[llvm] AMDGPU: Add baseline tests for bitcast + readlane intrinsics (PR #128493)

[Pierre van Houtryve via llvm-commits]

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@@ -6,8 +6,19 @@ define i32 @test_constant() {
 ; CHECK-LABEL: @test_constant(
 ; CHECK-NEXT:    ret i32 99
 ;
-  %call = call i32 @llvm.amdgcn.permlane64(i32 99)
+  %call = call i32 @llvm.amdgcn.permlane64.i32(i32 99)
   ret i32 %call
 }
 
-declare i32 @llvm.amdgcn.permlane64(i32)
+define i32 @test_bitcast_f32_to_i32_permlane64(float %val) {
+; CHECK-LABEL: @test_bitcast_f32_to_i32_permlane64(
+; CHECK-NEXT:    [[BITCAST:%.*]] = bitcast float [[VAL:%.*]] to i32
+; CHECK-NEXT:    [[RESULT:%.*]] = call i32 @llvm.amdgcn.permlane64.i32(i32 [[BITCAST]])
+; CHECK-NEXT:    ret i32 [[RESULT]]
+;
+  %bitcast = bitcast float %val to i32
+  %result = call i32 @llvm.amdgcn.permlane64.i32(i32 %bitcast)
+  ret i32 %result
+}
+
+declare i32 @llvm.amdgcn.permlane64.i32(i32)
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Pierre-vh wrote:

do we still need intrinsic declarations? Wasn't there a change to make them unnecessary?

https://github.com/llvm/llvm-project/pull/128493