[llvm] [X86] Combine LRINT/LLRINT and TRUNC when nuw/nsw (PR #126217)

[Simon Pilgrim via llvm-commits]

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@@ -183,6 +183,94 @@ entry:
   ret i64 %0
 }
 
+define i32 @combine_f32_trunc(float %x) nounwind {
+; SSE-LABEL: combine_trunc:
+; SSE:       # %bb.0: # %entry
+; SSE-NEXT:    cvtss2si %xmm0, %eax
+; SSE-NEXT:    retq
+;
+; AVX-LABEL: combine_trunc:
+; AVX:       # %bb.0: # %entry
+; AVX-NEXT:    vcvtss2si %xmm0, %eax
+; AVX-NEXT:    retq
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RKSimon wrote:

cleanup fixes check prefixes

https://github.com/llvm/llvm-project/pull/126217