Mesa (master): ac/nir: fix nir_op_b2f16

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Module: Mesa
Branch: master
Commit: bc6d486c78a43ab86aecf68e095620d72edc135e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=bc6d486c78a43ab86aecf68e095620d72edc135e

Author: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Date:   Mon Apr  8 09:24:56 2019 +0200

ac/nir: fix nir_op_b2f16

Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas at basnieuwenhuizen.nl>

---

 src/amd/common/ac_nir_to_llvm.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index f2d527540d8..3d2f738edec 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -322,10 +322,16 @@ static LLVMValueRef emit_b2f(struct ac_llvm_context *ctx,
 					   "");
 	result = LLVMBuildBitCast(ctx->builder, result, ctx->f32, "");
 
-	if (bitsize == 32)
+	switch (bitsize) {
+	case 16:
+		return LLVMBuildFPTrunc(ctx->builder, result, ctx->f16, "");
+	case 32:
 		return result;
-
-	return LLVMBuildFPExt(ctx->builder, result, ctx->f64, "");
+	case 64:
+		return LLVMBuildFPExt(ctx->builder, result, ctx->f64, "");
+	default:
+		unreachable("Unsupported bit size.");
+	}
 }
 
 static LLVMValueRef emit_f2b(struct ac_llvm_context *ctx,