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pulley: Initial scaffold of SIMD support
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This commit fills out some of the initial infrastructure necessary for
supporting the SIMD proposal to WebAssembly in the Pulley interpreter,
namely 128-bit simd. The `VRegVal` union has been filled out with
various types, endianness questions are settled, and initial
implementations of a suite of opcodes are added to get a basic set of
tests working throughout the backend.

cc bytecodealliance#9783
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alexcrichton committed Dec 12, 2024
1 parent a825154 commit 3a63f8d
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Showing 24 changed files with 534 additions and 96 deletions.
60 changes: 44 additions & 16 deletions cranelift/codegen/meta/src/pulley.rs
Original file line number Diff line number Diff line change
Expand Up @@ -27,19 +27,47 @@ const OPS: &[Inst<'_>] = pulley_interpreter::for_each_op!(define);
const EXTENDED_OPS: &[Inst<'_>] = pulley_interpreter::for_each_extended_op!(define);

enum Operand<'a> {
Normal { name: &'a str, ty: &'a str },
Writable { name: &'a str, ty: &'a str },
TrapCode { name: &'a str, ty: &'a str },
Binop { reg: &'a str },
Normal {
name: &'a str,
ty: &'a str,
},
Writable {
name: &'a str,
ty: &'a str,
},
TrapCode {
name: &'a str,
ty: &'a str,
},
Binop {
dst: &'a str,
src1: &'a str,
src2: &'a str,
},
}

impl Inst<'_> {
fn operands(&self) -> impl Iterator<Item = Operand<'_>> {
self.fields
.iter()
.map(|(name, ty)| match (*name, *ty) {
("operands", "BinaryOperands < XReg >") => Operand::Binop { reg: "XReg" },
("operands", "BinaryOperands < FReg >") => Operand::Binop { reg: "FReg" },
("operands", binop) => {
// Parse "BinaryOperands < A >"` as A/A/A
// Parse "BinaryOperands < A, B >"` as A/B/A
// Parse "BinaryOperands < A, B, C >"` as A/B/C
let mut parts = binop
.strip_prefix("BinaryOperands <")
.unwrap()
.strip_suffix(">")
.unwrap()
.trim()
.split(',')
.map(|x| x.trim());
let dst = parts.next().unwrap();
let src1 = parts.next().unwrap_or(dst);
let src2 = parts.next().unwrap_or(dst);
Operand::Binop { dst, src1, src2 }
}
("dst", ty) => Operand::Writable { name, ty },
(name, ty) => Operand::Normal { name, ty },
})
Expand Down Expand Up @@ -109,7 +137,7 @@ pub fn generate_rust(filename: &str, out_dir: &Path) -> Result<(), Error> {
pat.push_str(",");
format_string.push_str(&format!(" // trap={{{name}:?}}"));
}
Operand::Binop { reg: _ } => {
Operand::Binop { .. } => {
pat.push_str("dst, src1, src2,");
format_string.push_str(" {dst}, {src1}, {src2}");
locals.push_str(&format!("let dst = reg_name(*dst.to_reg());\n"));
Expand Down Expand Up @@ -161,7 +189,7 @@ pub fn generate_rust(filename: &str, out_dir: &Path) -> Result<(), Error> {
}
}
Operand::TrapCode { .. } => {}
Operand::Binop { reg: _ } => {
Operand::Binop { .. } => {
pat.push_str("dst, src1, src2,");
uses.push("src1");
uses.push("src2");
Expand Down Expand Up @@ -221,7 +249,7 @@ pub fn generate_rust(filename: &str, out_dir: &Path) -> Result<(), Error> {
pat.push_str(",");
trap.push_str(&format!("sink.add_trap({name});\n"));
}
Operand::Binop { reg: _ } => {
Operand::Binop { .. } => {
pat.push_str("dst, src1, src2,");
args.push_str(
"pulley_interpreter::regs::BinaryOperands::new(dst, src1, src2),",
Expand Down Expand Up @@ -265,10 +293,10 @@ pub fn generate_isle(filename: &str, out_dir: &Path) -> Result<(), Error> {
Operand::Writable { name, ty } => {
isle.push_str(&format!("\n ({name} Writable{ty})"));
}
Operand::Binop { reg } => {
isle.push_str(&format!("\n (dst Writable{reg})"));
isle.push_str(&format!("\n (src1 {reg})"));
isle.push_str(&format!("\n (src2 {reg})"));
Operand::Binop { dst, src1, src2 } => {
isle.push_str(&format!("\n (dst Writable{dst})"));
isle.push_str(&format!("\n (src1 {src1})"));
isle.push_str(&format!("\n (src2 {src2})"));
}
}
}
Expand Down Expand Up @@ -303,13 +331,13 @@ pub fn generate_isle(filename: &str, out_dir: &Path) -> Result<(), Error> {
assert!(result.is_none(), "{} has >1 result", inst.snake_name);
result = Some(ty);
}
Operand::Binop { reg } => {
isle.push_str(&format!("{reg} {reg}"));
Operand::Binop { dst, src1, src2 } => {
isle.push_str(&format!("{src1} {src2}"));
rule.push_str("src1 src2");
ops.push("src1");
ops.push("src2");
assert!(result.is_none(), "{} has >1 result", inst.snake_name);
result = Some(reg);
result = Some(dst);
}
}
isle.push_str(" ");
Expand Down
21 changes: 11 additions & 10 deletions cranelift/codegen/src/isa/pulley_shared/abi.rs
Original file line number Diff line number Diff line change
Expand Up @@ -531,17 +531,18 @@ where
_target_vector_bytes: u32,
_isa_flags: &PulleyFlags,
) -> u32 {
// Spill slots are the size of a "word" or a pointer, but Pulley
// registers are 8-byte for integers/floats regardless of pointer size.
// Calculate the number of slots necessary to store 8 bytes.
let slots_for_8bytes = match P::pointer_width() {
PointerWidth::PointerWidth32 => 2,
PointerWidth::PointerWidth64 => 1,
};
match rc {
// Spilling an integer or float register requires spilling 8 bytes,
// and spill slots are defined in terms of "word bytes" or the size
// of a pointer. That means on 32-bit pulley we need to take up two
// spill slots where on 64-bit pulley we need to only take up one
// spill slot for integers.
RegClass::Int | RegClass::Float => match P::pointer_width() {
PointerWidth::PointerWidth32 => 2,
PointerWidth::PointerWidth64 => 1,
},
RegClass::Vector => unreachable!(),
// Int/float registers are 8-bytes
RegClass::Int | RegClass::Float => slots_for_8bytes,
// Vector registers are 16 bytes
RegClass::Vector => 2 * slots_for_8bytes,
}
}

Expand Down
10 changes: 10 additions & 0 deletions cranelift/codegen/src/isa/pulley_shared/inst.isle
Original file line number Diff line number Diff line change
Expand Up @@ -420,6 +420,16 @@
(rule (pulley_fstore amode src ty flags)
(SideEffectNoResult.Inst (MInst.FStore amode src ty flags)))

(decl pulley_vload (Amode Type MemFlags) VReg)
(rule (pulley_vload amode ty flags)
(let ((dst WritableVReg (temp_writable_vreg))
(_ Unit (emit (MInst.VLoad dst amode ty flags))))
dst))

(decl pulley_vstore (Amode VReg Type MemFlags) SideEffectNoResult)
(rule (pulley_vstore amode src ty flags)
(SideEffectNoResult.Inst (MInst.VStore amode src ty flags)))

(decl gen_br_table (XReg MachLabel BoxVecMachLabel) Unit)
(rule (gen_br_table idx default labels)
(emit (MInst.BrTable idx default labels)))
Expand Down
14 changes: 2 additions & 12 deletions cranelift/codegen/src/isa/pulley_shared/inst/mod.rs
Original file line number Diff line number Diff line change
Expand Up @@ -453,18 +453,8 @@ where
}

fn worst_case_size() -> CodeOffset {
// `BrIfXeq32 { a, b, taken, not_taken }` expands to `br_if_xeq32 a, b, taken; jump not_taken`.
//
// The first instruction is seven bytes long:
// * 1 byte opcode
// * 1 byte `a` register encoding
// * 1 byte `b` register encoding
// * 4 byte `taken` displacement
//
// And the second instruction is five bytes long:
// * 1 byte opcode
// * 4 byte `not_taken` displacement
12
// `Vconst128 { dst, imm }` is 18 bytes (opcode + dst + 16-byte imm)
18
}

fn ref_type_regclass(_settings: &settings::Flags) -> RegClass {
Expand Down
32 changes: 32 additions & 0 deletions cranelift/codegen/src/isa/pulley_shared/lower.isle
Original file line number Diff line number Diff line change
Expand Up @@ -145,6 +145,11 @@
(rule (lower (has_type $I64 (iadd a b)))
(pulley_xadd64 a b))

(rule (lower (has_type $I8X16 (iadd a b))) (pulley_vaddi8x16 a b))
(rule (lower (has_type $I16X8 (iadd a b))) (pulley_vaddi16x8 a b))
(rule (lower (has_type $I32X4 (iadd a b))) (pulley_vaddi32x4 a b))
(rule (lower (has_type $I64X2 (iadd a b))) (pulley_vaddi64x2 a b))

;;;; Rules for `isub` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(rule (lower (has_type $I8 (isub a b)))
Expand Down Expand Up @@ -201,6 +206,11 @@
(rule (lower (has_type $I64 (ishl a b)))
(pulley_xshl64 a b))

(rule (lower (has_type $I8X16 (ishl a b))) (pulley_vshli8x16 a b))
(rule (lower (has_type $I16X8 (ishl a b))) (pulley_vshli16x8 a b))
(rule (lower (has_type $I32X4 (ishl a b))) (pulley_vshli32x4 a b))
(rule (lower (has_type $I64X2 (ishl a b))) (pulley_vshli64x2 a b))

;;;; Rules for `ushr` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(rule (lower (has_type $I32 (ushr a b)))
Expand All @@ -209,6 +219,11 @@
(rule (lower (has_type $I64 (ushr a b)))
(pulley_xshr64_u a b))

(rule (lower (has_type $I8X16 (ushr a b))) (pulley_vshri8x16_u a b))
(rule (lower (has_type $I16X8 (ushr a b))) (pulley_vshri16x8_u a b))
(rule (lower (has_type $I32X4 (ushr a b))) (pulley_vshri32x4_u a b))
(rule (lower (has_type $I64X2 (ushr a b))) (pulley_vshri64x2_u a b))

;;;; Rules for `sshr` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(rule (lower (has_type $I32 (sshr a b)))
Expand All @@ -217,6 +232,11 @@
(rule (lower (has_type $I64 (sshr a b)))
(pulley_xshr64_s a b))

(rule (lower (has_type $I8X16 (sshr a b))) (pulley_vshri8x16_s a b))
(rule (lower (has_type $I16X8 (sshr a b))) (pulley_vshri16x8_s a b))
(rule (lower (has_type $I32X4 (sshr a b))) (pulley_vshri32x4_s a b))
(rule (lower (has_type $I64X2 (sshr a b))) (pulley_vshri64x2_s a b))

;;;; Rules for `band` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(rule 0 (lower (has_type (fits_in_32 _) (band a b)))
Expand Down Expand Up @@ -423,6 +443,9 @@
(rule 1 (lower (has_type $I64 (sload32 flags addr offset)))
(pulley_xload (amode addr offset) $I32 flags (ExtKind.Sign64)))

(rule 2 (lower (has_type (ty_vec128 ty) (load flags addr offset)))
(pulley_vload (amode addr offset) ty flags))

;;;; Rules for `store` and friends ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(rule (lower (store flags src @ (value_type (ty_int ty)) addr offset))
Expand All @@ -440,6 +463,9 @@
(rule (lower (istore32 flags src addr offset))
(side_effect (pulley_xstore (amode addr offset) src $I32 flags)))

(rule 2 (lower (store flags src @ (value_type (ty_vec128 ty)) addr offset))
(side_effect (pulley_vstore (amode addr offset) src ty flags)))

;;;; Rules for `stack_addr` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(rule (lower (stack_addr stack_slot offset))
Expand Down Expand Up @@ -623,6 +649,8 @@

(rule (lower (has_type $F32 (fadd a b))) (pulley_fadd32 a b))
(rule (lower (has_type $F64 (fadd a b))) (pulley_fadd64 a b))
(rule (lower (has_type $F32X4 (fadd a b))) (pulley_vaddf32x4 a b))
(rule (lower (has_type $F64X2 (fadd a b))) (pulley_vaddf64x2 a b))

;;;; Rules for `fsub` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

Expand Down Expand Up @@ -693,3 +721,7 @@

(rule (lower (has_type $F32 (fabs a))) (pulley_fabs32 a))
(rule (lower (has_type $F64 (fabs a))) (pulley_fabs64 a))

;;;; Rules for `vconst` ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(rule (lower (has_type (ty_vec128 _) (vconst (u128_from_constant a)))) (pulley_vconst128 a))
14 changes: 7 additions & 7 deletions cranelift/filetests/filetests/isa/pulley32/call.clif
Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ block0:
; push_frame
; block0:
; xconst8 x0, 0
; call CallInfo { dest: TestCase(%g), uses: [CallArgPair { vreg: p0i, preg: p0i }], defs: [CallRetPair { vreg: Writable { reg: p0i }, preg: p0i }], clobbers: PRegSet { bits: [65534, 65279, 4294967295, 0] }, callee_conv: Fast, caller_conv: Fast, callee_pop_size: 0 }
; call CallInfo { dest: TestCase(%g), uses: [CallArgPair { vreg: p0i, preg: p0i }], defs: [CallRetPair { vreg: Writable { reg: p0i }, preg: p0i }], clobbers: PRegSet { bits: [65534, 65535, 4294967295, 0] }, callee_conv: Fast, caller_conv: Fast, callee_pop_size: 0 }
; xconst8 x0, 1
; pop_frame
; ret
Expand All @@ -43,7 +43,7 @@ block0:
; push_frame
; block0:
; xconst8 x0, 0
; call CallInfo { dest: TestCase(%g), uses: [CallArgPair { vreg: p0i, preg: p0i }], defs: [CallRetPair { vreg: Writable { reg: p0i }, preg: p0i }], clobbers: PRegSet { bits: [65534, 65279, 4294967295, 0] }, callee_conv: Fast, caller_conv: Fast, callee_pop_size: 0 }
; call CallInfo { dest: TestCase(%g), uses: [CallArgPair { vreg: p0i, preg: p0i }], defs: [CallRetPair { vreg: Writable { reg: p0i }, preg: p0i }], clobbers: PRegSet { bits: [65534, 65535, 4294967295, 0] }, callee_conv: Fast, caller_conv: Fast, callee_pop_size: 0 }
; xconst8 x0, 1
; pop_frame
; ret
Expand Down Expand Up @@ -75,7 +75,7 @@ block0:
; xconst8 x1, 1
; xconst8 x2, 2
; xconst8 x3, 3
; call CallInfo { dest: TestCase(%g), uses: [CallArgPair { vreg: p0i, preg: p0i }, CallArgPair { vreg: p1i, preg: p1i }, CallArgPair { vreg: p2i, preg: p2i }, CallArgPair { vreg: p3i, preg: p3i }], defs: [], clobbers: PRegSet { bits: [65535, 65279, 4294967295, 0] }, callee_conv: Fast, caller_conv: Fast, callee_pop_size: 0 }
; call CallInfo { dest: TestCase(%g), uses: [CallArgPair { vreg: p0i, preg: p0i }, CallArgPair { vreg: p1i, preg: p1i }, CallArgPair { vreg: p2i, preg: p2i }, CallArgPair { vreg: p3i, preg: p3i }], defs: [], clobbers: PRegSet { bits: [65535, 65535, 4294967295, 0] }, callee_conv: Fast, caller_conv: Fast, callee_pop_size: 0 }
; pop_frame
; ret
;
Expand Down Expand Up @@ -103,7 +103,7 @@ block0:
; VCode:
; push_frame
; block0:
; call CallInfo { dest: TestCase(%g), uses: [], defs: [CallRetPair { vreg: Writable { reg: p0i }, preg: p0i }, CallRetPair { vreg: Writable { reg: p1i }, preg: p1i }, CallRetPair { vreg: Writable { reg: p2i }, preg: p2i }, CallRetPair { vreg: Writable { reg: p3i }, preg: p3i }], clobbers: PRegSet { bits: [65520, 65279, 4294967295, 0] }, callee_conv: Fast, caller_conv: Fast, callee_pop_size: 0 }
; call CallInfo { dest: TestCase(%g), uses: [], defs: [CallRetPair { vreg: Writable { reg: p0i }, preg: p0i }, CallRetPair { vreg: Writable { reg: p1i }, preg: p1i }, CallRetPair { vreg: Writable { reg: p2i }, preg: p2i }, CallRetPair { vreg: Writable { reg: p3i }, preg: p3i }], clobbers: PRegSet { bits: [65520, 65535, 4294967295, 0] }, callee_conv: Fast, caller_conv: Fast, callee_pop_size: 0 }
; xadd64 x4, x0, x2
; xadd64 x3, x1, x3
; xadd64 x0, x4, x3
Expand Down Expand Up @@ -154,7 +154,7 @@ block0:
; xmov x12, x15
; xmov x13, x15
; xmov x14, x15
; call CallInfo { dest: TestCase(%g), uses: [CallArgPair { vreg: p0i, preg: p0i }, CallArgPair { vreg: p1i, preg: p1i }, CallArgPair { vreg: p2i, preg: p2i }, CallArgPair { vreg: p3i, preg: p3i }, CallArgPair { vreg: p4i, preg: p4i }, CallArgPair { vreg: p5i, preg: p5i }, CallArgPair { vreg: p6i, preg: p6i }, CallArgPair { vreg: p7i, preg: p7i }, CallArgPair { vreg: p8i, preg: p8i }, CallArgPair { vreg: p9i, preg: p9i }, CallArgPair { vreg: p10i, preg: p10i }, CallArgPair { vreg: p11i, preg: p11i }, CallArgPair { vreg: p12i, preg: p12i }, CallArgPair { vreg: p13i, preg: p13i }, CallArgPair { vreg: p14i, preg: p14i }, CallArgPair { vreg: p15i, preg: p15i }], defs: [], clobbers: PRegSet { bits: [65535, 65279, 4294967295, 0] }, callee_conv: Fast, caller_conv: Fast, callee_pop_size: 0 }
; call CallInfo { dest: TestCase(%g), uses: [CallArgPair { vreg: p0i, preg: p0i }, CallArgPair { vreg: p1i, preg: p1i }, CallArgPair { vreg: p2i, preg: p2i }, CallArgPair { vreg: p3i, preg: p3i }, CallArgPair { vreg: p4i, preg: p4i }, CallArgPair { vreg: p5i, preg: p5i }, CallArgPair { vreg: p6i, preg: p6i }, CallArgPair { vreg: p7i, preg: p7i }, CallArgPair { vreg: p8i, preg: p8i }, CallArgPair { vreg: p9i, preg: p9i }, CallArgPair { vreg: p10i, preg: p10i }, CallArgPair { vreg: p11i, preg: p11i }, CallArgPair { vreg: p12i, preg: p12i }, CallArgPair { vreg: p13i, preg: p13i }, CallArgPair { vreg: p14i, preg: p14i }, CallArgPair { vreg: p15i, preg: p15i }], defs: [], clobbers: PRegSet { bits: [65535, 65535, 4294967295, 0] }, callee_conv: Fast, caller_conv: Fast, callee_pop_size: 0 }
; stack_free32 48
; pop_frame
; ret
Expand Down Expand Up @@ -237,7 +237,7 @@ block0:
; xstore64 sp+56, x25 // flags = notrap aligned
; block0:
; x0 = load_addr OutgoingArg(0)
; call CallInfo { dest: TestCase(%g), uses: [CallArgPair { vreg: p0i, preg: p0i }], defs: [CallRetPair { vreg: Writable { reg: p0i }, preg: p0i }, CallRetPair { vreg: Writable { reg: p1i }, preg: p1i }, CallRetPair { vreg: Writable { reg: p2i }, preg: p2i }, CallRetPair { vreg: Writable { reg: p3i }, preg: p3i }, CallRetPair { vreg: Writable { reg: p4i }, preg: p4i }, CallRetPair { vreg: Writable { reg: p5i }, preg: p5i }, CallRetPair { vreg: Writable { reg: p6i }, preg: p6i }, CallRetPair { vreg: Writable { reg: p7i }, preg: p7i }, CallRetPair { vreg: Writable { reg: p8i }, preg: p8i }, CallRetPair { vreg: Writable { reg: p9i }, preg: p9i }, CallRetPair { vreg: Writable { reg: p10i }, preg: p10i }, CallRetPair { vreg: Writable { reg: p11i }, preg: p11i }, CallRetPair { vreg: Writable { reg: p12i }, preg: p12i }, CallRetPair { vreg: Writable { reg: p13i }, preg: p13i }, CallRetPair { vreg: Writable { reg: p14i }, preg: p14i }, CallRetPair { vreg: Writable { reg: p15i }, preg: p15i }], clobbers: PRegSet { bits: [0, 65279, 4294967295, 0] }, callee_conv: Fast, caller_conv: Fast, callee_pop_size: 0 }
; call CallInfo { dest: TestCase(%g), uses: [CallArgPair { vreg: p0i, preg: p0i }], defs: [CallRetPair { vreg: Writable { reg: p0i }, preg: p0i }, CallRetPair { vreg: Writable { reg: p1i }, preg: p1i }, CallRetPair { vreg: Writable { reg: p2i }, preg: p2i }, CallRetPair { vreg: Writable { reg: p3i }, preg: p3i }, CallRetPair { vreg: Writable { reg: p4i }, preg: p4i }, CallRetPair { vreg: Writable { reg: p5i }, preg: p5i }, CallRetPair { vreg: Writable { reg: p6i }, preg: p6i }, CallRetPair { vreg: Writable { reg: p7i }, preg: p7i }, CallRetPair { vreg: Writable { reg: p8i }, preg: p8i }, CallRetPair { vreg: Writable { reg: p9i }, preg: p9i }, CallRetPair { vreg: Writable { reg: p10i }, preg: p10i }, CallRetPair { vreg: Writable { reg: p11i }, preg: p11i }, CallRetPair { vreg: Writable { reg: p12i }, preg: p12i }, CallRetPair { vreg: Writable { reg: p13i }, preg: p13i }, CallRetPair { vreg: Writable { reg: p14i }, preg: p14i }, CallRetPair { vreg: Writable { reg: p15i }, preg: p15i }], clobbers: PRegSet { bits: [0, 65535, 4294967295, 0] }, callee_conv: Fast, caller_conv: Fast, callee_pop_size: 0 }
; xmov x18, x13
; xmov x20, x11
; x24 = xload64 OutgoingArg(0) // flags = notrap aligned
Expand Down Expand Up @@ -347,7 +347,7 @@ block0(v0: i32):
; VCode:
; push_frame
; block0:
; indirect_call x0, CallInfo { dest: XReg(p0i), uses: [], defs: [CallRetPair { vreg: Writable { reg: p0i }, preg: p0i }], clobbers: PRegSet { bits: [65534, 65279, 4294967295, 0] }, callee_conv: Tail, caller_conv: Fast, callee_pop_size: 0 }
; indirect_call x0, CallInfo { dest: XReg(p0i), uses: [], defs: [CallRetPair { vreg: Writable { reg: p0i }, preg: p0i }], clobbers: PRegSet { bits: [65534, 65535, 4294967295, 0] }, callee_conv: Tail, caller_conv: Fast, callee_pop_size: 0 }
; pop_frame
; ret
;
Expand Down
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