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Diffstat (limited to 'src/test/codegen/unchecked_shifts.rs')
-rw-r--r-- | src/test/codegen/unchecked_shifts.rs | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/src/test/codegen/unchecked_shifts.rs b/src/test/codegen/unchecked_shifts.rs new file mode 100644 index 000000000..60d0cb09a --- /dev/null +++ b/src/test/codegen/unchecked_shifts.rs @@ -0,0 +1,66 @@ +// compile-flags: -O +// min-llvm-version: 15.0 (LLVM 13 in CI does this differently from submodule LLVM) +// ignore-debug (because unchecked is checked in debug) + +#![crate_type = "lib"] +#![feature(unchecked_math)] + +// CHECK-LABEL: @unchecked_shl_unsigned_same +#[no_mangle] +pub unsafe fn unchecked_shl_unsigned_same(a: u32, b: u32) -> u32 { + // CHECK-NOT: and i32 + // CHECK: shl i32 %a, %b + // CHECK-NOT: and i32 + a.unchecked_shl(b) +} + +// CHECK-LABEL: @unchecked_shl_unsigned_smaller +#[no_mangle] +pub unsafe fn unchecked_shl_unsigned_smaller(a: u16, b: u32) -> u16 { + // This uses -DAG to avoid failing on irrelevant reorderings, + // like emitting the truncation earlier. + + // CHECK-DAG: %[[INRANGE:.+]] = icmp ult i32 %b, 65536 + // CHECK-DAG: tail call void @llvm.assume(i1 %[[INRANGE]]) + // CHECK-DAG: %[[TRUNC:.+]] = trunc i32 %b to i16 + // CHECK-DAG: shl i16 %a, %[[TRUNC]] + a.unchecked_shl(b) +} + +// CHECK-LABEL: @unchecked_shl_unsigned_bigger +#[no_mangle] +pub unsafe fn unchecked_shl_unsigned_bigger(a: u64, b: u32) -> u64 { + // CHECK: %[[EXT:.+]] = zext i32 %b to i64 + // CHECK: shl i64 %a, %[[EXT]] + a.unchecked_shl(b) +} + +// CHECK-LABEL: @unchecked_shr_signed_same +#[no_mangle] +pub unsafe fn unchecked_shr_signed_same(a: i32, b: u32) -> i32 { + // CHECK-NOT: and i32 + // CHECK: ashr i32 %a, %b + // CHECK-NOT: and i32 + a.unchecked_shr(b) +} + +// CHECK-LABEL: @unchecked_shr_signed_smaller +#[no_mangle] +pub unsafe fn unchecked_shr_signed_smaller(a: i16, b: u32) -> i16 { + // This uses -DAG to avoid failing on irrelevant reorderings, + // like emitting the truncation earlier. + + // CHECK-DAG: %[[INRANGE:.+]] = icmp ult i32 %b, 32768 + // CHECK-DAG: tail call void @llvm.assume(i1 %[[INRANGE]]) + // CHECK-DAG: %[[TRUNC:.+]] = trunc i32 %b to i16 + // CHECK-DAG: ashr i16 %a, %[[TRUNC]] + a.unchecked_shr(b) +} + +// CHECK-LABEL: @unchecked_shr_signed_bigger +#[no_mangle] +pub unsafe fn unchecked_shr_signed_bigger(a: i64, b: u32) -> i64 { + // CHECK: %[[EXT:.+]] = zext i32 %b to i64 + // CHECK: ashr i64 %a, %[[EXT]] + a.unchecked_shr(b) +} |