There are 3 issues:
1. Lack of post regalloc LICM.
-2. Poor sub-regclass support. That leads to inability to promote the 16-bit
- arithmetic op to 32-bit and making use of leal.
-3. LSR unable to reused IV for a different type (i16 vs. i32) even though
+2. LSR unable to reused IV for a different type (i16 vs. i32) even though
the cast would be free.
//===---------------------------------------------------------------------===//
//===---------------------------------------------------------------------===//
-Bad codegen:
-
-char foo(int x) { return x; }
-
-_foo:
- movl 4(%esp), %eax
- shll $24, %eax
- sarl $24, %eax
- ret
-
-SIGN_EXTEND_INREG can be implemented as (sext (trunc)) to take advantage of
-sub-registers.
-
-//===---------------------------------------------------------------------===//
-
Consider this:
typedef struct pair { float A, B; } pair;