[clang] [RISCV] Use FP type as the base type for some int->f conversions. (PR #101733)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-risc-v

Author: Craig Topper (topperc)

<details>
<summary>Changes</summary>

This is an alternative to part of #<!-- -->101608. Using FP as the base type allows the existing Zfh extension check to work.

This does not fix fp->int narrowing instructions which still use the narrow integer type as their base type.

---
Full diff: https://github.com/llvm/llvm-project/pull/101733.diff


1 Files Affected:

- (modified) clang/include/clang/Basic/riscv_vector.td (+8-8) 


``````````diff
diff --git a/clang/include/clang/Basic/riscv_vector.td b/clang/include/clang/Basic/riscv_vector.td
index 4841792c91d4a..0cab4b8067f0d 100644
--- a/clang/include/clang/Basic/riscv_vector.td
+++ b/clang/include/clang/Basic/riscv_vector.td
@@ -1987,9 +1987,9 @@ let ManualCodegen = [{
         RVVConvBuiltinSet<"vfcvt_xu_f_v", "xfd", [["Uv", "Uvvu"]]>;
     let OverloadedName = "vfcvt_f" in {
       defm :
-        RVVConvBuiltinSet<"vfcvt_f_x_v", "sil", [["Fv", "Fvvu"]]>;
+        RVVConvBuiltinSet<"vfcvt_f_x_v", "xfd", [["v", "vIvu"]]>;
       defm :
-        RVVConvBuiltinSet<"vfcvt_f_xu_v", "sil", [["Fv", "FvUvu"]]>;
+        RVVConvBuiltinSet<"vfcvt_f_xu_v", "xfd", [["v", "vUvu"]]>;
     }
 
     // 13.18. Widening Floating-Point/Integer Type-Convert Instructions
@@ -2011,9 +2011,9 @@ let ManualCodegen = [{
           RVVConvBuiltinSet<"vfncvt_xu_f_w", "csi", [["Uv", "UvFwu"]]>;
       let OverloadedName = "vfncvt_f" in {
         defm :
-          RVVConvBuiltinSet<"vfncvt_f_x_w", "si", [["Fv", "Fvwu"]]>;
+          RVVConvBuiltinSet<"vfncvt_f_x_w", "xf", [["v", "vIwu"]]>;
         defm :
-          RVVConvBuiltinSet<"vfncvt_f_xu_w", "si", [["Fv", "FvUwu"]]>;
+          RVVConvBuiltinSet<"vfncvt_f_xu_w", "xf", [["v", "vUwu"]]>;
       }
       let OverloadedName = "vfncvt_f" in {
         defm : RVVConvBuiltinSet<"vfncvt_f_f_w", "f", [["v", "vwu"]]>;
@@ -2037,9 +2037,9 @@ let ManualCodegen = [{
       RVVConvBuiltinSet<"vfcvt_xu_f_v", "xfd", [["Uv", "Uvv"]]>;
   let OverloadedName = "vfcvt_f" in {
     defm :
-      RVVConvBuiltinSet<"vfcvt_f_x_v", "sil", [["Fv", "Fvv"]]>;
+      RVVConvBuiltinSet<"vfcvt_f_x_v", "xfd", [["v", "vIv"]]>;
     defm :
-      RVVConvBuiltinSet<"vfcvt_f_xu_v", "sil", [["Fv", "FvUv"]]>;
+      RVVConvBuiltinSet<"vfcvt_f_xu_v", "xfd", [["v", "vUv"]]>;
   }
 
   // 13.18. Widening Floating-Point/Integer Type-Convert Instructions
@@ -2061,9 +2061,9 @@ let ManualCodegen = [{
         RVVConvBuiltinSet<"vfncvt_xu_f_w", "csi", [["Uv", "UvFw"]]>;
     let OverloadedName = "vfncvt_f" in {
       defm :
-        RVVConvBuiltinSet<"vfncvt_f_x_w", "si", [["Fv", "Fvw"]]>;
+        RVVConvBuiltinSet<"vfncvt_f_x_w", "xf", [["v", "vIw"]]>;
       defm :
-        RVVConvBuiltinSet<"vfncvt_f_xu_w", "si", [["Fv", "FvUw"]]>;
+        RVVConvBuiltinSet<"vfncvt_f_xu_w", "xf", [["v", "vUw"]]>;
     }
     let OverloadedName = "vfncvt_f" in {
       defm : RVVConvBuiltinSet<"vfncvt_f_f_w", "f", [["v", "vw"]]>;

``````````

</details>


https://github.com/llvm/llvm-project/pull/101733