fallback: legalize: G_STRICT_FSUB s32
| Run: | explore-04ca53e65f-20261014-114124 |
| Kind: | fallback |
| Category: | legalize: G_STRICT_FSUB s32 |
| Occurrences: | 12 in 6 configs, 1 test files |
| Snippet from: | float-arith-strict.ll @fsub_s via llvm-extract |
| Config: | -mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f |
| Local check: | reproduces at 04ca53e65f |
| Compiler Explorer: | not uploaded (over --godbolt-limit or disabled) |
Snippet:
; Function Attrs: nounwind strictfp
define float @fsub_s(float %a, float %b) #0 {
%1 = call float @llvm.experimental.constrained.fsub.f32(float %a, float %b, metadata !"round.dynamic", metadata !"fpexcept.strict") #2
ret float %1
}
; Function Attrs: nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite)
declare float @llvm.experimental.constrained.fsub.f32(float, float, metadata, metadata) #1
attributes #0 = { nounwind strictfp }
attributes #1 = { nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite) }
attributes #2 = { strictfp }
Reproduce:
llc -mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f -global-isel=0 snippet.ll -o -
Local llc output:
remark: <unknown>:0:0: unable to legalize instruction: %2:_(s32) = G_STRICT_FSUB %0:_, %1:_ (in function: fsub_s)
warning: Instruction selection used fallback path for fsub_s
Occurrences (12):
| Input | Function | Config |
|---|
| float-arith-strict.ll | fsub_s | -mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f |
| float-arith-strict.ll | fsub_s | -mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32 |
| float-arith-strict.ll | fsub_s | -mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation |
| float-arith-strict.ll | fsub_s | -mtriple=riscv64 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64f |
| float-arith-strict.ll | fsub_s | -mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64 |
| float-arith-strict.ll | fsub_s | -mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation |
| float-arith-strict.139fc5b7d0.ll (mutant of float-arith-strict.ll) | fsub_s | -mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation |
| float-arith-strict.5a10e43117.ll (mutant of float-arith-strict.ll) | fsub_s | -mtriple=riscv32 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32f |
| float-arith-strict.66ad11d911.ll (mutant of float-arith-strict.ll) | fsub_s | -mtriple=riscv64 -mattr=+f -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64f |
| float-arith-strict.7dc6d38c08.ll (mutant of float-arith-strict.ll) | fsub_s | -mtriple=riscv32 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32 |
| float-arith-strict.d8e5a0a468.ll (mutant of float-arith-strict.ll) | fsub_s | -mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation |
| float-arith-strict.ebd4dada8e.ll (mutant of float-arith-strict.ll) | fsub_s | -mtriple=riscv64 -mattr=+zfinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64 |
Generated 2026-10-15 08:05 UTC.