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[RISCV][MC] Implicit 0-offset aliases for JR/JALR #94688

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Merged
merged 2 commits into from
Jun 8, 2024
Merged

[RISCV][MC] Implicit 0-offset aliases for JR/JALR #94688

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d3c27ff
[RISCV][MC] Implicit 0-offset aliases for JR/JALR
lenary Jun 6, 2024
e4e284e
fixup! [RISCV][MC] Implicit 0-offset aliases for JR/JALR
lenary Jun 7, 2024
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3 changes: 3 additions & 0 deletions llvm/lib/Target/RISCV/RISCVInstrInfo.td
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Original file line number Diff line number Diff line change
Expand Up @@ -943,6 +943,9 @@ def : InstAlias<"ret", (JALR X0, X1, 0), 4>;
def : InstAlias<"jr $rs, $offset", (JALR X0, GPR:$rs, simm12:$offset), 0>;
def : InstAlias<"jalr $rs, $offset", (JALR X1, GPR:$rs, simm12:$offset), 0>;
def : InstAlias<"jalr $rd, $rs, $offset", (JALR GPR:$rd, GPR:$rs, simm12:$offset), 0>;
def : InstAlias<"jr (${rs})", (JALR X0, GPR:$rs, 0), 0>;
def : InstAlias<"jalr (${rs})", (JALR X1, GPR:$rs, 0), 0>;
def : InstAlias<"jalr $rd, (${rs})", (JALR GPR:$rd, GPR:$rs, 0), 0>;

def : InstAlias<"fence", (FENCE 0xF, 0xF)>; // 0xF == iorw

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10 changes: 10 additions & 0 deletions llvm/test/MC/RISCV/rvi-aliases-valid.s
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Expand Up @@ -190,6 +190,16 @@ jalr x25, x26, 11
# CHECK-S-OBJ-NOALIAS: jalr zero, 0(ra)
# CHECK-S-OBJ: ret
ret
# CHECK-S-OBJ-NOALIAS: jalr zero, 0(s11)
# CHECK-S-OBJ: jr s11
jr (x27)
# CHECK-S-OBJ-NOALIAS: jalr ra, 0(t3)
# CHECK-S-OBJ: jalr t3
jalr (x28)
# CHECK-S-OBJ-NOALIAS: jalr t4, 0(t5)
# CHECK-S-OBJ: jalr t4, t5
jalr x29, (x30)

# TODO call
# TODO tail

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