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runtime: work around a bug in LLVM for .bss zeroing

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See the following bug: https://bugs.llvm.org/show_bug.cgi?id=42881

I think this is a bug in LLVM, but the code in question wasn't the best
code anyway. By fixing this, about 16 bytes of code are saved on ARM
chips (and much more on AVR).
This commit is contained in:
Ayke van Laethem
2019-08-04 15:32:33 +02:00
committed by Ron Evans
parent 9846c062b3
commit a04db67ea9
3 changed files with 24 additions and 24 deletions
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src/runtime/runtime_avr.go
+4 -4
View File
@@ -47,10 +47,10 @@ func main() {
func preinit() {
// Initialize .bss: zero-initialized global variables.
ptr := uintptr(unsafe.Pointer(&_sbss))
for ptr != uintptr(unsafe.Pointer(&_ebss)) {
*(*uint8)(unsafe.Pointer(ptr)) = 0
ptr += 1
ptr := unsafe.Pointer(&_sbss)
for ptr != unsafe.Pointer(&_ebss) {
*(*uint32)(ptr) = 0
ptr = unsafe.Pointer(uintptr(ptr) + 4)
}
}
src/runtime/runtime_cortexm.go
+10 -10
View File
@@ -24,19 +24,19 @@ var _edata unsafe.Pointer
func preinit() {
// Initialize .bss: zero-initialized global variables.
ptr := uintptr(unsafe.Pointer(&_sbss))
for ptr != uintptr(unsafe.Pointer(&_ebss)) {
*(*uint32)(unsafe.Pointer(ptr)) = 0
ptr += 4
ptr := unsafe.Pointer(&_sbss)
for ptr != unsafe.Pointer(&_ebss) {
*(*uint32)(ptr) = 0
ptr = unsafe.Pointer(uintptr(ptr) + 4)
}
// Initialize .data: global variables initialized from flash.
src := uintptr(unsafe.Pointer(&_sidata))
dst := uintptr(unsafe.Pointer(&_sdata))
for dst != uintptr(unsafe.Pointer(&_edata)) {
*(*uint32)(unsafe.Pointer(dst)) = *(*uint32)(unsafe.Pointer(src))
dst += 4
src += 4
src := unsafe.Pointer(&_sidata)
dst := unsafe.Pointer(&_sdata)
for dst != unsafe.Pointer(&_edata) {
*(*uint32)(dst) = *(*uint32)(src)
dst = unsafe.Pointer(uintptr(dst) + 4)
src = unsafe.Pointer(uintptr(src) + 4)
}
}
src/runtime/runtime_fe310.go
+10 -10
View File
@@ -62,19 +62,19 @@ func pric_init() {
func preinit() {
// Initialize .bss: zero-initialized global variables.
ptr := uintptr(unsafe.Pointer(&_sbss))
for ptr != uintptr(unsafe.Pointer(&_ebss)) {
*(*uint32)(unsafe.Pointer(ptr)) = 0
ptr += 4
ptr := unsafe.Pointer(&_sbss)
for ptr != unsafe.Pointer(&_ebss) {
*(*uint32)(ptr) = 0
ptr = unsafe.Pointer(uintptr(ptr) + 4)
}
// Initialize .data: global variables initialized from flash.
src := uintptr(unsafe.Pointer(&_sidata))
dst := uintptr(unsafe.Pointer(&_sdata))
for dst != uintptr(unsafe.Pointer(&_edata)) {
*(*uint32)(unsafe.Pointer(dst)) = *(*uint32)(unsafe.Pointer(src))
dst += 4
src += 4
src := unsafe.Pointer(&_sidata)
dst := unsafe.Pointer(&_sdata)
for dst != unsafe.Pointer(&_edata) {
*(*uint32)(dst) = *(*uint32)(src)
dst = unsafe.Pointer(uintptr(dst) + 4)
src = unsafe.Pointer(uintptr(src) + 4)
}
}