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48 lines
1.6 KiB
Rust
48 lines
1.6 KiB
Rust
//@ revisions: DEBUG OPTIM
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//@ [DEBUG] compile-flags: -C opt-level=0
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//@ [OPTIM] compile-flags: -C opt-level=3
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//@ compile-flags: -C no-prepopulate-passes
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#![crate_type = "lib"]
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#![feature(core_intrinsics)]
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use std::intrinsics::three_way_compare;
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#[no_mangle]
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// CHECK-LABEL: @signed_cmp
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// DEBUG-SAME: (i16 %a, i16 %b)
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// OPTIM-SAME: (i16 noundef %a, i16 noundef %b)
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pub fn signed_cmp(a: i16, b: i16) -> std::cmp::Ordering {
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// DEBUG: %[[GT:.+]] = icmp sgt i16 %a, %b
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// DEBUG: %[[ZGT:.+]] = zext i1 %[[GT]] to i8
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// DEBUG: %[[LT:.+]] = icmp slt i16 %a, %b
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// DEBUG: %[[ZLT:.+]] = zext i1 %[[LT]] to i8
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// DEBUG: %[[R:.+]] = sub nsw i8 %[[ZGT]], %[[ZLT]]
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// OPTIM: %[[LT:.+]] = icmp slt i16 %a, %b
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// OPTIM: %[[NE:.+]] = icmp ne i16 %a, %b
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// OPTIM: %[[CGE:.+]] = select i1 %[[NE]], i8 1, i8 0
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// OPTIM: %[[CGEL:.+]] = select i1 %[[LT]], i8 -1, i8 %[[CGE]]
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// OPTIM: ret i8 %[[CGEL]]
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three_way_compare(a, b)
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}
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#[no_mangle]
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// CHECK-LABEL: @unsigned_cmp
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// DEBUG-SAME: (i16 %a, i16 %b)
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// OPTIM-SAME: (i16 noundef %a, i16 noundef %b)
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pub fn unsigned_cmp(a: u16, b: u16) -> std::cmp::Ordering {
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// DEBUG: %[[GT:.+]] = icmp ugt i16 %a, %b
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// DEBUG: %[[ZGT:.+]] = zext i1 %[[GT]] to i8
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// DEBUG: %[[LT:.+]] = icmp ult i16 %a, %b
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// DEBUG: %[[ZLT:.+]] = zext i1 %[[LT]] to i8
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// DEBUG: %[[R:.+]] = sub nsw i8 %[[ZGT]], %[[ZLT]]
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// OPTIM: %[[LT:.+]] = icmp ult i16 %a, %b
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// OPTIM: %[[NE:.+]] = icmp ne i16 %a, %b
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// OPTIM: %[[CGE:.+]] = select i1 %[[NE]], i8 1, i8 0
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// OPTIM: %[[CGEL:.+]] = select i1 %[[LT]], i8 -1, i8 %[[CGE]]
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// OPTIM: ret i8 %[[CGEL]]
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three_way_compare(a, b)
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}
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