https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90255
Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |ramana.radhakrishnan at arm
dot co
| |m, vmakarov at redhat dot com,
| |wdijkstr at arm dot com
--- Comment #1 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
[committed too early]
It looks like a 64-bit constant 0 is held over a function call when the code
could just initialize the registers directly.
Code before commit:
main:
@ Function supports interworking.
@ args = 0, pretend = 0, frame = 24
@ frame_needed = 0, uses_anonymous_args = 0
push {r4, r5, r6, r7, r8, r9, r10, lr} // 8 registers saved.
ldr r3, [r1]
ldr r5, .L14
cmp r0, #4
mov r4, r1
str r3, [r5]
sub sp, sp, #48 // 48 bytes stack space
blne usage
.L2:
ldmib r4, {r6, r8}
ldr r1, .L14+4
mov r0, r6
add r2, sp, #28
ldr r7, [r4, #12]
bl sscanf
cmp r0, #1
beq .L3
ldr r3, .L14+8
ldr r0, [r3]
mov r3, r6
ldr r2, [r5]
ldr r1, .L14+12
.L12:
ldr r0, [r0, #8]
bl fprintf
mov r0, #1
.L13:
bl exit
.L3:
mov r0, r8
ldr r1, .L14+16
add r2, sp, #44
bl sscanf
cmp r0, #1
beq .L4
ldr r3, .L14+8
ldr r2, [r5]
ldr r0, [r3]
ldr r1, .L14+20
mov r3, r8
b .L12
.L4:
mov r0, r7
ldr r1, .L14+24
bl fopen
subs r4, r0, #0
bne .L5
ldr r3, .L14+8
ldr r2, [r5]
ldr r0, [r3]
ldr r1, .L14+28
mov r3, r7
b .L12
.L5:
mov r1, r4
ldr r0, .L14+32
bl fputs
mov r5, #0
mov r8, #1065353216
ldr r9, .L14+36
.L6:
ldr r10, [sp, #28]
cmp r10, r5
bgt .L7
mov r0, r4
bl fclose
mov r0, #0
b .L13
.L7:
mov r0, r5
bl __aeabi_i2d
mov r6, r0
mov r0, r10
mov r7, r1
bl __aeabi_i2d
mov r2, r0
mov r3, r1
mov r0, r6
mov r1, r7
bl __aeabi_ddiv
mov r2, #0
mov r3, #0
bl __aeabi_dadd
bl __aeabi_d2f
mov r6, r0
mov r3, r0
add r2, sp, #40
add r1, sp, #36
add r0, sp, #32
str r8, [sp, #4] @ float
str r8, [sp] @ float
bl dyeHSVtoRGB
mov r0, r6
bl __aeabi_f2d
ldr r10, [sp, #44] @ float
mov r6, r0
mov r7, r1
mov r0, r10
ldr r1, [sp, #40] @ float
bl __aeabi_fmul
bl __aeabi_f2d
str r0, [sp, #16]
str r1, [sp, #20]
ldr r1, [sp, #36] @ float
mov r0, r10
bl __aeabi_fmul
bl __aeabi_f2d
str r0, [sp, #8]
str r1, [sp, #12]
ldr r1, [sp, #32] @ float
mov r0, r10
bl __aeabi_fmul
bl __aeabi_f2d
mov r2, r6
stm sp, {r0-r1}
mov r3, r7
mov r1, r9
mov r0, r4
bl fprintf
add r5, r5, #1
b .L6
after r 266385
main:
@ Function supports interworking.
@ args = 0, pretend = 0, frame = 32
@ frame_needed = 0, uses_anonymous_args = 0
push {r4, r5, r6, r7, r8, r9, r10, fp, lr} // 9 regs saved
ldr r3, [r1]
ldr r5, .L14
cmp r0, #4
mov r4, r1
str r3, [r5]
sub sp, sp, #60 // 60 bytes stack space
blne usage
.L2:
ldmib r4, {r6, r8}
ldr r1, .L14+4
mov r0, r6
add r2, sp, #36
ldr r7, [r4, #12]
bl sscanf
cmp r0, #1
beq .L3
ldr r3, .L14+8
ldr r0, [r3]
mov r3, r6
ldr r2, [r5]
ldr r1, .L14+12
.L12:
ldr r0, [r0, #8]
bl fprintf
mov r0, #1
.L13:
bl exit
.L3:
mov r0, r8
ldr r1, .L14+16
add r2, sp, #52
bl sscanf
cmp r0, #1
beq .L4
ldr r3, .L14+8
ldr r2, [r5]
ldr r0, [r3]
ldr r1, .L14+20
mov r3, r8
b .L12
.L4:
mov r0, r7
ldr r1, .L14+24
bl fopen
subs r4, r0, #0
bne .L5
ldr r3, .L14+8
ldr r2, [r5]
ldr r0, [r3]
ldr r1, .L14+28
mov r3, r7
b .L12
.L5:
mov r1, r4
ldr r0, .L14+32
bl fputs
mov r5, #0
mov r8, #0 // Additional register initialization
mov r9, #0 // Additional register initialization
mov r10, #1065353216
ldr fp, .L14+36
.L6:
ldr r3, [sp, #36]
cmp r3, r5
bgt .L7
mov r0, r4
bl fclose
mov r0, #0
b .L13
.L7:
mov r0, r5
str r3, [sp, #24]
bl __aeabi_i2d
ldr r3, [sp, #24]
mov r6, r0
mov r0, r3
mov r7, r1
bl __aeabi_i2d
mov r2, r0
mov r3, r1
mov r0, r6
mov r1, r7
bl __aeabi_ddiv
mov r2, r8 // r8,r9 are never changed, and always 0, just use
immediate value
mov r3, r9
bl __aeabi_dadd
bl __aeabi_d2f
mov r6, r0
mov r3, r0
add r2, sp, #48
add r1, sp, #44
add r0, sp, #40
str r10, [sp, #4] @ float
str r10, [sp] @ float
bl dyeHSVtoRGB
mov r0, r6
bl __aeabi_f2d
mov r2, r0
mov r3, r1
ldr r7, [sp, #52] @ float
ldr r1, [sp, #48] @ float
mov r0, r7
str r2, [sp, #24]
str r3, [sp, #28]
bl __aeabi_fmul
bl __aeabi_f2d
str r0, [sp, #16]
str r1, [sp, #20]
ldr r1, [sp, #44] @ float
mov r0, r7
bl __aeabi_fmul
bl __aeabi_f2d
str r0, [sp, #8]
str r1, [sp, #12]
ldr r1, [sp, #40] @ float
mov r0, r7
bl __aeabi_fmul
bl __aeabi_f2d
add r3, sp, #24
ldmia r3, {r2-r3}
stm sp, {r0-r1}
mov r1, fp
mov r0, r4
bl fprintf
add r5, r5, #1
b .L6
