fallback: legalize: G_STRICT

fallback: legalize: G_STRICT_FADD s64

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	legalize: G_STRICT_FADD s64
Occurrences:	17 in 7 configs, 2 test files
Snippet from:	double-arith-strict.ll @fadd_d via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind strictfp
define double @fadd_d(double %a, double %b) #0 {
  %1 = call double @llvm.experimental.constrained.fadd.f64(double %a, double %b, metadata !"round.dynamic", metadata !"fpexcept.strict") #2
  ret double %1
}

; Function Attrs: nocallback nofree nosync nounwind strictfp willreturn memory(inaccessiblemem: readwrite)
declare double @llvm.experimental.constrained.fadd.f64(double, double, 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=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: unable to legalize instruction: %2:_(s64) = G_STRICT_FADD %0:_, %1:_ (in function: fadd_d)
warning: Instruction selection used fallback path for fadd_d

Occurrences (17):

Input	Function	Config
double-arith-strict.ll	fadd_d	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d`
double-arith-strict.ll	fadd_d	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32`
double-arith-strict.ll	fadd_d	`-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation`
double-arith-strict.ll	fadd_d	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64d`
double-arith-strict.ll	fadd_d	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64`
double-arith-strict.ll	fadd_d	`-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation`
frm-write-in-loop.ll	foo	`-O3 -mtriple=riscv64 -mattr=+f,+d`
frm-write-in-loop.ll	foo2	`-O3 -mtriple=riscv64 -mattr=+f,+d`
double-arith-strict.00b80d8678.ll (mutant of double-arith-strict.ll)	fadd_d	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32`
double-arith-strict.1e96969c65.ll (mutant of double-arith-strict.ll)	fadd_d	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d`
double-arith-strict.a2f0d9d520.ll (mutant of double-arith-strict.ll)	fadd_d	`-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation`
double-arith-strict.bef89cfe3e.ll (mutant of double-arith-strict.ll)	fadd_d	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64`
double-arith-strict.c4d30aec6e.ll (mutant of double-arith-strict.ll)	fadd_d	`-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation`
double-arith-strict.ffe4a60fe5.ll (mutant of double-arith-strict.ll)	fadd_d	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64d`
frm-write-in-loop.1cc1893eb3.ll (mutant of frm-write-in-loop.ll)	foo	`-O3 -mtriple=riscv64 -mattr=+f,+d`
frm-write-in-loop.e073736a4f.ll (mutant of frm-write-in-loop.ll)	foo	`-O3 -mtriple=riscv64 -mattr=+f,+d`
frm-write-in-loop.e073736a4f.ll (mutant of frm-write-in-loop.ll)	foo2	`-O3 -mtriple=riscv64 -mattr=+f,+d`

Generated 2026-10-15 08:05 UTC.