https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94548
Bug ID: 94548
Summary: [AVR] Part of the code seems to have disappeared in
the elf
Product: gcc
Version: 9.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: fabrice.salvaire at orange dot fr
Target Milestone: ---
For this code
### unsigned long int
### ml_per_h_to_timer_value(int desired_ml_per_h, int syringe_step_per_ml) {
### unsigned long int timer = 0;
### timer = ((31.2500 * 3600000UL) / ((unsigned long) desired_ml_per_h *
(unsigned long) syringe_step_per_ml));
### #ifdef DEBUG_PROCESS
### Serial.println("********************* TIMER VALUE
*********************");
### Serial.println(timer);
### #endif
### return (timer);
### }
I got
### unsigned long int
### ml_per_h_to_timer_value(int desired_ml_per_h, int syringe_step_per_ml) {
### 9cc: cf 92 push r12
### 9ce: df 92 push r13
### 9d0: ef 92 push r14
### 9d2: ff 92 push r15
### unsigned long int timer = 0;
### timer = ((31.2500 * 3600000UL) / ((unsigned long) desired_ml_per_h *
(unsigned long) syringe_step_per_ml));
### 9d4: 9c 01 movw r18, r24
### 9d6: db 01 movw r26, r22
### 9d8: 0e 94 7f 1d call 0x3afe ; 0x3afe <__mulhisi3>
### 9dc: 0e 94 bb 1c call 0x3976 ; 0x3976 <__floatunsisf>
### 9e0: 9b 01 movw r18, r22
### 9e2: ac 01 movw r20, r24
### 9e4: 64 ea ldi r22, 0xA4 ; 164
### 9e6: 73 e9 ldi r23, 0x93 ; 147
### 9e8: 86 ed ldi r24, 0xD6 ; 214
### 9ea: 9c e4 ldi r25, 0x4C ; 76
### 9ec: 0e 94 1a 1c call 0x3834 ; 0x3834 <__divsf3>
### 9f0: 0e 94 8c 1c call 0x3918 ; 0x3918 <__fixunssfsi>
### 9f4: 6b 01 movw r12, r22
### 9f6: 7c 01 movw r14, r24
### // timer = ((f0 * 3600000UL) / ((unsigned long) desired_ml_per_h *
(unsigned long) syringe_step_per_ml));
### #ifdef DEBUG_PROCESS
### Serial.println("********************* TIMER VALUE
*********************");
### 9f8: 83 ef ldi r24, 0xF3 ; 243
### 9fa: 91 e0 ldi r25, 0x01 ; 1
### 9fc: 0e 94 d3 04 call 0x9a6 ; 0x9a6 <Print::println(char
const*) [clone .constprop.13]>
### else return printNumber(n, base);
### a00: 2a e0 ldi r18, 0x0A ; 10
### a02: b7 01 movw r22, r14
### a04: a6 01 movw r20, r12
### a06: 83 e6 ldi r24, 0x63 ; 99
### a08: 96 e0 ldi r25, 0x06 ; 6
### a0a: 0e 94 5a 04 call 0x8b4 ; 0x8b4
<Print::printNumber(unsigned long, unsigned char)>
### a0e: 60 ef ldi r22, 0xF0 ; 240
### a10: 71 e0 ldi r23, 0x01 ; 1
### a12: 83 e6 ldi r24, 0x63 ; 99
### a14: 96 e0 ldi r25, 0x06 ; 6
### a16: 0e 94 4b 04 call 0x896 ; 0x896 <Print::write(char
const*) [clone .part.2]>
### Serial.println(timer);
### #endif
### return (timer);
### }
### a1a: c7 01 movw r24, r14
### a1c: b6 01 movw r22, r12
### a1e: ff 90 pop r15
### a20: ef 90 pop r14
### a22: df 90 pop r13
### a24: cf 90 pop r12
### a26: 08 95 ret
But
### unsigned long int
### ml_per_h_to_timer_value(int desired_ml_per_h, int syringe_step_per_ml) {
### unsigned long int timer = 0;
### const unsigned long int f0 = (8UL*10^6) / (1000*256UL);
### timer = ((f0 * 3600000UL) / ((unsigned long) desired_ml_per_h *
(unsigned long) syringe_step_per_ml));
### #ifdef DEBUG_PROCESS
### Serial.println("********************* TIMER VALUE
*********************");
### Serial.println(timer);
### #endif
### return (timer);
### }
I got
### 000009cc <ml_per_h_to_timer_value(int, int) [clone .constprop.13]>:
### unsigned long int timer = 0;
### const unsigned long int f0 = (8UL*10^6) / (1000*256UL);
### // timer = ((31.2500 * 3600000UL) / ((unsigned long) desired_ml_per_h *
(unsigned long) syringe_step_per_ml));
### timer = ((f0 * 3600000UL) / ((unsigned long) desired_ml_per_h * (unsigned
long) syringe_step_per_ml));
### #ifdef DEBUG_PROCESS
### Serial.println("********************* TIMER VALUE
*********************");
### 9cc: 83 ef ldi r24, 0xF3 ; 243
### 9ce: 91 e0 ldi r25, 0x01 ; 1
### 9d0: 0e 94 d3 04 call 0x9a6 ; 0x9a6 <Print::println(char
const*) [clone .constprop.14]>
### else return printNumber(n, base);
### 9d4: 2a e0 ldi r18, 0x0A ; 10
### 9d6: 40 e0 ldi r20, 0x00 ; 0
### 9d8: 50 e0 ldi r21, 0x00 ; 0
### 9da: ba 01 movw r22, r20
### 9dc: 83 e6 ldi r24, 0x63 ; 99
### 9de: 96 e0 ldi r25, 0x06 ; 6
### 9e0: 0e 94 5a 04 call 0x8b4 ; 0x8b4
<Print::printNumber(unsigned long, unsigned char)>
### 9e4: 60 ef ldi r22, 0xF0 ; 240
### 9e6: 71 e0 ldi r23, 0x01 ; 1
### 9e8: 83 e6 ldi r24, 0x63 ; 99
### 9ea: 96 e0 ldi r25, 0x06 ; 6
### 9ec: 0e 94 4b 04 call 0x896 ; 0x896 <Print::write(char
const*) [clone .part.2]>
### Serial.println(timer);
### #endif
### return (timer);
### }
### 9f0: 60 e0 ldi r22, 0x00 ; 0
### 9f2: 70 e0 ldi r23, 0x00 ; 0
### 9f4: cb 01 movw r24, r22
### 9f6: 08 95 ret
If I am right this code return 0 and the division is gone.
