[EXT_EP-9596] Compiler intermittently fails with INTERNAL ERROR: optimizer experienced a segmentation fault Created: 18/Dec/19 Updated: 11/May/20 Resolved: 18/Dec/19 |
|
| Status: | Fixed |
| Project: | Embedded Software & Tools |
| Component/s: | None |
| Affects Version/s: | None |
| Fix Version/s: | None |
| Type: | Bug | Priority: | Medium |
| Reporter: | TI User | Assignee: | TI User |
| Resolution: | Fixed | Votes: | 0 |
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Product: | Code Generation Tools |
| Internal ID: | CODEGEN-7011 |
| Forum URL: | https://e2e.ti.com/support/tools/ccs/f/81/t/866937 |
| Found In Release: | C6000_8.2.0 C2000_18.1.0.LTS C6000_8.3.0 MSP430_20.2.0.LTS C7000_1.4.0.LTS* ARM_18.12.0.LTS PRU_2.3.0 ARM_20.2.0.LTS C2000_20.2.0.LTS ARM_18.1.0.LTS MSP430_18.1.0.LTS PRU_2.4.0* MSP430_18.12.0.LTS C2000_18.12.0.LTS |
| Fix In Release: | ARM_18.12.5.LTS MSP430_20.2.0.LTS MSP430_18.1.8.LTS ARM_20.2.0.LTS C2000_20.2.0.LTS MSP430_18.12.5.LTS C2000_18.12.5.LTS PRU_2.4.0* ARM_18.1.8.LTS C2000_18.1.8.LTS C6000_8.3.6 PRU_2.3.4* C6000_8.2.9 |
| Affected Platform/Device: | default |
| Workaround: | Compile at -o1 or less; the pass with the bug runs only at -o2 or greater. In this particular case, making m_register_address a regular field instead of a bitfield will also avoid the issue. There isn't a simple change to the source that might avoid it in the general case; avoidance requires that several aspects that combine for the error, don't combine. |
| Release Notes: | If a struct contains a bitfield, and a function contains both a read and a write of that bitfield, and the expression written includes an operation (such as '&' with a constant) that truncates the value in the same way that the bitfield write does, then the optimiser may crash due to a bad memory access.
The important detail is the write to the bitfield. Note that field writes in C++ don't look struct accesses, but are. Also note that the compiler can inline calls and rearrange code to create the problematic situation in ways that are not obvious. |
| Description |
|
Compiler intermittently fails with INTERNAL ERROR: opt2000 experienced a segmentation fault |