130 lines
3.9 KiB
Rust
130 lines
3.9 KiB
Rust
//@ compile-flags: -Copt-level=3 -C no-prepopulate-passes
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//@ only-64bit (because these discriminants are isize)
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#![crate_type = "lib"]
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// This directly tests what we emit for these matches, rather than what happens
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// after optimization, so it doesn't need to worry about extra flags on the
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// instructions and is less susceptible to being broken on LLVM updates.
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// CHECK-LABEL: @option_match
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#[no_mangle]
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pub fn option_match(x: Option<i32>) -> u16 {
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// CHECK-NOT: %x = alloca
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// CHECK: %[[OUT:.+]] = alloca [2 x i8]
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// CHECK-NOT: %x = alloca
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// CHECK: %[[DISCR:.+]] = zext i32 %x.0 to i64
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// CHECK: %[[COND:.+]] = trunc nuw i64 %[[DISCR]] to i1
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// CHECK: br i1 %[[COND]], label %[[TRUE:[a-z0-9]+]], label %[[FALSE:[a-z0-9]+]]
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// CHECK: [[TRUE]]:
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// CHECK: store i16 13, ptr %[[OUT]]
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// CHECK: [[FALSE]]:
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// CHECK: store i16 42, ptr %[[OUT]]
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// CHECK: %[[RET:.+]] = load i16, ptr %[[OUT]]
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// CHECK: ret i16 %[[RET]]
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match x {
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Some(_) => 13,
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None => 42,
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}
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}
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// CHECK-LABEL: @result_match
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#[no_mangle]
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pub fn result_match(x: Result<u64, i64>) -> u16 {
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// CHECK-NOT: %x = alloca
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// CHECK: %[[OUT:.+]] = alloca [2 x i8]
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// CHECK-NOT: %x = alloca
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// CHECK: %[[COND:.+]] = trunc nuw i64 %x.0 to i1
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// CHECK: br i1 %[[COND]], label %[[TRUE:[a-z0-9]+]], label %[[FALSE:[a-z0-9]+]]
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// CHECK: [[TRUE]]:
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// CHECK: store i16 13, ptr %[[OUT]]
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// CHECK: [[FALSE]]:
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// CHECK: store i16 42, ptr %[[OUT]]
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// CHECK: %[[RET:.+]] = load i16, ptr %[[OUT]]
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// CHECK: ret i16 %[[RET]]
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match x {
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Err(_) => 13,
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Ok(_) => 42,
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}
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}
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// CHECK-LABEL: @option_bool_match(
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#[no_mangle]
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pub fn option_bool_match(x: Option<bool>) -> char {
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// CHECK: %[[RAW:.+]] = load i8, ptr %x
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// CHECK: %[[IS_NONE:.+]] = icmp eq i8 %[[RAW]], 2
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// CHECK: %[[OPT_DISCR:.+]] = select i1 %[[IS_NONE]], i64 0, i64 1
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// CHECK: %[[OPT_DISCR_T:.+]] = trunc nuw i64 %[[OPT_DISCR]] to i1
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// CHECK: br i1 %[[OPT_DISCR_T]], label %[[BB_SOME:.+]], label %[[BB_NONE:.+]]
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// CHECK: [[BB_SOME]]:
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// CHECK: %[[FIELD:.+]] = load i8, ptr %x
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// CHECK: %[[FIELD_T:.+]] = trunc nuw i8 %[[FIELD]] to i1
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// CHECK: br i1 %[[FIELD_T]]
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match x {
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None => 'n',
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Some(false) => 'f',
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Some(true) => 't',
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}
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}
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use std::cmp::Ordering::{self, *};
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// CHECK-LABEL: @option_ordering_match(
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#[no_mangle]
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pub fn option_ordering_match(x: Option<Ordering>) -> char {
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// CHECK: %[[RAW:.+]] = load i8, ptr %x
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// CHECK: %[[IS_NONE:.+]] = icmp eq i8 %[[RAW]], 2
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// CHECK: %[[OPT_DISCR:.+]] = select i1 %[[IS_NONE]], i64 0, i64 1
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// CHECK: %[[OPT_DISCR_T:.+]] = trunc nuw i64 %[[OPT_DISCR]] to i1
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// CHECK: br i1 %[[OPT_DISCR_T]], label %[[BB_SOME:.+]], label %[[BB_NONE:.+]]
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// CHECK: [[BB_SOME]]:
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// CHECK: %[[FIELD:.+]] = load i8, ptr %x
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// CHECK: switch i8 %[[FIELD]], label %[[UNREACHABLE:.+]] [
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// CHECK-NEXT: i8 -1, label
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// CHECK-NEXT: i8 0, label
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// CHECK-NEXT: i8 1, label
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// CHECK-NEXT: ]
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// CHECK: [[UNREACHABLE]]:
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// CHECK-NEXT: unreachable
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match x {
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None => '?',
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Some(Less) => '<',
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Some(Equal) => '=',
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Some(Greater) => '>',
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}
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}
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// CHECK-LABEL: @option_nonzero_match(
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#[no_mangle]
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pub fn option_nonzero_match(x: Option<std::num::NonZero<u16>>) -> u16 {
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// CHECK: %[[OUT:.+]] = alloca [2 x i8]
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// CHECK: %[[IS_NONE:.+]] = icmp eq i16 %x, 0
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// CHECK: %[[OPT_DISCR:.+]] = select i1 %[[IS_NONE]], i64 0, i64 1
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// CHECK: %[[OPT_DISCR_T:.+]] = trunc nuw i64 %[[OPT_DISCR]] to i1
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// CHECK: br i1 %[[OPT_DISCR_T]], label %[[BB_SOME:.+]], label %[[BB_NONE:.+]]
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// CHECK: [[BB_SOME]]:
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// CHECK: store i16 987, ptr %[[OUT]]
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// CHECK: [[BB_NONE]]:
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// CHECK: store i16 123, ptr %[[OUT]]
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// CHECK: %[[RET:.+]] = load i16, ptr %[[OUT]]
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// CHECK: ret i16 %[[RET]]
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match x {
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None => 123,
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Some(_) => 987,
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}
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}
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