From 6a53b7f8c3ce90791e3988b6cb9c4a9808e8d984 Mon Sep 17 00:00:00 2001 From: Richard-Qin-X Date: Sat, 15 Aug 2026 03:55:37 +0800 Subject: [GlobalISel] Lower byte-swap operations --- backend/lib/Target/RISCV/GISel/RISCVLegalizerInfo.cpp | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'backend/lib/Target/RISCV') diff --git a/backend/lib/Target/RISCV/GISel/RISCVLegalizerInfo.cpp b/backend/lib/Target/RISCV/GISel/RISCVLegalizerInfo.cpp index b87eaca..0dd99da 100644 --- a/backend/lib/Target/RISCV/GISel/RISCVLegalizerInfo.cpp +++ b/backend/lib/Target/RISCV/GISel/RISCVLegalizerInfo.cpp @@ -363,7 +363,11 @@ RISCVLegalizerInfo::RISCVLegalizerInfo(const RISCVSubtarget &Subtarget) { .customFor(HasZbb, {{S32, S32}}) .lower(); getActionDefinitionsBuilder(opcode(GenericOpcode::G_BITREVERSE)).maxScalar(0, S64).lower(); - getActionDefinitionsBuilder(opcode(GenericOpcode::G_BSWAP)).maxScalar(0, S64).lower(); + auto &ByteSwapActions = getActionDefinitionsBuilder(opcode(GenericOpcode::G_BSWAP)); + if (HasZbb) + ByteSwapActions.legalFor({S64}).clampScalar(0, S64, S64); + else + ByteSwapActions.maxScalar(0, S64).lower(); getActionDefinitionsBuilder( {opcode(GenericOpcode::G_CTLZ), opcode(GenericOpcode::G_CTTZ), opcode(GenericOpcode::G_CTLS)}) -- cgit v1.2.3