[EXT_EP-10056] Rounding error in floating point division of constant values Created: 23/Sep/20 Updated: 16/Nov/23 |
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| Status: | Accepted |
| Project: | Embedded Software & Tools |
| Component/s: | None |
| Affects Version/s: | None |
| Fix Version/s: | None |
| Type: | Bug | Priority: | Low |
| Reporter: | TI User | Assignee: | TI User |
| Resolution: | Unresolved | Votes: | 0 |
| Remaining Estimate: | Not Specified | ||
| Time Spent: | Not Specified | ||
| Original Estimate: | Not Specified | ||
| Product: | Code Generation Tools |
| Internal ID: | CODEGEN-8214 |
| Forum URL: | https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/942961 |
| Found In Release: | C2000_22.6.0.LTS C2000_21.6.0.LTS C2000_20.2.2.LTS |
| Affected Platform/Device: | default |
| Description |
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The attached file contains this line ... if (delay >= ( (unsigned short) (20e-3/(1e-3)) ) ) Thus, you would expect the variable delay to be compared with the value 20. Build it ... % cl2000 -s try1.c Then inspect the resulting assembly file to see these lines ... ;----------------------------------------------------------------------
; 5 | if (delay >= ( (unsigned short) (20e-3/(1e-3)) ) )
;----------------------------------------------------------------------
MOVW DP,#_delay ; [CPU_ARAU]
MOV AL,@_delay ; [CPU_ALU] |5|
CMPB AL,#19 ; [CPU_ALU] |5|
B $C$L1,LO ; [CPU_ALU] |5|
It is not compared again 20, but 19.
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