fallback: legalize: G_ATOMIC_CMPXCHG s64,p0
| Run: | explore-bc8218b282-20261015-075519 |
| Kind: | fallback |
| Category: | legalize: G_ATOMIC_CMPXCHG s64,p0 |
| Occurrences: | 12 in 2 configs, 1 test files |
| Snippet from: | forced-atomics.ll @rmw64_fadd_seq_cst via llvm-extract |
| Config: | -mtriple=riscv64 -mattr=+forced-atomics |
| Local check: | reproduces at bc8218b282 |
| Compiler Explorer: | not uploaded (over --godbolt-limit or disabled) |
Snippet:
; Function Attrs: nounwind
define double @rmw64_fadd_seq_cst(ptr %p) #0 {
%v = atomicrmw fadd ptr %p, double 1.000000e+00 seq_cst, align 8
ret double %v
}
attributes #0 = { nounwind }
Reproduce:
llc -mtriple=riscv64 -mattr=+forced-atomics -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+forced-atomics -global-isel=0 snippet.ll -o -
Local llc output:
remark: <unknown>:0:0: unable to legalize instruction: %14:_(s64) = G_ATOMIC_CMPXCHG %0:_(p0), %2:_, %4:_ :: (load store seq_cst seq_cst (s64) on %ir.p) (in function: rmw64_fadd_seq_cst)
warning: Instruction selection used fallback path for rmw64_fadd_seq_cst
Occurrences (12):
| Input | Function | Config |
|---|
| forced-atomics.ll | rmw64_fadd_seq_cst | -mtriple=riscv64 -mattr=+forced-atomics |
| forced-atomics.ll | rmw64_fsub_seq_cst | -mtriple=riscv64 -mattr=+forced-atomics |
| forced-atomics.ll | rmw64_fmin_seq_cst | -mtriple=riscv64 -mattr=+forced-atomics |
| forced-atomics.ll | rmw64_fmax_seq_cst | -mtriple=riscv64 -mattr=+forced-atomics |
| forced-atomics.ll | cmpxchg64_monotonic | -mtriple=riscv64 -mattr=+forced-atomics |
| forced-atomics.ll | cmpxchg64_seq_cst | -mtriple=riscv64 -mattr=+forced-atomics |
| forced-atomics.ll | rmw64_fadd_seq_cst | -mtriple=riscv64 -mattr=+forced-atomics,+no-trailing-seq-cst-fence |
| forced-atomics.ll | rmw64_fsub_seq_cst | -mtriple=riscv64 -mattr=+forced-atomics,+no-trailing-seq-cst-fence |
| forced-atomics.ll | rmw64_fmin_seq_cst | -mtriple=riscv64 -mattr=+forced-atomics,+no-trailing-seq-cst-fence |
| forced-atomics.ll | rmw64_fmax_seq_cst | -mtriple=riscv64 -mattr=+forced-atomics,+no-trailing-seq-cst-fence |
| forced-atomics.ll | cmpxchg64_monotonic | -mtriple=riscv64 -mattr=+forced-atomics,+no-trailing-seq-cst-fence |
| forced-atomics.ll | cmpxchg64_seq_cst | -mtriple=riscv64 -mattr=+forced-atomics,+no-trailing-seq-cst-fence |
Generated 2026-10-15 08:05 UTC.