[WebAssembly] Add Libcall signatures for modf and variants (#130201)

Clang now lowers modf/modff/modfl as builtins using the llvm.modf
intrinsic.

Author: dschuff

llvm/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp

@@ -45,9 +45,11 @@ enum RuntimeLibcallSignature {
   i64_func_i64,
   f32_func_f32_f32,
   f32_func_f32_i32,
+  f32_func_f32_iPTR,
   f32_func_i64_i64,
   f64_func_f64_f64,
   f64_func_f64_i32,
+  f64_func_f64_iPTR,
   f64_func_i64_i64,
   i16_func_f32,
   i16_func_f64,
@@ -69,6 +71,7 @@ enum RuntimeLibcallSignature {
   i16_i16_func_i16_i16,
   i32_i32_func_i32_i32,
   i64_i64_func_i64_i64,
+  i64_i64_func_i64_i64_iPTR,
   i64_i64_func_i64_i64_i64_i64,
   i64_i64_func_i64_i64_i64_i64_iPTR,
   i64_i64_i64_i64_func_i64_i64_i64_i64,
@@ -278,6 +281,9 @@ struct RuntimeLibcallSignatureTable {
     Table[RTLIB::FREXP_F32] = f32_func_f32_i32;
     Table[RTLIB::FREXP_F64] = f64_func_f64_i32;
     Table[RTLIB::FREXP_F128] = i64_i64_func_i64_i64_i32;
+    Table[RTLIB::MODF_F32] = f32_func_f32_iPTR;
+    Table[RTLIB::MODF_F64] = f64_func_f64_iPTR;
+    Table[RTLIB::MODF_F128] = i64_i64_func_i64_i64_iPTR;
 
     // Conversion
     // All F80 and PPCF128 routines are unsupported.
@@ -628,6 +634,11 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
     Params.push_back(wasm::ValType::F32);
     Params.push_back(wasm::ValType::I32);
     break;
+  case f32_func_f32_iPTR:
+    Rets.push_back(wasm::ValType::F32);
+    Params.push_back(wasm::ValType::F32);
+    Params.push_back(PtrTy);
+    break;
   case f32_func_i64_i64:
     Rets.push_back(wasm::ValType::F32);
     Params.push_back(wasm::ValType::I64);
@@ -648,6 +659,11 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
     Params.push_back(wasm::ValType::I64);
     Params.push_back(wasm::ValType::I64);
     break;
+  case f64_func_f64_iPTR:
+    Rets.push_back(wasm::ValType::F64);
+    Params.push_back(wasm::ValType::F64);
+    Params.push_back(PtrTy);
+    break;
   case i16_func_f32:
     Rets.push_back(wasm::ValType::I32);
     Params.push_back(wasm::ValType::F32);
@@ -761,6 +777,17 @@ void WebAssembly::getLibcallSignature(const WebAssemblySubtarget &Subtarget,
     Params.push_back(wasm::ValType::I64);
     Params.push_back(wasm::ValType::I64);
     break;
+  case i64_i64_func_i64_i64_iPTR:
+    if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
+      Rets.push_back(wasm::ValType::I64);
+      Rets.push_back(wasm::ValType::I64);
+    } else {
+      Params.push_back(PtrTy);
+    }
+    Params.push_back(wasm::ValType::I64);
+    Params.push_back(wasm::ValType::I64);
+    Params.push_back(PtrTy);
+    break;
   case i64_i64_func_i64_i64_i64_i64:
     if (WebAssembly::canLowerMultivalueReturn(&Subtarget)) {
       Rets.push_back(wasm::ValType::I64);

llvm/test/CodeGen/WebAssembly/libcalls.ll

@@ -23,6 +23,7 @@ declare double @llvm.exp10.f64(double)
 declare double @llvm.ldexp.f64.i32(double, i32)
 declare {double, i32} @llvm.frexp.f64.i32(double)
 declare i32 @llvm.lround(double)
+declare {double, double} @llvm.modf.f64(double)
 
 declare void @escape_value(i32)
 
@@ -203,38 +204,44 @@ define double @f64libcalls(double %x, double %y, i32 %z) {
 ; CHECK-NEXT:  # %bb.0:
 ; CHECK-NEXT:    global.get $push12=, __stack_pointer
 ; CHECK-NEXT:    i32.const $push13=, 16
-; CHECK-NEXT:    i32.sub $push19=, $pop12, $pop13
-; CHECK-NEXT:    local.tee $push18=, 3, $pop19
-; CHECK-NEXT:    global.set __stack_pointer, $pop18
-; CHECK-NEXT:    local.get $push23=, 0
-; CHECK-NEXT:    local.get $push20=, 0
-; CHECK-NEXT:    call $push0=, tan, $pop20
+; CHECK-NEXT:    i32.sub $push21=, $pop12, $pop13
+; CHECK-NEXT:    local.tee $push20=, 3, $pop21
+; CHECK-NEXT:    global.set __stack_pointer, $pop20
+; CHECK-NEXT:    local.get $push25=, 0
+; CHECK-NEXT:    local.get $push22=, 0
+; CHECK-NEXT:    call $push0=, tan, $pop22
 ; CHECK-NEXT:    call $push1=, cos, $pop0
 ; CHECK-NEXT:    call $push2=, log10, $pop1
-; CHECK-NEXT:    local.get $push21=, 1
-; CHECK-NEXT:    call $push3=, pow, $pop2, $pop21
-; CHECK-NEXT:    local.get $push22=, 2
-; CHECK-NEXT:    call $push4=, __powidf2, $pop3, $pop22
+; CHECK-NEXT:    local.get $push23=, 1
+; CHECK-NEXT:    call $push3=, pow, $pop2, $pop23
+; CHECK-NEXT:    local.get $push24=, 2
+; CHECK-NEXT:    call $push4=, __powidf2, $pop3, $pop24
 ; CHECK-NEXT:    call $push5=, log, $pop4
 ; CHECK-NEXT:    call $push6=, exp, $pop5
 ; CHECK-NEXT:    call $push7=, exp10, $pop6
 ; CHECK-NEXT:    call $push8=, cbrt, $pop7
 ; CHECK-NEXT:    call $push9=, lround, $pop8
-; CHECK-NEXT:    call $push10=, ldexp, $pop23, $pop9
-; CHECK-NEXT:    local.get $push24=, 3
-; CHECK-NEXT:    i32.const $push16=, 12
-; CHECK-NEXT:    i32.add $push17=, $pop24, $pop16
-; CHECK-NEXT:    call $push25=, frexp, $pop10, $pop17
-; CHECK-NEXT:    local.set 0, $pop25
+; CHECK-NEXT:    call $push10=, ldexp, $pop25, $pop9
 ; CHECK-NEXT:    local.get $push26=, 3
-; CHECK-NEXT:    i32.load $push11=, 12($pop26)
+; CHECK-NEXT:    i32.const $push18=, 4
+; CHECK-NEXT:    i32.add $push19=, $pop26, $pop18
+; CHECK-NEXT:    call $push27=, frexp, $pop10, $pop19
+; CHECK-NEXT:    local.set 0, $pop27
+; CHECK-NEXT:    local.get $push28=, 3
+; CHECK-NEXT:    i32.load $push11=, 4($pop28)
 ; CHECK-NEXT:    call escape_value, $pop11
-; CHECK-NEXT:    local.get $push27=, 3
+; CHECK-NEXT:    local.get $push31=, 0
+; CHECK-NEXT:    local.get $push29=, 3
+; CHECK-NEXT:    i32.const $push16=, 8
+; CHECK-NEXT:    i32.add $push17=, $pop29, $pop16
+; CHECK-NEXT:    call $push30=, modf, $pop31, $pop17
+; CHECK-NEXT:    local.set 0, $pop30
+; CHECK-NEXT:    local.get $push32=, 3
 ; CHECK-NEXT:    i32.const $push14=, 16
-; CHECK-NEXT:    i32.add $push15=, $pop27, $pop14
+; CHECK-NEXT:    i32.add $push15=, $pop32, $pop14
 ; CHECK-NEXT:    global.set __stack_pointer, $pop15
-; CHECK-NEXT:    local.get $push28=, 0
-; CHECK-NEXT:    return $pop28
+; CHECK-NEXT:    local.get $push33=, 0
+; CHECK-NEXT:    return $pop33
 
 
  %k = call double @llvm.tan.f64(double %x)
@@ -251,8 +258,10 @@ define double @f64libcalls(double %x, double %y, i32 %z) {
  %result = call {double, i32} @llvm.frexp.f64.i32(double %j)
  %result.0 = extractvalue { double, i32 } %result, 0
  %result.1 = extractvalue { double, i32 } %result, 1
+ %resultModf = call {double, double} @llvm.modf.f64(double %result.0)
+ %resultModf.0 = extractvalue { double, double } %resultModf, 0
  call void @escape_value(i32 %result.1)
- ret double %result.0
+ ret double %resultModf.0
 }
 
 ; fcmp ord and unord (RTLIB::O_F32 / RTLIB::UO_F32 etc) are a special case (see