[llvm] [NVPTX] Implemented istruncatefree and iszextfree alongwith test cases. (PR #115139)

[Justin Fargnoli via llvm-commits]

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@@ -0,0 +1,54 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -march=nvptx64 < %s | FileCheck %s
+
+; Test for truncation from i64 to i32
+define i32 @test_trunc_i64_to_i32(i64 %val) {
+; CHECK-LABEL: test_trunc_i64_to_i32(
+; CHECK:       {
+; CHECK-NEXT:    .reg .b32 %r<2>;
+; CHECK-EMPTY:
+; CHECK-NEXT:  // %bb.0:
+; CHECK-NEXT:    ld.param.u32 %r1, [test_trunc_i64_to_i32_param_0];
+; CHECK-NEXT:    st.param.b32 [func_retval0], %r1;
+; CHECK-NEXT:    ret;
+  %trunc = trunc i64 %val to i32
+  ret i32 %trunc
+}
+
+; Test for zero-extension from i32 to i64
+define i64 @test_zext_i32_to_i64(i32 %val) {
+; CHECK-LABEL: test_zext_i32_to_i64(
+; CHECK:       {
+; CHECK-NEXT:    .reg .b64 %rd<2>;
+; CHECK-EMPTY:
+; CHECK-NEXT:  // %bb.0:
+; CHECK-NEXT:    ld.param.u32 %rd1, [test_zext_i32_to_i64_param_0];
+; CHECK-NEXT:    st.param.b64 [func_retval0], %rd1;
+; CHECK-NEXT:    ret;
+  %zext = zext i32 %val to i64
+  ret i64 %zext
+}
+
+; Test for operand truncation before select
+define i32 @test_select_truncate_free(i1 %cond, i64 %a, i64 %b) {
+; CHECK-LABEL: test_select_truncate_free(
+; CHECK:       {
+; CHECK-NEXT:    .reg .pred %p<2>;
+; CHECK-NEXT:    .reg .b16 %rs<3>;
+; CHECK-NEXT:    .reg .b32 %r<4>;
+; CHECK-EMPTY:
+; CHECK-NEXT:  // %bb.0:
+; CHECK-NEXT:    ld.param.u8 %rs1, [test_select_truncate_free_param_0];
+; CHECK-NEXT:    and.b16 %rs2, %rs1, 1;
+; CHECK-NEXT:    setp.eq.b16 %p1, %rs2, 1;
+; CHECK-NEXT:    ld.param.u32 %r1, [test_select_truncate_free_param_1];
+; CHECK-NEXT:    ld.param.u32 %r2, [test_select_truncate_free_param_2];
+; CHECK-NEXT:    selp.b32 %r3, %r1, %r2, %p1;
+; CHECK-NEXT:    st.param.b32 [func_retval0], %r3;
+; CHECK-NEXT:    ret;
+
+  %trunc_a = trunc i64 %a to i32
+  %trunc_b = trunc i64 %b to i32
+  %result = select i1 %cond, i32 %trunc_a, i32 %trunc_b
+  ret i32 %result
+}
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justinfargnoli wrote:

It looks like this test won't fail without the change. See [Compiler Explorer](https://godbolt.org/z/jh7vvofc3). This means that we need to find a different test case that will fail without the change and pass with it. 

https://github.com/llvm/llvm-project/pull/115139