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e70cf014b8
llvm/llvm-project#87910 infers `nuw` and `nsw` on some `trunc` instructions we're doing `FileCheck` on. Tolerate but don't require them to support both release and head LLVM.
114 lines
3.6 KiB
Rust
114 lines
3.6 KiB
Rust
//@ compile-flags: -O
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#![crate_type = "lib"]
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#![feature(unchecked_shifts)]
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#![feature(core_intrinsics)]
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// CHECK-LABEL: @unchecked_shl_unsigned_same
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#[no_mangle]
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pub unsafe fn unchecked_shl_unsigned_same(a: u32, b: u32) -> u32 {
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// CHECK-NOT: assume
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// CHECK-NOT: and i32
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// CHECK: shl i32 %a, %b
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// CHECK-NOT: and i32
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a.unchecked_shl(b)
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}
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// CHECK-LABEL: @unchecked_shl_unsigned_smaller
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#[no_mangle]
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pub unsafe fn unchecked_shl_unsigned_smaller(a: u16, b: u32) -> u16 {
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// This uses -DAG to avoid failing on irrelevant reorderings,
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// like emitting the truncation earlier.
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// CHECK-DAG: %[[INRANGE:.+]] = icmp ult i32 %b, 16
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// CHECK-DAG: tail call void @llvm.assume(i1 %[[INRANGE]])
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// CHECK-DAG: %[[TRUNC:.+]] = trunc{{( nuw)?( nsw)?}} i32 %b to i16
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// CHECK-DAG: shl i16 %a, %[[TRUNC]]
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a.unchecked_shl(b)
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}
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// CHECK-LABEL: @unchecked_shl_unsigned_bigger
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#[no_mangle]
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pub unsafe fn unchecked_shl_unsigned_bigger(a: u64, b: u32) -> u64 {
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// CHECK-NOT: assume
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// CHECK: %[[EXT:.+]] = zext{{( nneg)?}} i32 %b to i64
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// CHECK: shl i64 %a, %[[EXT]]
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a.unchecked_shl(b)
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}
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// CHECK-LABEL: @unchecked_shr_signed_same
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#[no_mangle]
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pub unsafe fn unchecked_shr_signed_same(a: i32, b: u32) -> i32 {
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// CHECK-NOT: assume
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// CHECK-NOT: and i32
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// CHECK: ashr i32 %a, %b
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// CHECK-NOT: and i32
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a.unchecked_shr(b)
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}
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// CHECK-LABEL: @unchecked_shr_signed_smaller
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#[no_mangle]
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pub unsafe fn unchecked_shr_signed_smaller(a: i16, b: u32) -> i16 {
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// This uses -DAG to avoid failing on irrelevant reorderings,
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// like emitting the truncation earlier.
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// CHECK-DAG: %[[INRANGE:.+]] = icmp ult i32 %b, 16
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// CHECK-DAG: tail call void @llvm.assume(i1 %[[INRANGE]])
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// CHECK-DAG: %[[TRUNC:.+]] = trunc{{( nuw)?( nsw)?}} i32 %b to i16
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// CHECK-DAG: ashr i16 %a, %[[TRUNC]]
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a.unchecked_shr(b)
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}
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// CHECK-LABEL: @unchecked_shr_signed_bigger
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#[no_mangle]
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pub unsafe fn unchecked_shr_signed_bigger(a: i64, b: u32) -> i64 {
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// CHECK-NOT: assume
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// CHECK: %[[EXT:.+]] = zext{{( nneg)?}} i32 %b to i64
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// CHECK: ashr i64 %a, %[[EXT]]
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a.unchecked_shr(b)
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}
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// CHECK-LABEL: @unchecked_shr_u128_i8
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#[no_mangle]
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pub unsafe fn unchecked_shr_u128_i8(a: u128, b: i8) -> u128 {
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// CHECK-NOT: assume
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// CHECK: %[[EXT:.+]] = zext{{( nneg)?}} i8 %b to i128
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// CHECK: lshr i128 %a, %[[EXT]]
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std::intrinsics::unchecked_shr(a, b)
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}
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// CHECK-LABEL: @unchecked_shl_i128_u8
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#[no_mangle]
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pub unsafe fn unchecked_shl_i128_u8(a: i128, b: u8) -> i128 {
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// CHECK-NOT: assume
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// CHECK: %[[EXT:.+]] = zext{{( nneg)?}} i8 %b to i128
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// CHECK: shl i128 %a, %[[EXT]]
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std::intrinsics::unchecked_shl(a, b)
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}
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// CHECK-LABEL: @unchecked_shl_u8_i128
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#[no_mangle]
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pub unsafe fn unchecked_shl_u8_i128(a: u8, b: i128) -> u8 {
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// This uses -DAG to avoid failing on irrelevant reorderings,
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// like emitting the truncation earlier.
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// CHECK-DAG: %[[INRANGE:.+]] = icmp ult i128 %b, 8
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// CHECK-DAG: tail call void @llvm.assume(i1 %[[INRANGE]])
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// CHECK-DAG: %[[TRUNC:.+]] = trunc{{( nuw)?( nsw)?}} i128 %b to i8
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// CHECK-DAG: shl i8 %a, %[[TRUNC]]
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std::intrinsics::unchecked_shl(a, b)
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}
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// CHECK-LABEL: @unchecked_shr_i8_u128
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#[no_mangle]
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pub unsafe fn unchecked_shr_i8_u128(a: i8, b: u128) -> i8 {
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// This uses -DAG to avoid failing on irrelevant reorderings,
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// like emitting the truncation earlier.
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// CHECK-DAG: %[[INRANGE:.+]] = icmp ult i128 %b, 8
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// CHECK-DAG: tail call void @llvm.assume(i1 %[[INRANGE]])
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// CHECK-DAG: %[[TRUNC:.+]] = trunc{{( nuw)?( nsw)?}} i128 %b to i8
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// CHECK-DAG: ashr i8 %a, %[[TRUNC]]
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std::intrinsics::unchecked_shr(a, b)
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}
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