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Type:
Bug
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Resolution: Fixed
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Priority:
Medium
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Code Generation Tools
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CODEGEN-16050
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C7000_6.2.0.LTS
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default
Compiler may generate invalid assembly for load or store instruction in loop with a missing functional unit.
So far we have only seen this occur when accessing/changing function parameters in a loop in a variable-argument function. But in theory it may occur in other places.
If/When this bug occurs, the compiler will "successfully" produce assembly, but the assembler will throw an error "Invalid Instruction".
Below is snippets of some example code that causes the problem.
int my_sscanf(const char *s, char *f, ...) { va_list ap; int nvars = ...; ... va_start(ap, f); while (*f) { ... while (!(*s == 0 || !isspace(*s))) { s++; } switch (*f) { case '%': { ... break; } } } va_end(ap); return nvars; }
When this code is compiled you may get an error like this:
"/tmp/TIL6IowOqQr", ERROR! at line 454: [E0003] Invalid instruction [ A1] STD B0,*SP(304) ; [] |35| "/tmp/TIL6IowOqQr", REMARK at line 454: [R0001] After symbol substitution the line became: [ A1] STD B0,*D15(304) ; [] |35| 1 Assembly Error, No Assembly Warnings Errors in Source - Assembler Aborted >> Compilation failure
You can know if your code is affected by this bug by whether it fails to build. If the compiler succeeds to make an object file with your code, your code is not affected by this bug.
