[GlobalISel][X86_64] Support for G_FPTOSI

[aivchenk]

Summary

The instruction selection is automatically handled by tablegen

[igorb]

LGTM

llvm/trunk/lib/Target/X86/X86LegalizerInfo.cpp

void X86LegalizerInfo::setLegalizerInfo64bit() {
 
   getActionDefinitionsBuilder(G_SITOFP)
     .legalForCartesianProduct({s32, s64})
       .clampScalar(1, s32, s64)
       .widenScalarToNextPow2(1)
       .clampScalar(0, s32, s64)
       .widenScalarToNextPow2(0);
 
+  getActionDefinitionsBuilder(G_FPTOSI)
+      .legalForCartesianProduct({s32, s64})
+      .clampScalar(1, s32, s64)
+      .widenScalarToNextPow2(0)
+      .clampScalar(0, s32, s64)
+      .widenScalarToNextPow2(1);
+
   // Comparison
   setAction({G_ICMP, 1, s64}, Legal);
 
   getActionDefinitionsBuilder(G_FCMP)
       .legalForCartesianProduct({s8}, {s32, s64})
       .clampScalar(0, s8, s8)
       .clampScalar(1, s32, s64)
       .widenScalarToNextPow2(1);

llvm/trunk/lib/Target/X86/X86RegisterBankInfo.cpp

X86RegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
   SmallVector<PartialMappingIdx, 4> OpRegBankIdx(NumOperands);
 
   switch (Opc) {
   case TargetOpcode::G_FPEXT:
   case TargetOpcode::G_FCONSTANT:
     // Instruction having only floating-point operands (all scalars in VECRReg)
     getInstrPartialMappingIdxs(MI, MRI, /* isFP */ true, OpRegBankIdx);
     break;
-  case TargetOpcode::G_SITOFP: {
+  case TargetOpcode::G_SITOFP:
+  case TargetOpcode::G_FPTOSI: {
     // Some of the floating-point instructions have mixed GPR and FP operands:
     // fine-tune the computed mapping.
     auto &Op0 = MI.getOperand(0);
     auto &Op1 = MI.getOperand(1);
     const LLT Ty0 = MRI.getType(Op0.getReg());
     const LLT Ty1 = MRI.getType(Op1.getReg());
-    OpRegBankIdx[0] = getPartialMappingIdx(Ty0, /* isFP */ true);
-    OpRegBankIdx[1] = getPartialMappingIdx(Ty1, /* isFP */ false);
+
+    bool FirstArgIsFP = Opc == TargetOpcode::G_SITOFP;
+    bool SecondArgIsFP = Opc == TargetOpcode::G_FPTOSI;
+    OpRegBankIdx[0] = getPartialMappingIdx(Ty0, /* isFP */ FirstArgIsFP);
+    OpRegBankIdx[1] = getPartialMappingIdx(Ty1, /* isFP */ SecondArgIsFP);
     break;
   }
   case TargetOpcode::G_FCMP: {
     LLT Ty1 = MRI.getType(MI.getOperand(2).getReg());
     LLT Ty2 = MRI.getType(MI.getOperand(3).getReg());
     (void)Ty2;
     assert(Ty1.getSizeInBits() == Ty2.getSizeInBits() &&
            "Mismatched operand sizes for G_FCMP");

llvm/trunk/test/CodeGen/X86/GlobalISel/regbankselect-X86_64.mir

--- |
   }
 
   define double @int64_to_double(i64 %a) {
   entry:
     %conv = sitofp i64 %a to double
     ret double %conv
   }
 
+  define signext i8 @float_to_int8(float %val) {
+  entry:
+    %conv = fptosi float %val to i8
+    ret i8 %conv
+  }
+
+  define signext i16 @float_to_int16(float %val) {
+  entry:
+    %conv = fptosi float %val to i16
+    ret i16 %conv
+  }
+
+  define i32 @float_to_int32(float %val) {
+  entry:
+    %conv = fptosi float %val to i32
+    ret i32 %conv
+  }
+
+  define i64 @float_to_int64(float %val) {
+  entry:
+    %conv = fptosi float %val to i64
+    ret i64 %conv
+  }
+
+  define signext i8 @double_to_int8(double %val) {
+  entry:
+    %conv = fptosi double %val to i8
+    ret i8 %conv
+  }
+
+  define signext i16 @double_to_int16(double %val) {
+  entry:
+    %conv = fptosi double %val to i16
+    ret i16 %conv
+  }
+
+  define i32 @double_to_int32(double %val) {
+  entry:
+    %conv = fptosi double %val to i32
+    ret i32 %conv
+  }
+
+  define i64 @double_to_int64(double %val) {
+  entry:
+    %conv = fptosi double %val to i64
+    ret i64 %conv
+  }
+
   define i1 @fcmp_float_oeq(float %x, float %y) {
     %1 = fcmp oeq float %x, %y
     ret i1 %1
   }
 
   define i1 @fcmp_float_ogt(float %x, float %y) {
     %1 = fcmp ogt float %x, %y
     ret i1 %1
bb.1.entry:
     %0:_(s64) = COPY $rdi
     %1:_(s64) = G_SITOFP %0(s64)
     %2:_(s128) = G_ANYEXT %1(s64)
     $xmm0 = COPY %2(s128)
     RET 0, implicit $xmm0
 
 ...
 ---
+name:            float_to_int8
+alignment:       4
+legalized:       true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+  - { id: 3, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; FAST-LABEL: name: float_to_int8
+    ; FAST: liveins: $xmm0
+    ; FAST: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; FAST: [[TRUNC:%[0-9]+]]:vecr(s32) = G_TRUNC [[COPY]](s128)
+    ; FAST: [[FPTOSI:%[0-9]+]]:gpr(s32) = G_FPTOSI [[TRUNC]](s32)
+    ; FAST: [[TRUNC1:%[0-9]+]]:gpr(s8) = G_TRUNC [[FPTOSI]](s32)
+    ; FAST: $al = COPY [[TRUNC1]](s8)
+    ; FAST: RET 0, implicit $al
+    ; GREEDY-LABEL: name: float_to_int8
+    ; GREEDY: liveins: $xmm0
+    ; GREEDY: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; GREEDY: [[TRUNC:%[0-9]+]]:vecr(s32) = G_TRUNC [[COPY]](s128)
+    ; GREEDY: [[FPTOSI:%[0-9]+]]:gpr(s32) = G_FPTOSI [[TRUNC]](s32)
+    ; GREEDY: [[TRUNC1:%[0-9]+]]:gpr(s8) = G_TRUNC [[FPTOSI]](s32)
+    ; GREEDY: $al = COPY [[TRUNC1]](s8)
+    ; GREEDY: RET 0, implicit $al
+    %1:_(s128) = COPY $xmm0
+    %0:_(s32) = G_TRUNC %1(s128)
+    %3:_(s32) = G_FPTOSI %0(s32)
+    %2:_(s8) = G_TRUNC %3(s32)
+    $al = COPY %2(s8)
+    RET 0, implicit $al
+
+...
+---
+name:            float_to_int16
+alignment:       4
+legalized:       true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+  - { id: 3, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; FAST-LABEL: name: float_to_int16
+    ; FAST: liveins: $xmm0
+    ; FAST: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; FAST: [[TRUNC:%[0-9]+]]:vecr(s32) = G_TRUNC [[COPY]](s128)
+    ; FAST: [[FPTOSI:%[0-9]+]]:gpr(s32) = G_FPTOSI [[TRUNC]](s32)
+    ; FAST: [[TRUNC1:%[0-9]+]]:gpr(s16) = G_TRUNC [[FPTOSI]](s32)
+    ; FAST: $ax = COPY [[TRUNC1]](s16)
+    ; FAST: RET 0, implicit $ax
+    ; GREEDY-LABEL: name: float_to_int16
+    ; GREEDY: liveins: $xmm0
+    ; GREEDY: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; GREEDY: [[TRUNC:%[0-9]+]]:vecr(s32) = G_TRUNC [[COPY]](s128)
+    ; GREEDY: [[FPTOSI:%[0-9]+]]:gpr(s32) = G_FPTOSI [[TRUNC]](s32)
+    ; GREEDY: [[TRUNC1:%[0-9]+]]:gpr(s16) = G_TRUNC [[FPTOSI]](s32)
+    ; GREEDY: $ax = COPY [[TRUNC1]](s16)
+    ; GREEDY: RET 0, implicit $ax
+    %1:_(s128) = COPY $xmm0
+    %0:_(s32) = G_TRUNC %1(s128)
+    %3:_(s32) = G_FPTOSI %0(s32)
+    %2:_(s16) = G_TRUNC %3(s32)
+    $ax = COPY %2(s16)
+    RET 0, implicit $ax
+
+...
+---
+name:            float_to_int32
+alignment:       4
+legalized:       true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; FAST-LABEL: name: float_to_int32
+    ; FAST: liveins: $xmm0
+    ; FAST: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; FAST: [[TRUNC:%[0-9]+]]:vecr(s32) = G_TRUNC [[COPY]](s128)
+    ; FAST: [[FPTOSI:%[0-9]+]]:gpr(s32) = G_FPTOSI [[TRUNC]](s32)
+    ; FAST: $eax = COPY [[FPTOSI]](s32)
+    ; FAST: RET 0, implicit $eax
+    ; GREEDY-LABEL: name: float_to_int32
+    ; GREEDY: liveins: $xmm0
+    ; GREEDY: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; GREEDY: [[TRUNC:%[0-9]+]]:vecr(s32) = G_TRUNC [[COPY]](s128)
+    ; GREEDY: [[FPTOSI:%[0-9]+]]:gpr(s32) = G_FPTOSI [[TRUNC]](s32)
+    ; GREEDY: $eax = COPY [[FPTOSI]](s32)
+    ; GREEDY: RET 0, implicit $eax
+    %1:_(s128) = COPY $xmm0
+    %0:_(s32) = G_TRUNC %1(s128)
+    %2:_(s32) = G_FPTOSI %0(s32)
+    $eax = COPY %2(s32)
+    RET 0, implicit $eax
+
+...
+---
+name:            float_to_int64
+alignment:       4
+legalized:       true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; FAST-LABEL: name: float_to_int64
+    ; FAST: liveins: $xmm0
+    ; FAST: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; FAST: [[TRUNC:%[0-9]+]]:vecr(s32) = G_TRUNC [[COPY]](s128)
+    ; FAST: [[FPTOSI:%[0-9]+]]:gpr(s64) = G_FPTOSI [[TRUNC]](s32)
+    ; FAST: $rax = COPY [[FPTOSI]](s64)
+    ; FAST: RET 0, implicit $rax
+    ; GREEDY-LABEL: name: float_to_int64
+    ; GREEDY: liveins: $xmm0
+    ; GREEDY: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; GREEDY: [[TRUNC:%[0-9]+]]:vecr(s32) = G_TRUNC [[COPY]](s128)
+    ; GREEDY: [[FPTOSI:%[0-9]+]]:gpr(s64) = G_FPTOSI [[TRUNC]](s32)
+    ; GREEDY: $rax = COPY [[FPTOSI]](s64)
+    ; GREEDY: RET 0, implicit $rax
+    %1:_(s128) = COPY $xmm0
+    %0:_(s32) = G_TRUNC %1(s128)
+    %2:_(s64) = G_FPTOSI %0(s32)
+    $rax = COPY %2(s64)
+    RET 0, implicit $rax
+
+...
+---
+name:            double_to_int8
+alignment:       4
+legalized:       true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+  - { id: 3, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; FAST-LABEL: name: double_to_int8
+    ; FAST: liveins: $xmm0
+    ; FAST: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; FAST: [[TRUNC:%[0-9]+]]:vecr(s64) = G_TRUNC [[COPY]](s128)
+    ; FAST: [[FPTOSI:%[0-9]+]]:gpr(s32) = G_FPTOSI [[TRUNC]](s64)
+    ; FAST: [[TRUNC1:%[0-9]+]]:gpr(s8) = G_TRUNC [[FPTOSI]](s32)
+    ; FAST: $al = COPY [[TRUNC1]](s8)
+    ; FAST: RET 0, implicit $al
+    ; GREEDY-LABEL: name: double_to_int8
+    ; GREEDY: liveins: $xmm0
+    ; GREEDY: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; GREEDY: [[TRUNC:%[0-9]+]]:vecr(s64) = G_TRUNC [[COPY]](s128)
+    ; GREEDY: [[FPTOSI:%[0-9]+]]:gpr(s32) = G_FPTOSI [[TRUNC]](s64)
+    ; GREEDY: [[TRUNC1:%[0-9]+]]:gpr(s8) = G_TRUNC [[FPTOSI]](s32)
+    ; GREEDY: $al = COPY [[TRUNC1]](s8)
+    ; GREEDY: RET 0, implicit $al
+    %1:_(s128) = COPY $xmm0
+    %0:_(s64) = G_TRUNC %1(s128)
+    %3:_(s32) = G_FPTOSI %0(s64)
+    %2:_(s8) = G_TRUNC %3(s32)
+    $al = COPY %2(s8)
+    RET 0, implicit $al
+
+...
+---
+name:            double_to_int16
+alignment:       4
+legalized:       true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+  - { id: 3, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; FAST-LABEL: name: double_to_int16
+    ; FAST: liveins: $xmm0
+    ; FAST: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; FAST: [[TRUNC:%[0-9]+]]:vecr(s64) = G_TRUNC [[COPY]](s128)
+    ; FAST: [[FPTOSI:%[0-9]+]]:gpr(s32) = G_FPTOSI [[TRUNC]](s64)
+    ; FAST: [[TRUNC1:%[0-9]+]]:gpr(s16) = G_TRUNC [[FPTOSI]](s32)
+    ; FAST: $ax = COPY [[TRUNC1]](s16)
+    ; FAST: RET 0, implicit $ax
+    ; GREEDY-LABEL: name: double_to_int16
+    ; GREEDY: liveins: $xmm0
+    ; GREEDY: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; GREEDY: [[TRUNC:%[0-9]+]]:vecr(s64) = G_TRUNC [[COPY]](s128)
+    ; GREEDY: [[FPTOSI:%[0-9]+]]:gpr(s32) = G_FPTOSI [[TRUNC]](s64)
+    ; GREEDY: [[TRUNC1:%[0-9]+]]:gpr(s16) = G_TRUNC [[FPTOSI]](s32)
+    ; GREEDY: $ax = COPY [[TRUNC1]](s16)
+    ; GREEDY: RET 0, implicit $ax
+    %1:_(s128) = COPY $xmm0
+    %0:_(s64) = G_TRUNC %1(s128)
+    %3:_(s32) = G_FPTOSI %0(s64)
+    %2:_(s16) = G_TRUNC %3(s32)
+    $ax = COPY %2(s16)
+    RET 0, implicit $ax
+
+...
+---
+name:            double_to_int32
+alignment:       4
+legalized:       true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; FAST-LABEL: name: double_to_int32
+    ; FAST: liveins: $xmm0
+    ; FAST: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; FAST: [[TRUNC:%[0-9]+]]:vecr(s64) = G_TRUNC [[COPY]](s128)
+    ; FAST: [[FPTOSI:%[0-9]+]]:gpr(s32) = G_FPTOSI [[TRUNC]](s64)
+    ; FAST: $eax = COPY [[FPTOSI]](s32)
+    ; FAST: RET 0, implicit $eax
+    ; GREEDY-LABEL: name: double_to_int32
+    ; GREEDY: liveins: $xmm0
+    ; GREEDY: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; GREEDY: [[TRUNC:%[0-9]+]]:vecr(s64) = G_TRUNC [[COPY]](s128)
+    ; GREEDY: [[FPTOSI:%[0-9]+]]:gpr(s32) = G_FPTOSI [[TRUNC]](s64)
+    ; GREEDY: $eax = COPY [[FPTOSI]](s32)
+    ; GREEDY: RET 0, implicit $eax
+    %1:_(s128) = COPY $xmm0
+    %0:_(s64) = G_TRUNC %1(s128)
+    %2:_(s32) = G_FPTOSI %0(s64)
+    $eax = COPY %2(s32)
+    RET 0, implicit $eax
+
+...
+---
+name:            double_to_int64
+alignment:       4
+legalized:       true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; FAST-LABEL: name: double_to_int64
+    ; FAST: liveins: $xmm0
+    ; FAST: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; FAST: [[TRUNC:%[0-9]+]]:vecr(s64) = G_TRUNC [[COPY]](s128)
+    ; FAST: [[FPTOSI:%[0-9]+]]:gpr(s64) = G_FPTOSI [[TRUNC]](s64)
+    ; FAST: $rax = COPY [[FPTOSI]](s64)
+    ; FAST: RET 0, implicit $rax
+    ; GREEDY-LABEL: name: double_to_int64
+    ; GREEDY: liveins: $xmm0
+    ; GREEDY: [[COPY:%[0-9]+]]:vecr(s128) = COPY $xmm0
+    ; GREEDY: [[TRUNC:%[0-9]+]]:vecr(s64) = G_TRUNC [[COPY]](s128)
+    ; GREEDY: [[FPTOSI:%[0-9]+]]:gpr(s64) = G_FPTOSI [[TRUNC]](s64)
+    ; GREEDY: $rax = COPY [[FPTOSI]](s64)
+    ; GREEDY: RET 0, implicit $rax
+    %1:_(s128) = COPY $xmm0
+    %0:_(s64) = G_TRUNC %1(s128)
+    %2:_(s64) = G_FPTOSI %0(s64)
+    $rax = COPY %2(s64)
+    RET 0, implicit $rax
+
+...
+---
 name:            fcmp_float_oeq
 alignment:       4
 legalized:       true
 tracksRegLiveness: true
 registers:
   - { id: 0, class: _ }
   - { id: 1, class: _ }
   - { id: 2, class: _ }

llvm/trunk/test/CodeGen/X86/GlobalISel/x86_64-legalize-fptosi.mir

+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -mtriple=x86_64-linux-gnu -run-pass=legalizer -verify-machineinstrs %s -o - | FileCheck %s
+
+--- |
+
+  define signext i8 @float_to_int8(float %val) {
+  entry:
+    %conv = fptosi float %val to i8
+    ret i8 %conv
+  }
+
+  define signext i16 @float_to_int16(float %val) {
+  entry:
+    %conv = fptosi float %val to i16
+    ret i16 %conv
+  }
+
+  define i32 @float_to_int32(float %val) {
+  entry:
+    %conv = fptosi float %val to i32
+    ret i32 %conv
+  }
+
+  define i64 @float_to_int64(float %val) {
+  entry:
+    %conv = fptosi float %val to i64
+    ret i64 %conv
+  }
+
+  define signext i8 @double_to_int8(double %val) {
+  entry:
+    %conv = fptosi double %val to i8
+    ret i8 %conv
+  }
+
+  define signext i16 @double_to_int16(double %val) {
+  entry:
+    %conv = fptosi double %val to i16
+    ret i16 %conv
+  }
+
+  define i32 @double_to_int32(double %val) {
+  entry:
+    %conv = fptosi double %val to i32
+    ret i32 %conv
+  }
+
+  define i64 @double_to_int64(double %val) {
+  entry:
+    %conv = fptosi double %val to i64
+    ret i64 %conv
+  }
+
+...
+---
+name:            float_to_int8
+alignment:       4
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: float_to_int8
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:_(s128) = COPY $xmm0
+    ; CHECK: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[COPY]](s128)
+    ; CHECK: [[FPTOSI:%[0-9]+]]:_(s32) = G_FPTOSI [[TRUNC]](s32)
+    ; CHECK: [[TRUNC1:%[0-9]+]]:_(s8) = G_TRUNC [[FPTOSI]](s32)
+    ; CHECK: $al = COPY [[TRUNC1]](s8)
+    ; CHECK: RET 0, implicit $al
+    %1:_(s128) = COPY $xmm0
+    %0:_(s32) = G_TRUNC %1(s128)
+    %2:_(s8) = G_FPTOSI %0(s32)
+    $al = COPY %2(s8)
+    RET 0, implicit $al
+
+...
+---
+name:            float_to_int16
+alignment:       4
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: float_to_int16
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:_(s128) = COPY $xmm0
+    ; CHECK: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[COPY]](s128)
+    ; CHECK: [[FPTOSI:%[0-9]+]]:_(s32) = G_FPTOSI [[TRUNC]](s32)
+    ; CHECK: [[TRUNC1:%[0-9]+]]:_(s16) = G_TRUNC [[FPTOSI]](s32)
+    ; CHECK: $ax = COPY [[TRUNC1]](s16)
+    ; CHECK: RET 0, implicit $ax
+    %1:_(s128) = COPY $xmm0
+    %0:_(s32) = G_TRUNC %1(s128)
+    %2:_(s16) = G_FPTOSI %0(s32)
+    $ax = COPY %2(s16)
+    RET 0, implicit $ax
+
+...
+---
+name:            float_to_int32
+alignment:       4
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: float_to_int32
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:_(s128) = COPY $xmm0
+    ; CHECK: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[COPY]](s128)
+    ; CHECK: [[FPTOSI:%[0-9]+]]:_(s32) = G_FPTOSI [[TRUNC]](s32)
+    ; CHECK: $eax = COPY [[FPTOSI]](s32)
+    ; CHECK: RET 0, implicit $eax
+    %1:_(s128) = COPY $xmm0
+    %0:_(s32) = G_TRUNC %1(s128)
+    %2:_(s32) = G_FPTOSI %0(s32)
+    $eax = COPY %2(s32)
+    RET 0, implicit $eax
+
+...
+---
+name:            float_to_int64
+alignment:       4
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: float_to_int64
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:_(s128) = COPY $xmm0
+    ; CHECK: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[COPY]](s128)
+    ; CHECK: [[FPTOSI:%[0-9]+]]:_(s64) = G_FPTOSI [[TRUNC]](s32)
+    ; CHECK: $rax = COPY [[FPTOSI]](s64)
+    ; CHECK: RET 0, implicit $rax
+    %1:_(s128) = COPY $xmm0
+    %0:_(s32) = G_TRUNC %1(s128)
+    %2:_(s64) = G_FPTOSI %0(s32)
+    $rax = COPY %2(s64)
+    RET 0, implicit $rax
+
+...
+---
+name:            double_to_int8
+alignment:       4
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: double_to_int8
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:_(s128) = COPY $xmm0
+    ; CHECK: [[TRUNC:%[0-9]+]]:_(s64) = G_TRUNC [[COPY]](s128)
+    ; CHECK: [[FPTOSI:%[0-9]+]]:_(s32) = G_FPTOSI [[TRUNC]](s64)
+    ; CHECK: [[TRUNC1:%[0-9]+]]:_(s8) = G_TRUNC [[FPTOSI]](s32)
+    ; CHECK: $al = COPY [[TRUNC1]](s8)
+    ; CHECK: RET 0, implicit $al
+    %1:_(s128) = COPY $xmm0
+    %0:_(s64) = G_TRUNC %1(s128)
+    %2:_(s8) = G_FPTOSI %0(s64)
+    $al = COPY %2(s8)
+    RET 0, implicit $al
+
+...
+---
+name:            double_to_int16
+alignment:       4
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: double_to_int16
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:_(s128) = COPY $xmm0
+    ; CHECK: [[TRUNC:%[0-9]+]]:_(s64) = G_TRUNC [[COPY]](s128)
+    ; CHECK: [[FPTOSI:%[0-9]+]]:_(s32) = G_FPTOSI [[TRUNC]](s64)
+    ; CHECK: [[TRUNC1:%[0-9]+]]:_(s16) = G_TRUNC [[FPTOSI]](s32)
+    ; CHECK: $ax = COPY [[TRUNC1]](s16)
+    ; CHECK: RET 0, implicit $ax
+    %1:_(s128) = COPY $xmm0
+    %0:_(s64) = G_TRUNC %1(s128)
+    %2:_(s16) = G_FPTOSI %0(s64)
+    $ax = COPY %2(s16)
+    RET 0, implicit $ax
+
+...
+---
+name:            double_to_int32
+alignment:       4
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: double_to_int32
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:_(s128) = COPY $xmm0
+    ; CHECK: [[TRUNC:%[0-9]+]]:_(s64) = G_TRUNC [[COPY]](s128)
+    ; CHECK: [[FPTOSI:%[0-9]+]]:_(s32) = G_FPTOSI [[TRUNC]](s64)
+    ; CHECK: $eax = COPY [[FPTOSI]](s32)
+    ; CHECK: RET 0, implicit $eax
+    %1:_(s128) = COPY $xmm0
+    %0:_(s64) = G_TRUNC %1(s128)
+    %2:_(s32) = G_FPTOSI %0(s64)
+    $eax = COPY %2(s32)
+    RET 0, implicit $eax
+
+...
+---
+name:            double_to_int64
+alignment:       4
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: _ }
+  - { id: 1, class: _ }
+  - { id: 2, class: _ }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: double_to_int64
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:_(s128) = COPY $xmm0
+    ; CHECK: [[TRUNC:%[0-9]+]]:_(s64) = G_TRUNC [[COPY]](s128)
+    ; CHECK: [[FPTOSI:%[0-9]+]]:_(s64) = G_FPTOSI [[TRUNC]](s64)
+    ; CHECK: $rax = COPY [[FPTOSI]](s64)
+    ; CHECK: RET 0, implicit $rax
+    %1:_(s128) = COPY $xmm0
+    %0:_(s64) = G_TRUNC %1(s128)
+    %2:_(s64) = G_FPTOSI %0(s64)
+    $rax = COPY %2(s64)
+    RET 0, implicit $rax
+
+...

llvm/trunk/test/CodeGen/X86/GlobalISel/x86_64-select-fptosi.mir

+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
+# RUN: llc -mtriple=x86_64-linux-gnu -run-pass=instruction-select -verify-machineinstrs %s -o - | FileCheck %s
+
+--- |
+
+  define signext i8 @float_to_int8(float %val) {
+  entry:
+    %conv = fptosi float %val to i8
+    ret i8 %conv
+  }
+
+  define signext i16 @float_to_int16(float %val) {
+  entry:
+    %conv = fptosi float %val to i16
+    ret i16 %conv
+  }
+
+  define i32 @float_to_int32(float %val) {
+  entry:
+    %conv = fptosi float %val to i32
+    ret i32 %conv
+  }
+
+  define i64 @float_to_int64(float %val) {
+  entry:
+    %conv = fptosi float %val to i64
+    ret i64 %conv
+  }
+
+  define signext i8 @double_to_int8(double %val) {
+  entry:
+    %conv = fptosi double %val to i8
+    ret i8 %conv
+  }
+
+  define signext i16 @double_to_int16(double %val) {
+  entry:
+    %conv = fptosi double %val to i16
+    ret i16 %conv
+  }
+
+  define i32 @double_to_int32(double %val) {
+  entry:
+    %conv = fptosi double %val to i32
+    ret i32 %conv
+  }
+
+  define i64 @double_to_int64(double %val) {
+  entry:
+    %conv = fptosi double %val to i64
+    ret i64 %conv
+  }
+
+...
+---
+name:            float_to_int8
+alignment:       4
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: vecr }
+  - { id: 1, class: vecr }
+  - { id: 2, class: gpr }
+  - { id: 3, class: gpr }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: float_to_int8
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:vr128 = COPY $xmm0
+    ; CHECK: [[COPY1:%[0-9]+]]:fr32 = COPY [[COPY]]
+    ; CHECK: [[CVTTSS2SIrr:%[0-9]+]]:gr32 = CVTTSS2SIrr [[COPY1]]
+    ; CHECK: [[COPY2:%[0-9]+]]:gr8 = COPY [[CVTTSS2SIrr]].sub_8bit
+    ; CHECK: $al = COPY [[COPY2]]
+    ; CHECK: RET 0, implicit $al
+    %1:vecr(s128) = COPY $xmm0
+    %0:vecr(s32) = G_TRUNC %1(s128)
+    %3:gpr(s32) = G_FPTOSI %0(s32)
+    %2:gpr(s8) = G_TRUNC %3(s32)
+    $al = COPY %2(s8)
+    RET 0, implicit $al
+
+...
+---
+name:            float_to_int16
+alignment:       4
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: vecr }
+  - { id: 1, class: vecr }
+  - { id: 2, class: gpr }
+  - { id: 3, class: gpr }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: float_to_int16
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:vr128 = COPY $xmm0
+    ; CHECK: [[COPY1:%[0-9]+]]:fr32 = COPY [[COPY]]
+    ; CHECK: [[CVTTSS2SIrr:%[0-9]+]]:gr32 = CVTTSS2SIrr [[COPY1]]
+    ; CHECK: [[COPY2:%[0-9]+]]:gr16 = COPY [[CVTTSS2SIrr]].sub_16bit
+    ; CHECK: $ax = COPY [[COPY2]]
+    ; CHECK: RET 0, implicit $ax
+    %1:vecr(s128) = COPY $xmm0
+    %0:vecr(s32) = G_TRUNC %1(s128)
+    %3:gpr(s32) = G_FPTOSI %0(s32)
+    %2:gpr(s16) = G_TRUNC %3(s32)
+    $ax = COPY %2(s16)
+    RET 0, implicit $ax
+
+...
+---
+name:            float_to_int32
+alignment:       4
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: vecr }
+  - { id: 1, class: vecr }
+  - { id: 2, class: gpr }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: float_to_int32
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:vr128 = COPY $xmm0
+    ; CHECK: [[COPY1:%[0-9]+]]:fr32 = COPY [[COPY]]
+    ; CHECK: [[CVTTSS2SIrr:%[0-9]+]]:gr32 = CVTTSS2SIrr [[COPY1]]
+    ; CHECK: $eax = COPY [[CVTTSS2SIrr]]
+    ; CHECK: RET 0, implicit $eax
+    %1:vecr(s128) = COPY $xmm0
+    %0:vecr(s32) = G_TRUNC %1(s128)
+    %2:gpr(s32) = G_FPTOSI %0(s32)
+    $eax = COPY %2(s32)
+    RET 0, implicit $eax
+
+...
+---
+name:            float_to_int64
+alignment:       4
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: vecr }
+  - { id: 1, class: vecr }
+  - { id: 2, class: gpr }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: float_to_int64
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:vr128 = COPY $xmm0
+    ; CHECK: [[COPY1:%[0-9]+]]:fr32 = COPY [[COPY]]
+    ; CHECK: [[CVTTSS2SI64rr:%[0-9]+]]:gr64 = CVTTSS2SI64rr [[COPY1]]
+    ; CHECK: $rax = COPY [[CVTTSS2SI64rr]]
+    ; CHECK: RET 0, implicit $rax
+    %1:vecr(s128) = COPY $xmm0
+    %0:vecr(s32) = G_TRUNC %1(s128)
+    %2:gpr(s64) = G_FPTOSI %0(s32)
+    $rax = COPY %2(s64)
+    RET 0, implicit $rax
+
+...
+---
+name:            double_to_int8
+alignment:       4
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: vecr }
+  - { id: 1, class: vecr }
+  - { id: 2, class: gpr }
+  - { id: 3, class: gpr }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: double_to_int8
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:vr128 = COPY $xmm0
+    ; CHECK: [[COPY1:%[0-9]+]]:fr64 = COPY [[COPY]]
+    ; CHECK: [[CVTTSD2SIrr:%[0-9]+]]:gr32 = CVTTSD2SIrr [[COPY1]]
+    ; CHECK: [[COPY2:%[0-9]+]]:gr8 = COPY [[CVTTSD2SIrr]].sub_8bit
+    ; CHECK: $al = COPY [[COPY2]]
+    ; CHECK: RET 0, implicit $al
+    %1:vecr(s128) = COPY $xmm0
+    %0:vecr(s64) = G_TRUNC %1(s128)
+    %3:gpr(s32) = G_FPTOSI %0(s64)
+    %2:gpr(s8) = G_TRUNC %3(s32)
+    $al = COPY %2(s8)
+    RET 0, implicit $al
+
+...
+---
+name:            double_to_int16
+alignment:       4
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: vecr }
+  - { id: 1, class: vecr }
+  - { id: 2, class: gpr }
+  - { id: 3, class: gpr }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: double_to_int16
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:vr128 = COPY $xmm0
+    ; CHECK: [[COPY1:%[0-9]+]]:fr64 = COPY [[COPY]]
+    ; CHECK: [[CVTTSD2SIrr:%[0-9]+]]:gr32 = CVTTSD2SIrr [[COPY1]]
+    ; CHECK: [[COPY2:%[0-9]+]]:gr16 = COPY [[CVTTSD2SIrr]].sub_16bit
+    ; CHECK: $ax = COPY [[COPY2]]
+    ; CHECK: RET 0, implicit $ax
+    %1:vecr(s128) = COPY $xmm0
+    %0:vecr(s64) = G_TRUNC %1(s128)
+    %3:gpr(s32) = G_FPTOSI %0(s64)
+    %2:gpr(s16) = G_TRUNC %3(s32)
+    $ax = COPY %2(s16)
+    RET 0, implicit $ax
+
+...
+---
+name:            double_to_int32
+alignment:       4
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: vecr }
+  - { id: 1, class: vecr }
+  - { id: 2, class: gpr }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: double_to_int32
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:vr128 = COPY $xmm0
+    ; CHECK: [[COPY1:%[0-9]+]]:fr64 = COPY [[COPY]]
+    ; CHECK: [[CVTTSD2SIrr:%[0-9]+]]:gr32 = CVTTSD2SIrr [[COPY1]]
+    ; CHECK: $eax = COPY [[CVTTSD2SIrr]]
+    ; CHECK: RET 0, implicit $eax
+    %1:vecr(s128) = COPY $xmm0
+    %0:vecr(s64) = G_TRUNC %1(s128)
+    %2:gpr(s32) = G_FPTOSI %0(s64)
+    $eax = COPY %2(s32)
+    RET 0, implicit $eax
+
+...
+---
+name:            double_to_int64
+alignment:       4
+legalized:       true
+regBankSelected: true
+tracksRegLiveness: true
+registers:
+  - { id: 0, class: vecr }
+  - { id: 1, class: vecr }
+  - { id: 2, class: gpr }
+body:             |
+  bb.1.entry:
+    liveins: $xmm0
+
+    ; CHECK-LABEL: name: double_to_int64
+    ; CHECK: liveins: $xmm0
+    ; CHECK: [[COPY:%[0-9]+]]:vr128 = COPY $xmm0
+    ; CHECK: [[COPY1:%[0-9]+]]:fr64 = COPY [[COPY]]
+    ; CHECK: [[CVTTSD2SI64rr:%[0-9]+]]:gr64 = CVTTSD2SI64rr [[COPY1]]
+    ; CHECK: $rax = COPY [[CVTTSD2SI64rr]]
+    ; CHECK: RET 0, implicit $rax
+    %1:vecr(s128) = COPY $xmm0
+    %0:vecr(s64) = G_TRUNC %1(s128)
+    %2:gpr(s64) = G_FPTOSI %0(s64)
+    $rax = COPY %2(s64)
+    RET 0, implicit $rax
+
+...