fallback: select: G_STORE s64,p0,s32

Run:	main-04ca53e65f-20261014-113325
Kind:	fallback
Category:	select: G_STORE s64,p0,s32 NEW
Occurrences:	1 in 1 configs, 1 test files
Snippet from:	float-bit-preserving-dagcombines.3420fcaf8f.ll (mutant of float-bit-preserving-dagcombines.ll) @bitcast_double_or via llvm-extract
Config:	`-mtriple=riscv64 -mattr=+f,+d -target-abi=lp64 -verify-machineinstrs`
Local check:	reproduces at 04ca53e65f
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

@G = external global i64

; Function Attrs: nounwind
define double @bitcast_double_or(double %a1, double %a2) #0 {
  %a3 = fmul double %a1, %a2
  %bc1 = bitcast double %a3 to i64
  %and = or i64 %bc1, -9223372036854775808
  %bc2 = bitcast i64 %and to double
  %a4 = fmul double %a1, %bc2
  store i64 %bc1, ptr @G, align 4
  ret double %a4
}

attributes #0 = { nounwind }

Reproduce:

llc -mtriple=riscv64 -mattr=+f,+d -target-abi=lp64 -verify-machineinstrs -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv64 -mattr=+f,+d -target-abi=lp64 -verify-machineinstrs -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: cannot select: G_STORE %7:fprb(s64), %6:gpr(p0) :: (store (s32) into @G) (in function: bitcast_double_or)
warning: Instruction selection used fallback path for bitcast_double_or

Occurrences (1):

Input	Function	Config
float-bit-preserving-dagcombines.3420fcaf8f.ll (mutant of float-bit-preserving-dagcombines.ll)	bitcast_double_or	`-mtriple=riscv64 -mattr=+f,+d -target-abi=lp64 -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.