[llvm] [RISCV] Use two ADDIs to do some stack pointer adjustments for special case (PR #94182)
Craig Topper via llvm-commits
llvm-commits at lists.llvm.org
Fri Jun 7 09:34:06 PDT 2024
================
@@ -511,16 +511,28 @@ bool RISCVRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
// We can encode an add with 12 bit signed immediate in the immediate
// operand of our user instruction. As a result, the remaining
// offset can by construction, at worst, a LUI and a ADD.
+
+ // Special case, try to split the offset across two ADDIs.
+ uint64_t ValSubLo12 = (uint64_t)Val - (uint64_t)Lo12;
+ if (ValSubLo12 == 4096 && (Lo12 > 0 && Lo12 < 2045))
----------------
topperc wrote:
Why `< 2045` instead of `<= 2045`?
https://github.com/llvm/llvm-project/pull/94182
More information about the llvm-commits
mailing list