Mesa (master): gallivm: add create_builder_at_entry helper function

[Nicolai Hähnle]

Module: Mesa
Branch: master
Commit: 17e88e276ca5baeda4867713871219ebdf925d33
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=17e88e276ca5baeda4867713871219ebdf925d33

Author: Nicolai Hähnle <nicolai.haehnle at amd.com>
Date:   Tue Aug  9 12:23:41 2016 +0200

gallivm: add create_builder_at_entry helper function

Reduces code duplication.

Reviewed-by: Roland Scheidegger <sroland at vmware.com>
Reviewed-by: Marek Olšák <marek.olsak at amd.com>

---

 src/gallium/auxiliary/gallivm/lp_bld_flow.c | 45 ++++++++++++++---------------
 1 file changed, 22 insertions(+), 23 deletions(-)

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_flow.c b/src/gallium/auxiliary/gallivm/lp_bld_flow.c
index f3b3eab..9183f45 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_flow.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_flow.c
@@ -454,6 +454,26 @@ lp_build_endif(struct lp_build_if_state *ifthen)
 }
 
 
+static LLVMBuilderRef
+create_builder_at_entry(struct gallivm_state *gallivm)
+{
+   LLVMBuilderRef builder = gallivm->builder;
+   LLVMBasicBlockRef current_block = LLVMGetInsertBlock(builder);
+   LLVMValueRef function = LLVMGetBasicBlockParent(current_block);
+   LLVMBasicBlockRef first_block = LLVMGetEntryBasicBlock(function);
+   LLVMValueRef first_instr = LLVMGetFirstInstruction(first_block);
+   LLVMBuilderRef first_builder = LLVMCreateBuilderInContext(gallivm->context);
+
+   if (first_instr) {
+      LLVMPositionBuilderBefore(first_builder, first_instr);
+   } else {
+      LLVMPositionBuilderAtEnd(first_builder, first_block);
+   }
+
+   return first_builder;
+}
+
+
 /**
  * Allocate a scalar (or vector) variable.
  *
@@ -475,19 +495,9 @@ lp_build_alloca(struct gallivm_state *gallivm,
                 const char *name)
 {
    LLVMBuilderRef builder = gallivm->builder;
-   LLVMBasicBlockRef current_block = LLVMGetInsertBlock(builder);
-   LLVMValueRef function = LLVMGetBasicBlockParent(current_block);
-   LLVMBasicBlockRef first_block = LLVMGetEntryBasicBlock(function);
-   LLVMValueRef first_instr = LLVMGetFirstInstruction(first_block);
-   LLVMBuilderRef first_builder = LLVMCreateBuilderInContext(gallivm->context);
+   LLVMBuilderRef first_builder = create_builder_at_entry(gallivm);
    LLVMValueRef res;
 
-   if (first_instr) {
-      LLVMPositionBuilderBefore(first_builder, first_instr);
-   } else {
-      LLVMPositionBuilderAtEnd(first_builder, first_block);
-   }
-
    res = LLVMBuildAlloca(first_builder, type, name);
    LLVMBuildStore(builder, LLVMConstNull(type), res);
 
@@ -517,20 +527,9 @@ lp_build_array_alloca(struct gallivm_state *gallivm,
                       LLVMValueRef count,
                       const char *name)
 {
-   LLVMBuilderRef builder = gallivm->builder;
-   LLVMBasicBlockRef current_block = LLVMGetInsertBlock(builder);
-   LLVMValueRef function = LLVMGetBasicBlockParent(current_block);
-   LLVMBasicBlockRef first_block = LLVMGetEntryBasicBlock(function);
-   LLVMValueRef first_instr = LLVMGetFirstInstruction(first_block);
-   LLVMBuilderRef first_builder = LLVMCreateBuilderInContext(gallivm->context);
+   LLVMBuilderRef first_builder = create_builder_at_entry(gallivm);
    LLVMValueRef res;
 
-   if (first_instr) {
-      LLVMPositionBuilderBefore(first_builder, first_instr);
-   } else {
-      LLVMPositionBuilderAtEnd(first_builder, first_block);
-   }
-
    res = LLVMBuildArrayAlloca(first_builder, type, count, name);
 
    LLVMDisposeBuilder(first_builder);