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Hi @kubo39 ,
After reading ( using the translator) your notes about fpu, I have run a few tests on it.
Using zig toolchain for esp32-s3
$> ls ~/.espressif/tools/xtensa-esp-elf/esp-13.2.0_20230928/xtensa-esp-elf/lib/gcc/xtensa-esp-elf/13.2.0/esp32s3
crtbegin.o crtend.o crti.o crtn.o libgcc.a libgcov.a no-rtti
$> ./zig-x86_64-relsafe-espressif-linux-musl-baseline/zig build-exe -target xtensa-freestanding-none -mcpu=esp32s3 sqrt_start.zig -fno-compiler-rt $HOME/.espressif/tools/xtensa-esp-elf/esp-13.2.0_20230928/xtensa-esp-elf/lib/gcc/xtensa-esp-elf/13.2.0/esp32s3/libgcc.a $HOME/.espressif/tools/xtensa-esp-elf/esp-13.2.0_20230928/xtensa-esp-elf/lib/gcc/xtensa-esp-elf/13.2.0/esp32s3/crt*
$> xtensa-esp32s3-elf-nm sqrt_start | grep sqrt
00011338 t __ieee754_sqrtf
$> xtensa-esp32s3-elf-readelf -a ../sqrt_start | grep sqrt
19: 00000000 0 FILE LOCAL DEFAULT ABS sqrt
31: 00011338 0 FUNC LOCAL HIDDEN 6 __ieee754_sqrtfSource
extern fn __ieee754_sqrtf(a0: f32) f32;
pub export fn _start() void {
const c = @cImport({
@cDefine("XCHAL_HAVE_FP_SQRT", "1");
});
_ = c;
const value = @import("std").math.sqrt(5.0);
const cvalue = __ieee754_sqrtf(5.0);
@import("std").debug.assert(value == cvalue);
}00011344 <_start>:
11344: 006136 entry a1, 48
11347: 017d mov.n a7, a1
11349: ffc5a1 l32r a10, 11260 <__EH_FRAME_BEGIN__+0x104c>
1134c: ffc681 l32r a8, 11264 <__EH_FRAME_BEGIN__+0x1050>
1134f: 0008e0 callx8 a8
11352: fa8a50 wfr f8, a10
11355: 27a9 s32i.n a10, a7, 8
11357: ffc481 l32r a8, 11268 <__EH_FRAME_BEGIN__+0x1054>
1135a: fa9850 wfr f9, a8
1135d: 080c movi.n a8, 0
1135f: 0789 s32i.n a8, a7, 0
11361: 180c movi.n a8, 1
11363: 2b0890 oeq.s b0, f8, f9
11366: 1789 s32i.n a8, a7, 4
11368: 031076 bt b0, 1136f <_start+0x2b>
1136b: 0788 l32i.n a8, a7, 0
1136d: 1789 s32i.n a8, a7, 4
1136f: 17a8 l32i.n a10, a7, 4
11371: ffbe81 l32r a8, 1126c <__EH_FRAME_BEGIN__+0x1058>
11374: 0008e0 callx8 a8
11377: f01d retw.n
11379: 0020f0 nop__ieee754_sqrtf - asm/objdump
00011338 <__ieee754_sqrtf>:
11338: 002136 entry a1, 16
1133b: fa1250 wfr f1, a2
1133e: fa2190 sqrt0.s f2, f1
11341: fa3030 const.s f3, 0
11344: 6a3220 maddn.s f3, f2, f2
11347: fa41b0 nexp01.s f4, f1
1134a: fa0330 const.s f0, 3
1134d: fa40e0 addexp.s f4, f0
11350: 6a0340 maddn.s f0, f3, f4
11353: fa31b0 nexp01.s f3, f1
11356: fa5360 neg.s f5, f3
11359: 6a2020 maddn.s f2, f0, f2
1135c: fa0030 const.s f0, 0
1135f: fa6030 const.s f6, 0
11362: fa7030 const.s f7, 0
11365: 6a0520 maddn.s f0, f5, f2
11368: 6a6240 maddn.s f6, f2, f4
1136b: fa4330 const.s f4, 3
1136e: 6a7420 maddn.s f7, f4, f2
11371: 6a3000 maddn.s f3, f0, f0
11374: 6a4620 maddn.s f4, f6, f2
11377: fa2760 neg.s f2, f7
1137a: 6a0320 maddn.s f0, f3, f2
1137d: 6a7470 maddn.s f7, f4, f7
11380: fa21c0 mksadj.s f2, f1
11383: fa11b0 nexp01.s f1, f1
11386: 6a1000 maddn.s f1, f0, f0
11389: fa3760 neg.s f3, f7
1138c: fa02f0 addexpm.s f0, f2
1138f: fa32e0 addexp.s f3, f2
11392: 7a0130 divn.s f0, f1, f3
11395: fa2040 rfr a2, f0
11398: f01d retw.nIf try build without crt*.o
error: ld.lld: sqrt_start.o:(function _start: .text+0x5): relocation R_XTENSA_SLOT0_OP out of range: 112 is not in [-262141, 18446744073709551612]; references section '.literal'
note: referenced by sqrt_start.zig:46
error: ld.lld: sqrt_start.o:(function _start: .text+0x8): relocation R_XTENSA_SLOT0_OP out of range: 116 is not in [-262141, 18446744073709551612]; references section '.literal'
note: referenced by sqrt_start.zig:46Metadata
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