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rust source #1
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mrustc (master)
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Source code
#[no_mangle] pub fn array_of_tuple_le(a: &[(i16, u16); 2], b: &[(i16, u16); 2]) -> bool { // Ensure that, after all the optimizations have run, the happy path just checks // `eq` on each corresponding pair and moves onto the next one if it is. // Then there's a dedup'd comparison for the place that's different. // (As opposed to, say, running a full `[su]cmp` as part of checking equality.) // This is written quite specifically because different library code was triggering // <https://github.com/llvm/llvm-project/issues/132678> along the way, so this // has enough checks to make sure that's not happening. It doesn't need to be // *exactly* this IR, but be careful if you ever need to update these checks. // CHECK: start: // CHECK: %[[A00:.+]] = load i16, ptr %a // CHECK: %[[B00:.+]] = load i16, ptr %b // CHECK-NOT: cmp // CHECK: %[[EQ00:.+]] = icmp eq i16 %[[A00]], %[[B00]] // CHECK-NEXT: br i1 %[[EQ00]], label %[[L01:.+]], label %[[EXIT_S:.+]] // CHECK: [[L01]]: // CHECK: %[[PA01:.+]] = getelementptr{{.+}}i8, ptr %a, i64 2 // CHECK: %[[PB01:.+]] = getelementptr{{.+}}i8, ptr %b, i64 2 // CHECK: %[[A01:.+]] = load i16, ptr %[[PA01]] // CHECK: %[[B01:.+]] = load i16, ptr %[[PB01]] // CHECK-NOT: cmp // CHECK: %[[EQ01:.+]] = icmp eq i16 %[[A01]], %[[B01]] // CHECK-NEXT: br i1 %[[EQ01]], label %[[L10:.+]], label %[[EXIT_U:.+]] // CHECK: [[L10]]: // CHECK: %[[PA10:.+]] = getelementptr{{.+}}i8, ptr %a, i64 4 // CHECK: %[[PB10:.+]] = getelementptr{{.+}}i8, ptr %b, i64 4 // CHECK: %[[A10:.+]] = load i16, ptr %[[PA10]] // CHECK: %[[B10:.+]] = load i16, ptr %[[PB10]] // CHECK-NOT: cmp // CHECK: %[[EQ10:.+]] = icmp eq i16 %[[A10]], %[[B10]] // CHECK-NEXT: br i1 %[[EQ10]], label %[[L11:.+]], label %[[EXIT_S]] // CHECK: [[L11]]: // CHECK: %[[PA11:.+]] = getelementptr{{.+}}i8, ptr %a, i64 6 // CHECK: %[[PB11:.+]] = getelementptr{{.+}}i8, ptr %b, i64 6 // CHECK: %[[A11:.+]] = load i16, ptr %[[PA11]] // CHECK: %[[B11:.+]] = load i16, ptr %[[PB11]] // CHECK-NOT: cmp // CHECK: %[[EQ11:.+]] = icmp eq i16 %[[A11]], %[[B11]] // CHECK-NEXT: br i1 %[[EQ11]], label %[[DONE:.+]], label %[[EXIT_U]] // CHECK: [[DONE]]: // CHECK: %[[RET:.+]] = phi i1 [ %{{.+}}, %[[EXIT_S]] ], [ %{{.+}}, %[[EXIT_U]] ], [ true, %[[L11]] ] // CHECK: ret i1 %[[RET]] a <= b }
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