fallback: select: G_LOAD s32,p0,s16

Run:	explore-bc8218b282-20261015-075519
Kind:	fallback
Category:	select: G_LOAD s32,p0,s16
Occurrences:	11 in 6 configs, 4 test files
Snippet from:	fp16-promote.ll @test_fpextend_float via llvm-extract
Config:	`-mtriple=riscv32 -mattr +d -target-abi ilp32d`
Local check:	reproduces at bc8218b282
Compiler Explorer:	not uploaded (over --godbolt-limit or disabled)

Snippet:

; Function Attrs: nounwind
define float @test_fpextend_float(ptr %p) #0 {
  %a = load half, ptr %p, align 2
  %r = fpext half %a to float
  ret float %r
}

attributes #0 = { nounwind }

Reproduce:

llc -mtriple=riscv32 -mattr +d -target-abi ilp32d -global-isel -global-isel-abort=2 -pass-remarks-missed=gisel.* snippet.ll -o -
llc -mtriple=riscv32 -mattr +d -target-abi ilp32d -global-isel=0 snippet.ll -o -

Local llc output:

remark: <unknown>:0:0: cannot select: %3:fprb(s32) = G_LOAD %0:gprb(p0) :: (load (s16) from %ir.p) (in function: test_fpextend_float)
warning: Instruction selection used fallback path for test_fpextend_float

Occurrences (11):

Input	Function	Config
fp16-promote.ll	test_fpextend_float	`-mtriple=riscv32 -mattr +d -target-abi ilp32d`
fp16-promote.ll	test_fpextend_double	`-mtriple=riscv32 -mattr +d -target-abi ilp32d`
double-intrinsics.f5789d026d.ll (mutant of double-intrinsics.ll)	lround_i32_f64	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d`
double-intrinsics.fadf1d97e2.ll (mutant of double-intrinsics.ll)	lround_i32_f64	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d`
float-br-fcmp.3c51011ce9.ll (mutant of float-br-fcmp.ll)	br_fcmp_oeq_alt	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -target-abi=ilp32f`
float-br-fcmp.4352c1392d.ll (mutant of float-br-fcmp.ll)	br_fcmp_oeq_alt	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -target-abi=lp64f`
fp16-promote.6848224835.ll (mutant of fp16-promote.ll)	test_fpextend_float	`-mtriple=riscv32 -mattr +d -target-abi ilp32d`
fp16-promote.cb23e9c485.ll (mutant of fp16-promote.ll)	test_fpextend_double	`-mtriple=riscv32 -mattr +d -target-abi ilp32d`
fpclamptosat.c707234159.ll (mutant of fpclamptosat.ll)	ustest_f16i32	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -target-abi=ilp32f`
fpclamptosat.cf2faebbde.ll (mutant of fpclamptosat.ll)	ustest_f16i32	`-mtriple=riscv64 -mattr=+f,+d -verify-machineinstrs -target-abi=lp64d`
fpclamptosat.e8e944938e.ll (mutant of fpclamptosat.ll)	ustest_f16i32	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -target-abi=lp64f`

Generated 2026-10-15 08:05 UTC.