| commit | 3a3732c2527056342051068c3dbaef4e822bd0a6 | [log] [tgz] |
|---|---|---|
| author | egebeysel <beysel@roofline.ai> | Fri Mar 28 01:58:56 2025 +0100 |
| committer | GitHub <noreply@github.com> | Thu Mar 27 20:58:56 2025 -0400 |
| tree | ee37665da4aeae4b694330a5219867b88fe2a835 | |
| parent | cd6e959102888279dc7e75a41ebd75a08ac3f7a5 [diff] |
[mlir][arith] wide integer emulation support for fpto*i ops (#132375) Adding wide integer emulation support for `arith.fpto*i` operations. As the other emulated operations, the upper and lower `N` bits of the `i2N` integer result are emitted separately. For the unsigned case we use the following emulation ```c // example is 64 -> 32 bit emulation, but the implementation is generalized to any 2N -> N case const double TWO_POW_N = (uint_64_t(1) << N); // 2^N, N is the bitwidth of the widest int supported // f is a floating-point value representing the input of the fptoui op. uint32_t hi = (uint32_t)(f / TWO_POW_N); // Truncates the division result uint32_t lo = (uint32_t)(f - hi * TWO_POW_N); // Subtracts to get the lower bits. ``` For the signed case, we defer the emulation of the absolute value to `fptoui` and handle the sign: ``` fptosi(fp) = sign(fp) * fptoui(abs(fp)) ``` The edge cases of `NaNs, +-inf` and overflows/underflows are undefined behaviour and the resulting numbers are the combination of the lower bitwidth UB values. These operations also propagate poison values. Signed-off-by: Ege Beysel <beysel@roofline.ai>
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