[llvm] [AArch64][CodeGen] Add patterns for small negative VScale const (PR #89607)
Paul Walker via llvm-commits
llvm-commits at lists.llvm.org
Tue Apr 23 04:06:45 PDT 2024
================
@@ -2583,6 +2583,27 @@ let Predicates = [HasSVEorSME] in {
sub_32)>;
}
+ // Add NoUseScalarIncVL to avoid affecting for patterns with UseScalarIncVL
+ let Predicates = [NoUseScalarIncVL] in {
+ def : Pat<(add GPR64:$op, (vscale (sve_rdvl_imm i32:$imm))),
+ (ADDXrs GPR64:$op, (RDVLI_XI $imm), 0)>;
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paulwalker-arm wrote:
Is this necessary? We already have patterns for `(vscale (sve_rdvl_imm i32:$imm)` that will emit `(RDVLI_XI $imm)` so I don't think it hits the negated case this patch fixes.
https://github.com/llvm/llvm-project/pull/89607
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