1 use super::{InlineAsmArch, InlineAsmType};
2 use crate::spec::Target;
3 use rustc_data_structures::stable_set::FxHashSet;
4 use rustc_macros::HashStable_Generic;
5 use rustc_span::{sym, Symbol};
9 Arm ArmInlineAsmRegClass {
22 impl ArmInlineAsmRegClass {
23 pub fn valid_modifiers(self, _arch: super::InlineAsmArch) -> &'static [char] {
25 Self::qreg | Self::qreg_low8 | Self::qreg_low4 => &['e', 'f'],
30 pub fn suggest_class(self, _arch: InlineAsmArch, _ty: InlineAsmType) -> Option<Self> {
34 pub fn suggest_modifier(
38 ) -> Option<(char, &'static str)> {
42 pub fn default_modifier(self, _arch: InlineAsmArch) -> Option<(char, &'static str)> {
46 pub fn supported_types(
49 ) -> &'static [(InlineAsmType, Option<Symbol>)] {
51 Self::reg => types! { _: I8, I16, I32, F32; },
52 Self::sreg | Self::sreg_low16 => types! { vfp2: I32, F32; },
53 Self::dreg | Self::dreg_low16 | Self::dreg_low8 => types! {
54 vfp2: I64, F64, VecI8(8), VecI16(4), VecI32(2), VecI64(1), VecF32(2);
56 Self::qreg | Self::qreg_low8 | Self::qreg_low4 => types! {
57 neon: VecI8(16), VecI16(8), VecI32(4), VecI64(2), VecF32(4);
63 // This uses the same logic as useR7AsFramePointer in LLVM
64 fn frame_pointer_is_r7(target_features: &FxHashSet<Symbol>, target: &Target) -> bool {
65 target.is_like_osx || (!target.is_like_windows && target_features.contains(&sym::thumb_mode))
70 target_features: &FxHashSet<Symbol>,
72 ) -> Result<(), &'static str> {
73 if !frame_pointer_is_r7(target_features, target) {
74 Err("the frame pointer (r11) cannot be used as an operand for inline asm")
82 target_features: &FxHashSet<Symbol>,
84 ) -> Result<(), &'static str> {
85 if frame_pointer_is_r7(target_features, target) {
86 Err("the frame pointer (r7) cannot be used as an operand for inline asm")
94 target_features: &FxHashSet<Symbol>,
96 ) -> Result<(), &'static str> {
97 if target_features.contains(&sym::thumb_mode) && !target_features.contains(&sym::thumb2) {
98 Err("high registers (r8+) cannot be used in Thumb-1 code")
106 target_features: &FxHashSet<Symbol>,
108 ) -> Result<(), &'static str> {
109 not_thumb1(arch, target_features, target)?;
111 // We detect this using the reserved-r9 feature instead of using the target
112 // because the relocation model can be changed with compiler options.
113 if target_features.contains(&sym::reserved_r9) {
114 Err("the RWPI static base register (r9) cannot be used as an operand for inline asm")
121 Arm ArmInlineAsmReg ArmInlineAsmRegClass {
122 r0: reg = ["r0", "a1"],
123 r1: reg = ["r1", "a2"],
124 r2: reg = ["r2", "a3"],
125 r3: reg = ["r3", "a4"],
126 r4: reg = ["r4", "v1"],
127 r5: reg = ["r5", "v2"],
128 r7: reg = ["r7", "v4"] % frame_pointer_r7,
129 r8: reg = ["r8", "v5"] % not_thumb1,
130 r9: reg = ["r9", "v6", "rfp"] % reserved_r9,
131 r10: reg = ["r10", "sl"] % not_thumb1,
132 r11: reg = ["r11", "fp"] % frame_pointer_r11,
133 r12: reg = ["r12", "ip"] % not_thumb1,
134 r14: reg = ["r14", "lr"] % not_thumb1,
135 s0: sreg, sreg_low16 = ["s0"],
136 s1: sreg, sreg_low16 = ["s1"],
137 s2: sreg, sreg_low16 = ["s2"],
138 s3: sreg, sreg_low16 = ["s3"],
139 s4: sreg, sreg_low16 = ["s4"],
140 s5: sreg, sreg_low16 = ["s5"],
141 s6: sreg, sreg_low16 = ["s6"],
142 s7: sreg, sreg_low16 = ["s7"],
143 s8: sreg, sreg_low16 = ["s8"],
144 s9: sreg, sreg_low16 = ["s9"],
145 s10: sreg, sreg_low16 = ["s10"],
146 s11: sreg, sreg_low16 = ["s11"],
147 s12: sreg, sreg_low16 = ["s12"],
148 s13: sreg, sreg_low16 = ["s13"],
149 s14: sreg, sreg_low16 = ["s14"],
150 s15: sreg, sreg_low16 = ["s15"],
167 d0: dreg, dreg_low16, dreg_low8 = ["d0"],
168 d1: dreg, dreg_low16, dreg_low8 = ["d1"],
169 d2: dreg, dreg_low16, dreg_low8 = ["d2"],
170 d3: dreg, dreg_low16, dreg_low8 = ["d3"],
171 d4: dreg, dreg_low16, dreg_low8 = ["d4"],
172 d5: dreg, dreg_low16, dreg_low8 = ["d5"],
173 d6: dreg, dreg_low16, dreg_low8 = ["d6"],
174 d7: dreg, dreg_low16, dreg_low8 = ["d7"],
175 d8: dreg, dreg_low16 = ["d8"],
176 d9: dreg, dreg_low16 = ["d9"],
177 d10: dreg, dreg_low16 = ["d10"],
178 d11: dreg, dreg_low16 = ["d11"],
179 d12: dreg, dreg_low16 = ["d12"],
180 d13: dreg, dreg_low16 = ["d13"],
181 d14: dreg, dreg_low16 = ["d14"],
182 d15: dreg, dreg_low16 = ["d15"],
199 q0: qreg, qreg_low8, qreg_low4 = ["q0"],
200 q1: qreg, qreg_low8, qreg_low4 = ["q1"],
201 q2: qreg, qreg_low8, qreg_low4 = ["q2"],
202 q3: qreg, qreg_low8, qreg_low4 = ["q3"],
203 q4: qreg, qreg_low8 = ["q4"],
204 q5: qreg, qreg_low8 = ["q5"],
205 q6: qreg, qreg_low8 = ["q6"],
206 q7: qreg, qreg_low8 = ["q7"],
215 #error = ["r6", "v3"] =>
216 "r6 is used internally by LLVM and cannot be used as an operand for inline asm",
217 #error = ["r13", "sp"] =>
218 "the stack pointer cannot be used as an operand for inline asm",
219 #error = ["r15", "pc"] =>
220 "the program pointer cannot be used as an operand for inline asm",
224 impl ArmInlineAsmReg {
227 out: &mut dyn fmt::Write,
228 _arch: InlineAsmArch,
229 modifier: Option<char>,
231 // Only qreg is allowed to have modifiers. This should have been
232 // validated already by now.
233 if let Some(modifier) = modifier {
234 let index = self as u32 - Self::q0 as u32;
236 let index = index * 2 + (modifier == 'f') as u32;
237 write!(out, "d{}", index)
239 out.write_str(self.name())
243 pub fn overlapping_regs(self, mut cb: impl FnMut(ArmInlineAsmReg)) {
246 macro_rules! reg_conflicts {
249 $q:ident : $d0:ident $d1:ident : $s0:ident $s1:ident $s2:ident $s3:ident
252 $q_high:ident : $d0_high:ident $d1_high:ident
275 Self::$s0 | Self::$s1 => {
279 Self::$s2 | Self::$s3 => {
289 Self::$d0_high | Self::$d1_high => {
298 // ARM's floating-point register file is interesting in that it can be
299 // viewed as 16 128-bit registers, 32 64-bit registers or 32 32-bit
300 // registers. Because these views overlap, the registers of different
301 // widths will conflict (e.g. d0 overlaps with s0 and s1, and q1
302 // overlaps with d2 and d3).
304 // See section E1.3.1 of the ARM Architecture Reference Manual for
305 // ARMv8-A for more details.
307 q0 : d0 d1 : s0 s1 s2 s3,
308 q1 : d2 d3 : s4 s5 s6 s7,
309 q2 : d4 d5 : s8 s9 s10 s11,
310 q3 : d6 d7 : s12 s13 s14 s15,
311 q4 : d8 d9 : s16 s17 s18 s19,
312 q5 : d10 d11 : s20 s21 s22 s23,
313 q6 : d12 d13 : s24 s25 s26 s27,
314 q7 : d14 d15 : s28 s29 s30 s31;