Part Number: TMS320F28075
Tool/software: TI C/C++ Compiler
Hi,
Found a very strange issue with compiler version TI v16.9.5.LTS and compile options:
-v28 -ml -mt --cla_support=cla1 --float_support=fpu32 --tmu_support=tmu0 -O1 --opt_for_speed=3 --fp_mode=relaxed --fp_reassoc=on
The same code is running OK with optimization disabled, but malfunctionning if optimization level set to 1:
Source code:
mfPreRampFreq = fPreRampFreq;
mfPreRampFreqPU = fPreRampFreq / CMotorInterface::GetRatedFrequency();
if (fPreRampFreq * mfPostRampFreq < 0.0f) {
fPreRampFreq = 0.0f;
}
Compile result:
084efe: FE02 ADDB SP, #2
084eff: 761F0338 MOVW DP, #0x338
91 fPreRampFreq = 0.0f;
084f01: E2AF0118 MOV32 R1H, @0x18, UNCF
084f03: 761F0336 MOVW DP, #0x336
134 return mfRatedFrequency;
084f05: E2AF0216 MOV32 R2H, @0x16, UNCF
084f07: 761F0338 MOVW DP, #0x338
88 mfPreRampFreqPU = fPreRampFreq / CMotorInterface::GetRatedFrequency();
084f09: E2740082 DIVF32 R2H, R0H, R2H
87 mfPreRampFreq = fPreRampFreq;
084f0b: E0004812 MPYF32 R1H, R1H, R0H
|| MOV32 @0x12, R0H
96 switch (mState) {
084f0d: 9210 MOV AL, @0x10
91 fPreRampFreq = 0.0f;
084f0e: E8200001 MAXF32 R1H, #0x0
084f10: E6CF0008 MOV32 R0H, R1H, UNCF
As can be seen, R0H is holding the fPreRampFreq, R1H is holding the multiplication result. The problem is that the the multiplication result is assigned to fPreRampFreq which cause the error.
Is that a bug of the compiler? Of Any thing is wrong with my code?
