Fix emit logic for getElementPtr. (#4362)

* Fix emit logic for getElementPtr.

* Legalize  `getElementPtr(vector, id)` for metal.

* Fix compiler error.

* Fix warnings.

* Fix test.

* Fix.

1 files changed, 24 insertions, 0 deletions

diff --git a/tests/metal/vector-get-element-ptr.slang b/tests/metal/vector-get-element-ptr.slang
new file mode 100644
index 000000000..af2acabbc
--- /dev/null
+++ b/tests/metal/vector-get-element-ptr.slang
@@ -0,0 +1,24 @@
+//TEST:SIMPLE(filecheck=CHECK): -target metal
+
+//TEST(smoke,compute):COMPARE_COMPUTE_EX(filecheck-buffer=BUF):-slang -compute -mtl
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+void modify(inout int v)
+{
+    v = 2;
+}
+
+[numthreads(1,1,1)]
+void computeMain(int3 v : SV_DispatchThreadID)
+{
+    int3 u = v;
+    // CHECK: int [[TEMP:[a-zA-Z0-9_]+]] = u{{.*}}.x;
+    // CHECK: modify{{.*}}(&[[TEMP]])
+    // CHECK: u{{.*}}.x = [[TEMP]];
+
+    modify(u.x);
+    // BUF: 2
+    outputBuffer[0] = u.x + u.y;
+}
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