From 7002c94a63c58aa0ac5a5d74b1fffd1511aeb699 Mon Sep 17 00:00:00 2001
From: gingerBill <bill@gingerbill.org>
Date: Wed, 25 May 2022 23:34:41 +0100
Subject: Add `intrinsics.simd_select`

---
 src/llvm_backend_proc.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'src/llvm_backend_proc.cpp')

diff --git a/src/llvm_backend_proc.cpp b/src/llvm_backend_proc.cpp
index 1b5d15d9b..7a86427d4 100644
--- a/src/llvm_backend_proc.cpp
+++ b/src/llvm_backend_proc.cpp
@@ -1296,6 +1296,18 @@ lbValue lb_build_builtin_simd_proc(lbProcedure *p, Ast *expr, TypeAndValue const
 			res.value = LLVMBuildShuffleVector(p->builder, arg0.value, arg1.value, mask, "");
 			return res;
 		}
+
+	case BuiltinProc_simd_select:
+		{
+			LLVMValueRef cond = arg0.value;
+			LLVMValueRef x = lb_build_expr(p, ce->args[1]).value;
+			LLVMValueRef y = lb_build_expr(p, ce->args[2]).value;
+
+			cond = LLVMBuildICmp(p->builder, LLVMIntNE, cond, LLVMConstNull(LLVMTypeOf(cond)), "");
+			res.value = LLVMBuildSelect(p->builder, cond, x, y, "");
+			return res;
+		}
+
 	}
 	GB_PANIC("Unhandled simd intrinsic: '%.*s'", LIT(builtin_procs[builtin_id].name));
 
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