[LoongArch] Suppress the unnecessary extensions for arguments in makeLibCall

Reviewed By: SixWeining, heiher

Pull Request: #92376

Author: wangleiat

llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp

@@ -4991,3 +4991,12 @@ bool LoongArchTargetLowering::shouldSignExtendTypeInLibCall(
 
   return IsSigned;
 }
+
+bool LoongArchTargetLowering::shouldExtendTypeInLibCall(EVT Type) const {
+  // Return false to suppress the unnecessary extensions if the LibCall
+  // arguments or return value is a float narrower than GRLEN on a soft FP ABI.
+  if (Subtarget.isSoftFPABI() && (Type.isFloatingPoint() && !Type.isVector() &&
+                                  Type.getSizeInBits() < Subtarget.getGRLen()))
+    return false;
+  return true;
+}

llvm/lib/Target/LoongArch/LoongArchISelLowering.h

@@ -240,6 +240,7 @@ class LoongArchTargetLowering : public TargetLowering {
   }
   bool shouldConsiderGEPOffsetSplit() const override { return true; }
   bool shouldSignExtendTypeInLibCall(EVT Type, bool IsSigned) const override;
+  bool shouldExtendTypeInLibCall(EVT Type) const override;
 
 private:
   /// Target-specific function used to lower LoongArch calling conventions.

llvm/lib/Target/LoongArch/LoongArchSubtarget.h

@@ -91,6 +91,10 @@ class LoongArchSubtarget : public LoongArchGenSubtargetInfo {
   MVT getGRLenVT() const { return GRLenVT; }
   unsigned getGRLen() const { return GRLen; }
   LoongArchABI::ABI getTargetABI() const { return TargetABI; }
+  bool isSoftFPABI() const {
+    return TargetABI == LoongArchABI::ABI_LP64S ||
+           TargetABI == LoongArchABI::ABI_ILP32S;
+  }
   bool isXRaySupported() const override { return is64Bit(); }
   Align getPrefFunctionAlignment() const { return PrefFunctionAlignment; }
   Align getPrefLoopAlignment() const { return PrefLoopAlignment; }

llvm/test/CodeGen/LoongArch/calling-conv-lp64s.ll

@@ -10,7 +10,7 @@ define i64 @callee_float_in_regs(i64 %a, float %b) nounwind {
 ; CHECK-NEXT:    st.d $ra, $sp, 8 # 8-byte Folded Spill
 ; CHECK-NEXT:    st.d $fp, $sp, 0 # 8-byte Folded Spill
 ; CHECK-NEXT:    move $fp, $a0
-; CHECK-NEXT:    addi.w $a0, $a1, 0
+; CHECK-NEXT:    move $a0, $a1
 ; CHECK-NEXT:    bl %plt(__fixsfdi)
 ; CHECK-NEXT:    add.d $a0, $fp, $a0
 ; CHECK-NEXT:    ld.d $fp, $sp, 0 # 8-byte Folded Reload

llvm/test/CodeGen/LoongArch/libcall-extend.ll

@@ -6,7 +6,7 @@ define signext i32 @convert_float_to_i32(i32 %tmp, float %a) nounwind {
 ; CHECK:       # %bb.0:
 ; CHECK-NEXT:    addi.d $sp, $sp, -16
 ; CHECK-NEXT:    st.d $ra, $sp, 8 # 8-byte Folded Spill
-; CHECK-NEXT:    bstrpick.d $a0, $a1, 31, 0
+; CHECK-NEXT:    move $a0, $a1
 ; CHECK-NEXT:    bl %plt(__fixsfsi)
 ; CHECK-NEXT:    ld.d $ra, $sp, 8 # 8-byte Folded Reload
 ; CHECK-NEXT:    addi.d $sp, $sp, 16

llvm/test/CodeGen/LoongArch/sextw-removal.ll

@@ -258,10 +258,9 @@ define void @test6(i32 signext %arg, i32 signext %arg1) nounwind {
 ; CHECK-NEXT:    addi.w $a0, $fp, 0
 ; CHECK-NEXT:    bl %plt(baz)
 ; CHECK-NEXT:    move $s0, $a0
-; CHECK-NEXT:    bstrpick.d $a0, $a0, 31, 0
 ; CHECK-NEXT:    bl %plt(__fixsfsi)
 ; CHECK-NEXT:    move $fp, $a0
-; CHECK-NEXT:    addi.w $a0, $s0, 0
+; CHECK-NEXT:    move $a0, $s0
 ; CHECK-NEXT:    move $a1, $zero
 ; CHECK-NEXT:    bl %plt(__nesf2)
 ; CHECK-NEXT:    bnez $a0, .LBB5_1
@@ -285,10 +284,9 @@ define void @test6(i32 signext %arg, i32 signext %arg1) nounwind {
 ; NORMV-NEXT:    addi.w $a0, $fp, 0
 ; NORMV-NEXT:    bl %plt(baz)
 ; NORMV-NEXT:    move $s0, $a0
-; NORMV-NEXT:    bstrpick.d $a0, $a0, 31, 0
 ; NORMV-NEXT:    bl %plt(__fixsfsi)
 ; NORMV-NEXT:    move $fp, $a0
-; NORMV-NEXT:    addi.w $a0, $s0, 0
+; NORMV-NEXT:    move $a0, $s0
 ; NORMV-NEXT:    move $a1, $zero
 ; NORMV-NEXT:    bl %plt(__nesf2)
 ; NORMV-NEXT:    bnez $a0, .LBB5_1
@@ -562,7 +560,6 @@ define void @test10(i32 signext %arg, i32 signext %arg1) nounwind {
 ; CHECK-NEXT:    addi.w $a0, $fp, 0
 ; CHECK-NEXT:    bl %plt(baz)
 ; CHECK-NEXT:    move $fp, $a0
-; CHECK-NEXT:    addi.w $a0, $a0, 0
 ; CHECK-NEXT:    move $a1, $zero
 ; CHECK-NEXT:    bl %plt(__nesf2)
 ; CHECK-NEXT:    bnez $a0, .LBB9_1
@@ -584,7 +581,6 @@ define void @test10(i32 signext %arg, i32 signext %arg1) nounwind {
 ; NORMV-NEXT:    addi.w $a0, $fp, 0
 ; NORMV-NEXT:    bl %plt(baz)
 ; NORMV-NEXT:    move $fp, $a0
-; NORMV-NEXT:    addi.w $a0, $a0, 0
 ; NORMV-NEXT:    move $a1, $zero
 ; NORMV-NEXT:    bl %plt(__nesf2)
 ; NORMV-NEXT:    bnez $a0, .LBB9_1

llvm/test/CodeGen/LoongArch/soft-fp-to-int.ll

@@ -69,7 +69,6 @@ define i32 @fptosi_i32_float(float %X) nounwind {
 ; LA64:       # %bb.0:
 ; LA64-NEXT:    addi.d $sp, $sp, -16
 ; LA64-NEXT:    st.d $ra, $sp, 8 # 8-byte Folded Spill
-; LA64-NEXT:    bstrpick.d $a0, $a0, 31, 0
 ; LA64-NEXT:    bl %plt(__fixsfsi)
 ; LA64-NEXT:    ld.d $ra, $sp, 8 # 8-byte Folded Reload
 ; LA64-NEXT:    addi.d $sp, $sp, 16
@@ -145,7 +144,6 @@ define i64 @fptosi_i64_float(float %X) nounwind {
 ; LA64:       # %bb.0:
 ; LA64-NEXT:    addi.d $sp, $sp, -16
 ; LA64-NEXT:    st.d $ra, $sp, 8 # 8-byte Folded Spill
-; LA64-NEXT:    addi.w $a0, $a0, 0
 ; LA64-NEXT:    bl %plt(__fixsfdi)
 ; LA64-NEXT:    ld.d $ra, $sp, 8 # 8-byte Folded Reload
 ; LA64-NEXT:    addi.d $sp, $sp, 16