Fix reinterpret and bitcast and generic arg parsing. (#6627)

* Fix reinterpret and bitcast.

* Fix warning.

* Fix.

* Fix.

---------

Co-authored-by: Ellie Hermaszewska <ellieh@nvidia.com>

4 files changed, 96 insertions, 24 deletions

diff --git a/tests/language-feature/bit-cast/struct-bit-cast-2.slang b/tests/language-feature/bit-cast/struct-bit-cast-2.slang
new file mode 100644
index 000000000..edf91e00b
--- /dev/null
+++ b/tests/language-feature/bit-cast/struct-bit-cast-2.slang
@@ -0,0 +1,49 @@
+// struct-bit-cast-2.slang
+// Test bit casts for read across boundaries of scalar types.
+
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK): -vk -shaderobj
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK): -cpu -shaderobj
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK): -cuda -shaderobj
+
+// Test that bit_cast works for bit-reinterpreting one struct type as another.
+
+struct Foo
+{
+    uint16_t a;
+    uint16_t b;
+    uint32_t c;
+}
+
+struct Bar
+{
+    uint64_t d;
+}
+
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID : SV_DispatchThreadID)
+{
+    Bar b = { 0x1122334455667788 };
+
+    Foo f = bit_cast<Foo>(b);
+    // CHECK: 7788
+    outputBuffer[0] = f.a;
+    // CHECK: 5566
+    outputBuffer[1] = f.b;
+    // CHECK: 11223344
+    outputBuffer[2] = f.c;
+
+    uint8_t4 v = {0x10, 0x20, 0x30, 0x40};
+    uint32_t u = bit_cast<uint32_t>(v);
+
+    // CHECK: 40302010
+    outputBuffer[3] = u;
+
+    int* ptr = bit_cast<int*>(b.d);
+    Foo f1 = bit_cast<Foo>(ptr);
+    // CHECK: 11223344
+    outputBuffer[4] = f1.c;
+}
diff --git a/tests/language-feature/bit-cast/struct-reinterpret.slang b/tests/language-feature/bit-cast/struct-reinterpret.slang
new file mode 100644
index 000000000..6be359d79
--- /dev/null
+++ b/tests/language-feature/bit-cast/struct-reinterpret.slang
@@ -0,0 +1,47 @@
+// struct-bit-cast-2.slang
+// Test bit casts for read across boundaries of scalar types.
+
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK): -vk -shaderobj
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK): -cpu -shaderobj
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK): -cuda -shaderobj
+
+// Test that bit_cast works for bit-reinterpreting one struct type as another.
+
+struct Foo
+{
+    uint16_t a;
+    uint16_t b;
+    uint32_t c;
+}
+
+struct Bar
+{
+    uint64_t d;
+}
+
+
+//TEST_INPUT:ubuffer(data=[0 0 0 0 0], stride=4):out,name=outputBuffer
+RWStructuredBuffer<int> outputBuffer;
+
+[numthreads(1, 1, 1)]
+void computeMain(int3 dispatchThreadID : SV_DispatchThreadID)
+{
+    Bar b = { 0x1122334455667788 };
+    Foo f = reinterpret<Foo>(b);
+    // CHECK: 7788
+    outputBuffer[0] = f.a;
+    // CHECK: 5566
+    outputBuffer[1] = f.b;
+    // CHECK: 11223344
+    outputBuffer[2] = f.c;
+
+    uint8_t4 v = {0x10, 0x20, 0x30, 0x40};
+    uint32_t u = reinterpret<uint32_t>(v);
+
+    // CHECK: 40302010
+    outputBuffer[3] = u;
+    int* ptr = reinterpret<int*>(b.d);
+    Foo f1 = reinterpret<Foo>(ptr);
+    // CHECK: 11223344
+    outputBuffer[4] = f1.c;
+}
diff --git a/tests/language-feature/reinterpret/narrowing-reinterpret-warning.slang b/tests/language-feature/reinterpret/narrowing-reinterpret-warning.slang
deleted file mode 100644
index 98ed71165..000000000
--- a/tests/language-feature/reinterpret/narrowing-reinterpret-warning.slang
+++ /dev/null
@@ -1,12 +0,0 @@
-//TEST:SIMPLE(filecheck=CHECK): -target spirv -emit-spirv-directly -stage compute -entry computeMain
-
-uniform StructuredBuffer<uint32_t[2]> in;
-uniform RWStructuredBuffer<uint32_t> out;
-
-// CHECK: warning 41203{{.*}}8{{.*}}4
-
-[numthreads(4, 1, 1)]
-[shader("compute")]
-void computeMain() {
-    out[0] = reinterpret<uint32_t>(in[0]);
-}
\ No newline at end of file
diff --git a/tests/language-feature/reinterpret/widening-reinterpret-warning.slang b/tests/language-feature/reinterpret/widening-reinterpret-warning.slang
deleted file mode 100644
index 2f643cc3f..000000000
--- a/tests/language-feature/reinterpret/widening-reinterpret-warning.slang
+++ /dev/null
@@ -1,12 +0,0 @@
-//TEST:SIMPLE(filecheck=CHECK): -target spirv -emit-spirv-directly -stage compute -entry computeMain
-
-uniform StructuredBuffer<uint32_t> in;
-uniform RWStructuredBuffer<uint32_t[2]> out;
-
-//CHECK: warning 41203{{.*}}4{{.*}}8
-
-[numthreads(4, 1, 1)]
-[shader("compute")]
-void computeMain() {
-    out[0] = reinterpret<uint32_t[2]>(in[0]);
-}
\ No newline at end of file