https://sourceware.org/bugzilla/show_bug.cgi?id=19222
Bug ID: 19222
Summary: Undefined behavoour in tc-arm.c:encode_arm_immediate
with Xcode 7.1
Product: binutils
Version: 2.25
Status: NEW
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: chrisj at rtems dot org
Target Milestone: ---
The function 'encode_arm_immediate' in tc-arm.c does not compile RTEMS 4.11 ARM
GCC on OS X. The error reported is:
../../../../gcc-4.9.3/libgcc/config/arm/ieee754-df.S: Assembler messages:
../../../../gcc-4.9.3/libgcc/config/arm/ieee754-df.S:567: Error: invalid
constant (ff) after fixup
../../../../gcc-4.9.3/libgcc/config/arm/ieee754-df.S:673: Error: invalid
constant (ff) after fixup
../../../../gcc-4.9.3/libgcc/config/arm/ieee754-df.S:689: Error: invalid
constant (fd) after fixup
../../../../gcc-4.9.3/libgcc/config/arm/ieee754-df.S:875: Error: invalid
constant (ff) after fixup
../../../../gcc-4.9.3/libgcc/config/arm/ieee754-df.S:912: Error: invalid
constant (fd) after fixup
../../../../gcc-4.9.3/libgcc/config/arm/ieee754-df.S:985: Error: invalid
constant (fd) after fixup
The error has been reported to Apple and they have have said the error is due
to undefined behaviour in the function. A possible solution is:
@@ -9,7 +9,7 @@ encode_arm_immediate (unsigned int val)
printf("val = %08x\n", val);
for (i = 0; i < 32; i += 2)
- if ((a = (val << i | val >> (32 - i))) <= 0xff)
+ if ((a = (val << i | (i == 0 ? 0:val >> (32 - i)))) <= 0xff)
return a | (i << 7);
return (-1);
--
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