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stage2: dedup DS/RIP encoding for memory operand in Isel

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This commit is contained in:
Jakub Konka 2022-01-02 01:00:21 +01:00
parent 8628bb780f
commit 7a8a630bb2
1 changed files with 15 additions and 35 deletions
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50
src/arch/x86_64/Isel.zig
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@ -1296,6 +1296,16 @@ const Memory = struct {
}
}
}
fn encodeDsOrRip(encoder: Encoder, op: u3, disp: i32, rip: bool) void {
if (rip) {
encoder.modRm_RIPDisp32(op);
} else {
encoder.modRm_SIBDisp0(op);
encoder.sib_disp32();
}
encoder.disp32(disp);
}
};
const RegisterOrMemory = union(enum) {
@ -1434,13 +1444,7 @@ fn lowerToMEnc(tag: Tag, reg_or_mem: RegisterOrMemory, code: *std.ArrayList(u8))
Memory.encodeWithReg(encoder, reg.lowId(), modrm_ext, mem_op.disp);
} else {
opc.encode(encoder);
if (mem_op.rip) {
encoder.modRm_RIPDisp32(modrm_ext);
} else {
encoder.modRm_SIBDisp0(modrm_ext);
encoder.sib_disp32();
}
encoder.disp32(mem_op.disp);
Memory.encodeDsOrRip(encoder, modrm_ext, mem_op.disp, mem_op.rip);
}
},
}
@ -1576,13 +1580,7 @@ fn lowerToMiEnc(tag: Tag, reg_or_mem: RegisterOrMemory, imm: i32, code: *std.Arr
Memory.encodeWithReg(encoder, dst_reg.lowId(), modrm_ext, dst_mem.disp);
} else {
opc.encode(encoder);
if (dst_mem.rip) {
encoder.modRm_RIPDisp32(modrm_ext);
} else {
encoder.modRm_SIBDisp0(modrm_ext);
encoder.sib_disp32();
}
encoder.disp32(dst_mem.disp);
Memory.encodeDsOrRip(encoder, modrm_ext, dst_mem.disp, dst_mem.rip);
}
switch (dst_mem.ptr_size) {
.byte_ptr => {
@ -1649,13 +1647,7 @@ fn lowerToRmEnc(
.r = reg.isExtended(),
});
opc.encode(encoder);
if (src_mem.rip) {
encoder.modRm_RIPDisp32(reg.lowId());
} else {
encoder.modRm_SIBDisp0(reg.lowId());
encoder.sib_disp32();
}
encoder.disp32(src_mem.disp);
Memory.encodeDsOrRip(encoder, reg.lowId(), src_mem.disp, src_mem.rip);
}
},
}
@ -1707,13 +1699,7 @@ fn lowerToMrEnc(
.r = reg.isExtended(),
});
opc.encode(encoder);
if (dst_mem.rip) {
encoder.modRm_RIPDisp32(reg.lowId());
} else {
encoder.modRm_SIBDisp0(reg.lowId());
encoder.sib_disp32();
}
encoder.disp32(dst_mem.disp);
Memory.encodeDsOrRip(encoder, reg.lowId(), dst_mem.disp, dst_mem.rip);
}
},
}
@ -1770,13 +1756,7 @@ fn lowerToRmiEnc(
.r = reg.isExtended(),
});
opc.encode(encoder);
if (src_mem.rip) {
encoder.modRm_RIPDisp32(reg.lowId());
} else {
encoder.modRm_SIBDisp0(reg.lowId());
encoder.sib_disp32();
}
encoder.disp32(src_mem.disp);
Memory.encodeDsOrRip(encoder, reg.lowId(), src_mem.disp, src_mem.rip);
}
},
}