = shl nuw nsw [[USIZE]] {{%x.1|%y.1}}, 2
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// CHECK: tail call{{( noundef)?}} i32 @{{bcmp|memcmp}}(ptr
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// CHECK-SAME: , [[USIZE]]{{( noundef)?}} %[[BYTES]])
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x == y
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}
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// CHECK-LABEL: @eq_slice_of_option_of_nonzero(
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// CHECK-SAME: [[USIZE:i16|i32|i64]] noundef %x.1
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// CHECK-SAME: [[USIZE]] noundef %y.1
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#[no_mangle]
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fn eq_slice_of_option_of_nonzero(x: &[Option<NonZero<i16>>], y: &[Option<NonZero<i16>>]) -> bool {
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// CHECK: icmp eq [[USIZE]] %x.1, %y.1
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// CHECK: %[[BYTES:.+]] = shl nuw nsw [[USIZE]] {{%x.1|%y.1}}, 1
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// CHECK: tail call{{( noundef)?}} i32 @{{bcmp|memcmp}}(ptr
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// CHECK-SAME: , [[USIZE]]{{( noundef)?}} %[[BYTES]])
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x == y
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}
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