fallback: legalize: G_STRICT

fallback: legalize: G_STRICT_FSQRT s64

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	legalize: G_STRICT_FSQRT s64
Occurrences:	18 in 6 configs, 2 test files
Snippet from:	double-arith-strict.ll @fsqrt_d via llvm-extract
Config:	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind strictfp
define double @fsqrt_d(double %a) #0 {
  %1 = call double @llvm.experimental.constrained.sqrt.f64(double %a, 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.sqrt.f64(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: %1:_(s64) = G_STRICT_FSQRT %0:_ (in function: fsqrt_d)
warning: Instruction selection used fallback path for fsqrt_d

Occurrences (18):

Input	Function	Config
double-arith-strict.ll	fsqrt_d	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d`
double-arith-strict.ll	fsqrt_d	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32`
double-arith-strict.ll	fsqrt_d	`-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation`
double-arith-strict.ll	fsqrt_d	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64d`
double-arith-strict.ll	fsqrt_d	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64`
double-arith-strict.ll	fsqrt_d	`-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation`
double-intrinsics-strict.ll	sqrt_f64	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d`
double-intrinsics-strict.ll	sqrt_f64	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32`
double-intrinsics-strict.ll	sqrt_f64	`-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation`
double-intrinsics-strict.ll	sqrt_f64	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64d`
double-intrinsics-strict.ll	sqrt_f64	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64`
double-intrinsics-strict.ll	sqrt_f64	`-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation`
double-arith-strict.670333a3cb.ll (mutant of double-arith-strict.ll)	fsqrt_d	`-mtriple=riscv64 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64`
double-arith-strict.934bfcbbdb.ll (mutant of double-arith-strict.ll)	fsqrt_d	`-mtriple=riscv32 -verify-machineinstrs -disable-strictnode-mutation`
double-arith-strict.988733cba7.ll (mutant of double-arith-strict.ll)	fsqrt_d	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=lp64d`
double-arith-strict.a504693904.ll (mutant of double-arith-strict.ll)	fsqrt_d	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32d`
double-arith-strict.bbca830485.ll (mutant of double-arith-strict.ll)	fsqrt_d	`-mtriple=riscv32 -mattr=+zdinx -verify-machineinstrs -disable-strictnode-mutation -target-abi=ilp32`
double-arith-strict.de9fbd5d7c.ll (mutant of double-arith-strict.ll)	fsqrt_d	`-mtriple=riscv64 -verify-machineinstrs -disable-strictnode-mutation`

Generated 2026-10-15 08:05 UTC.