[SPIRV] support for the intrinsic @llvm.fptosi.sat.* and @llvm.fptoui.sat.* (#129222)

Add support for the intrinsic @llvm.fptosi.sat.* and @llvm.fptoui.sat.*
- add legalizer for G_FPTOSI_SAT and G_FPTOUI_SAT
- add instructionSelector for G_FPTOSI_SAT and G_FPTOUI_SAT
- add function to add saturatedConversion decoration to the intrinsic

---------

Co-authored-by: Dmitry Sidorov <dmitry.sidorov@intel.com>
Co-authored-by: Ebin-McW <ebin.jose@multicorewareinc.com>
Co-authored-by: Michal Paszkowski <michal@michalpaszkowski.com>

4 files changed, 224 insertions, 0 deletions

diff --git a/llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp b/llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp
index 947b574..9f55330 100644
--- a/llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVEmitIntrinsics.cpp
@@ -1458,6 +1458,24 @@ static void createSaturatedConversionDecoration(Instruction *I,
   createDecorationIntrinsic(I, SaturatedConversionNode, B);
 }
 
+static void addSaturatedDecorationToIntrinsic(Instruction *I, IRBuilder<> &B) {
+  if (auto *CI = dyn_cast<CallInst>(I)) {
+    if (Function *Fu = CI->getCalledFunction()) {
+      if (Fu->isIntrinsic()) {
+        unsigned const int IntrinsicId = Fu->getIntrinsicID();
+        switch (IntrinsicId) {
+        case Intrinsic::fptosi_sat:
+        case Intrinsic::fptoui_sat:
+          createSaturatedConversionDecoration(I, B);
+          break;
+        default:
+          break;
+        }
+      }
+    }
+  }
+}
+
 Instruction *SPIRVEmitIntrinsics::visitCallInst(CallInst &Call) {
   if (!Call.isInlineAsm())
     return &Call;
@@ -2640,6 +2658,7 @@ bool SPIRVEmitIntrinsics::runOnFunction(Function &Func) {
     if (isConvergenceIntrinsic(I))
       continue;
 
+    addSaturatedDecorationToIntrinsic(I, B);
     processInstrAfterVisit(I, B);
   }
 
diff --git a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
index d4fa62a..e9f5ffa 100644
--- a/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
@@ -665,6 +665,11 @@ bool SPIRVInstructionSelector::spvSelect(Register ResVReg,
   case TargetOpcode::G_FPTOUI:
     return selectUnOp(ResVReg, ResType, I, SPIRV::OpConvertFToU);
 
+  case TargetOpcode::G_FPTOSI_SAT:
+    return selectUnOp(ResVReg, ResType, I, SPIRV::OpConvertFToS);
+  case TargetOpcode::G_FPTOUI_SAT:
+    return selectUnOp(ResVReg, ResType, I, SPIRV::OpConvertFToU);
+
   case TargetOpcode::G_SITOFP:
     return selectIToF(ResVReg, ResType, I, true, SPIRV::OpConvertSToF);
   case TargetOpcode::G_UITOFP:
diff --git a/llvm/lib/Target/SPIRV/SPIRVLegalizerInfo.cpp b/llvm/lib/Target/SPIRV/SPIRVLegalizerInfo.cpp
index 1995e0f..170bddd 100644
--- a/llvm/lib/Target/SPIRV/SPIRVLegalizerInfo.cpp
+++ b/llvm/lib/Target/SPIRV/SPIRVLegalizerInfo.cpp
@@ -203,6 +203,10 @@ SPIRVLegalizerInfo::SPIRVLegalizerInfo(const SPIRVSubtarget &ST) {
       .legalForCartesianProduct(allIntScalarsAndVectors,
                                 allFloatScalarsAndVectors);
 
+  getActionDefinitionsBuilder({G_FPTOSI_SAT, G_FPTOUI_SAT})
+      .legalForCartesianProduct(allIntScalarsAndVectors,
+                                allFloatScalarsAndVectors);
+
   getActionDefinitionsBuilder({G_SITOFP, G_UITOFP})
       .legalForCartesianProduct(allFloatScalarsAndVectors,
                                 allScalarsAndVectors);
diff --git a/llvm/test/CodeGen/SPIRV/llvm-intrinsics/fp-to-int-intrinsics.ll b/llvm/test/CodeGen/SPIRV/llvm-intrinsics/fp-to-int-intrinsics.ll
new file mode 100644
index 0000000..66c744f
--- /dev/null
+++ b/llvm/test/CodeGen/SPIRV/llvm-intrinsics/fp-to-int-intrinsics.ll
@@ -0,0 +1,196 @@
+; RUN: llc -O0 -verify-machineinstrs -mtriple=spirv64-unkown-unknown %s -o - | FileCheck %s
+; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv64-unkown-unknown %s -o - -filetype=obj | spirv-val %}
+ 
+; CHECK: OpDecorate %[[#SAT1:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT2:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT3:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT4:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT5:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT6:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT7:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT8:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT9:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT10:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT11:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT12:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT13:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT14:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT15:]] SaturatedConversion
+; CHECK: OpDecorate %[[#SAT16:]] SaturatedConversion
+ 
+
+; CHECK: %[[#SAT1]] = OpConvertFToS %[[#]] %[[#]]
+define spir_kernel void @testfunction_float_to_signed_i8(float %input) {
+entry:
+   %ptr = alloca i8
+   %signed_int = call i8 @llvm.fptosi.sat.i8.f32(float %input)
+   store i8 %signed_int, i8* %ptr
+   ret void
+
+}
+declare i8 @llvm.fptosi.sat.i8.f32(float)
+ 
+ 
+; CHECK: %[[#SAT2]] = OpConvertFToS %[[#]] %[[#]]
+define spir_kernel void @testfunction_float_to_signed_i16(float %input) {
+entry:
+   %ptr = alloca i16
+   %signed_int = call i16 @llvm.fptosi.sat.i16.f32(float %input)
+   store i16 %signed_int, i16* %ptr
+   ret void
+
+}
+declare i16 @llvm.fptosi.sat.i16.f32(float)
+ 
+; CHECK: %[[#SAT3]] = OpConvertFToS %[[#]] %[[#]]
+define spir_kernel void @testfunction_float_to_signed_i32(float %input) {
+entry:
+   %ptr = alloca i32
+   %signed_int = call i32 @llvm.fptosi.sat.i32.f32(float %input)
+   store i32 %signed_int, i32* %ptr
+   ret void
+
+}
+declare i32 @llvm.fptosi.sat.i32.f32(float)
+ 
+
+; CHECK: %[[#SAT4]] = OpConvertFToS %[[#]] %[[#]]
+define spir_kernel void @testfunction_float_to_signed_i64(float %input) {
+entry:
+   %ptr = alloca i64
+   %signed_int = call i64 @llvm.fptosi.sat.i64.f32(float %input)
+   store i64 %signed_int, i64* %ptr
+   ret void
+}
+declare i64 @llvm.fptosi.sat.i64.f32(float)
+ 
+
+; CHECK: %[[#SAT5]] = OpConvertFToS %[[#]] %[[#]]
+define spir_kernel void @testfunction_double_to_signed_i8(double %input) {
+entry:
+   %ptr = alloca i8
+   %signed_int = call i8 @llvm.fptosi.sat.i8.f64(double %input)
+   store i8 %signed_int, i8* %ptr
+   ret void
+}
+declare i8 @llvm.fptosi.sat.i8.f64(double)
+ 
+
+; CHECK: %[[#SAT6]] = OpConvertFToS %[[#]] %[[#]]
+define spir_kernel void @testfunction_double_to_signed_i16(double %input) {
+entry:
+   %ptr = alloca i16
+   %signed_int = call i16 @llvm.fptosi.sat.i16.f64(double %input)
+   store i16 %signed_int, i16* %ptr
+   ret void
+}
+declare i16 @llvm.fptosi.sat.i16.f64(double)
+ 
+ 
+; CHECK: %[[#SAT7]] = OpConvertFToS %[[#]] %[[#]]
+define spir_kernel void @testfunction_double_to_signed_i32(double %input) {
+entry:
+   %ptr = alloca i32
+   %signed_int = call i32 @llvm.fptosi.sat.i32.f64(double %input)
+   store i32 %signed_int, i32* %ptr
+   ret void
+}
+declare i32 @llvm.fptosi.sat.i32.f64(double)
+ 
+ 
+; CHECK: %[[#SAT8]] = OpConvertFToS %[[#]] %[[#]]
+define spir_kernel void @testfunction_double_to_signed_i64(double %input) {
+entry:
+   %ptr = alloca i64
+   %signed_int = call i64 @llvm.fptosi.sat.i64.f64(double %input)
+   store i64 %signed_int, i64* %ptr
+   ret void
+}
+declare i64 @llvm.fptosi.sat.i64.f64(double)
+ 
+; CHECK: %[[#SAT9]] = OpConvertFToU %[[#]] %[[#]]
+define spir_kernel void @testfunction_float_to_unsigned_i8(float %input) {
+entry:
+   %ptr = alloca i8
+   %unsigned_int = call i8 @llvm.fptoui.sat.i8.f32(float %input)
+   store i8 %unsigned_int, i8* %ptr
+   ret void
+}
+declare i8 @llvm.fptoui.sat.i8.f32(float)
+ 
+
+; CHECK: %[[#SAT10]] = OpConvertFToU %[[#]] %[[#]]
+define spir_kernel void @testfunction_float_to_unsigned_i16(float %input) {
+entry:
+   %ptr = alloca i16
+   %unsigned_int = call i16 @llvm.fptoui.sat.i16.f32(float %input)
+   store i16 %unsigned_int, i16* %ptr
+   ret void
+}
+declare i16 @llvm.fptoui.sat.i16.f32(float)
+
+
+; CHECK: %[[#SAT11]] = OpConvertFToU %[[#]] %[[#]]
+define spir_kernel void @testfunction_float_to_unsigned_i32(float %input) {
+entry:
+   %ptr = alloca i32
+   %unsigned_int = call i32 @llvm.fptoui.sat.i32.f32(float %input)
+   store i32 %unsigned_int, i32* %ptr
+   ret void
+}
+declare i32 @llvm.fptoui.sat.i32.f32(float)
+ 
+
+; CHECK: %[[#SAT12]] = OpConvertFToU %[[#]] %[[#]]
+define spir_kernel void @testfunction_float_to_unsigned_i64(float %input) {
+entry:
+   %ptr = alloca i64
+   %unsigned_int = call i64 @llvm.fptoui.sat.i64.f32(float %input)
+   store i64 %unsigned_int, i64* %ptr
+   ret void
+}
+declare i64 @llvm.fptoui.sat.i64.f32(float)
+ 
+
+; CHECK: %[[#SAT13]] = OpConvertFToU %[[#]] %[[#]]
+define spir_kernel void @testfunction_double_to_unsigned_i8(double %input) {
+entry:
+   %ptr = alloca i8
+   %unsigned_int = call i8 @llvm.fptoui.sat.i8.f64(double %input)
+   store i8 %unsigned_int, i8* %ptr
+   ret void
+}
+declare i8 @llvm.fptoui.sat.i8.f64(double)
+ 
+
+; CHECK: %[[#SAT14]] = OpConvertFToU %[[#]] %[[#]]
+define spir_kernel void @testfunction_double_to_unsigned_i16(double %input) {
+entry:
+   %ptr = alloca i16
+   %unsigned_int = call i16 @llvm.fptoui.sat.i16.f64(double %input)
+   store i16 %unsigned_int, i16* %ptr
+   ret void
+}
+declare i16 @llvm.fptoui.sat.i16.f64(double)
+ 
+
+; CHECK: %[[#SAT15]] = OpConvertFToU %[[#]] %[[#]]
+define spir_kernel void @testfunction_double_to_unsigned_i32(double %input) {
+entry:
+   %ptr = alloca i32
+   %unsigned_int = call i32 @llvm.fptoui.sat.i32.f64(double %input)
+   store i32 %unsigned_int, i32* %ptr
+   ret void
+}
+declare i32 @llvm.fptoui.sat.i32.f64(double)
+ 
+
+; CHECK: %[[#SAT16]] = OpConvertFToU %[[#]] %[[#]]
+define spir_kernel void @testfunction_double_to_unsigned_i64(double %input) {
+entry:
+   %ptr = alloca i64
+   %unsigned_int = call i64 @llvm.fptoui.sat.i64.f64(double %input)
+   store i64 %unsigned_int, i64* %ptr
+   ret void
+}
+declare i64 @llvm.fptoui.sat.i64.f64(double)