| ; RUN: opt -functionattrs -S < %s | FileCheck %s |
| ; RUN: opt -passes=function-attrs -S < %s | FileCheck %s |
| |
| ; This checks for an iterator wraparound bug in FunctionAttrs. The previous |
| ; "incorrect" behavior was inferring readonly for the %x argument in @caller. |
| ; Inferring readonly for %x *is* actually correct, since @va_func is marked |
| ; readonly, but FunctionAttrs was inferring readonly for the wrong reasons (and |
| ; we _need_ the readonly on @va_func to trigger the problematic code path). It |
| ; is possible that in the future FunctionAttrs becomes smart enough to infer |
| ; readonly for %x for the right reasons, and at that point this test will have |
| ; to be marked invalid. |
| |
| declare void @llvm.va_start(i8*) |
| declare void @llvm.va_end(i8*) |
| |
| define void @va_func(i32* readonly %b, ...) readonly nounwind { |
| ; CHECK-LABEL: define void @va_func(i32* nocapture readonly %b, ...) |
| entry: |
| %valist = alloca i8 |
| call void @llvm.va_start(i8* %valist) |
| call void @llvm.va_end(i8* %valist) |
| %x = call i32 @caller(i32* %b) |
| ret void |
| } |
| |
| define i32 @caller(i32* %x) { |
| ; CHECK-LABEL: define i32 @caller(i32* nocapture %x) |
| entry: |
| call void(i32*,...) @va_func(i32* null, i32 0, i32 0, i32 0, i32* %x) |
| ret i32 42 |
| } |
