The constructs %hi() and %lo() represent the high and low 16
bits of the address.
Because the 16 bit offset field of an LW instruction is
interpreted as signed, if bit 15 of the low part is 1 then the
low part will act as a negative and 1 needs to be added to the
high part.
Contributer: Vladimir Medic
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175707
91177308-0d34-0410-b5e6-
96231b3b80d8
if (Str == "lo") {
Val = Val & 0xffff;
} else if (Str == "hi") {
+ int LoSign = Val & 0x8000;
Val = (Val & 0xffff0000) >> 16;
+ //lower part is treated as signed int, so if it is negative
+ //we must add 1 to hi part to compensate
+ if (LoSign)
+ Val++;
}
Res = MCConstantExpr::Create(Val, getContext());
return false;
--- /dev/null
+# RUN: llvm-mc -show-encoding -triple mips-unknown-unknown %s | FileCheck %s
+
+ .ent hilo_test
+ .equ addr, 0xdeadbeef
+# CHECK: # encoding: [0x3c,0x04,0xde,0xae]
+ lui $4,%hi(addr)
+# CHECK: # encoding: [0x03,0xe0,0x00,0x08]
+ jr $31
+# CHECK: # encoding: [0x80,0x82,0xbe,0xef]
+ lb $2,%lo(addr)($4)
+ .end hilo_test
-# RUN: llvm-mc -triple mips-unknown-unknown %s | FileCheck %s
-#this test produces no output so there isS no FileCheck call
+# RUN: llvm-mc -show-encoding -triple mips-unknown-unknown %s | FileCheck %s
+#
$BB0_2:
.ent directives_test
.frame $sp,0,$ra
.set macro
.set reorder
.set at=$a0
- .end directives_test