fallback: select: G_LOAD s32,p0,s16

Run:	explore-04ca53e65f-20261014-114124
Kind:	fallback
Category:	select: G_LOAD s32,p0,s16
Occurrences:	19 in 12 configs, 5 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 04ca53e65f
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 (19):

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-arith.ab72b9afc6.ll (mutant of double-arith.ll)	fneg_d	`-mtriple=riscv64 -mattr=+d -verify-machineinstrs -target-abi=lp64d`
double-arith.c8ec8b1374.ll (mutant of double-arith.ll)	fneg_d	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs -target-abi=ilp32d`
float-arith.a577ebaec4.ll (mutant of float-arith.ll)	fneg_s	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -target-abi=lp64f`
float-arith.f0009489f2.ll (mutant of float-arith.ll)	fneg_s	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -target-abi=ilp32f`
fp16-promote.7677e6cff7.ll (mutant of fp16-promote.ll)	test_fpextend_float	`-mtriple=riscv32 -mattr +d -target-abi ilp32d`
fpclamptosat.0a29402cf9.ll (mutant of fpclamptosat.ll)	stest_f16i32	`-mtriple=riscv64 -mattr=+f,+d -verify-machineinstrs -target-abi=lp64d`
fpclamptosat.224a84d66a.ll (mutant of fpclamptosat.ll)	utesth_f16i16_mm	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -target-abi=ilp32f`
fpclamptosat.243234fd21.ll (mutant of fpclamptosat.ll)	stest_f16i32	`-mtriple=riscv32 -mattr=+f -verify-machineinstrs -target-abi=ilp32f`
fpclamptosat.4782eb98e6.ll (mutant of fpclamptosat.ll)	stest_f16i32	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -target-abi=lp64f`
fpclamptosat.9691e08350.ll (mutant of fpclamptosat.ll)	utesth_f16i16_mm	`-mtriple=riscv64 -mattr=+f,+d -verify-machineinstrs -target-abi=lp64d`
fpclamptosat.b928c318cf.ll (mutant of fpclamptosat.ll)	utesth_f16i16_mm	`-mtriple=riscv64 -mattr=+f -verify-machineinstrs -target-abi=lp64f`
fpclamptosat.fb87fbdaa7.ll (mutant of fpclamptosat.ll)	utesth_f16i16_mm	`-mtriple=riscv32 -mattr=+f,+d -verify-machineinstrs -target-abi=ilp32d`
vararg.26ed983401.ll (mutant of vararg.ll)	va1	`-mtriple=riscv32 -mattr=+d -target-abi ilp32f -verify-machineinstrs`
vararg.a0b3cc9df1.ll (mutant of vararg.ll)	va1	`-mtriple=riscv64 -mattr=+d -target-abi lp64f -verify-machineinstrs`
vararg.abe9a2e801.ll (mutant of vararg.ll)	va1	`-mtriple=riscv32 -mattr=+d -target-abi ilp32d -verify-machineinstrs`
vararg.ed753317d4.ll (mutant of vararg.ll)	va1	`-mtriple=riscv64 -mattr=+d -target-abi lp64d -verify-machineinstrs`
vararg.fbe942dce5.ll (mutant of vararg.ll)	va1	`-mtriple=riscv32 -mattr=+d -verify-machineinstrs`

Generated 2026-10-15 08:05 UTC.