[x86] add current codegen tests for PR27924

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272714 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/CodeGen/X86/vector-compare-combines.ll b/test/CodeGen/X86/vector-compare-combines.ll
new file mode 100644 (file)
index 0000000..11272db
--- /dev/null
+++ b/test/CodeGen/X86/vector-compare-combines.ll
@@ -0,0 +1,51 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+sse4.2 | FileCheck %s --check-prefix=SSE --check-prefix=SSE42
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+avx | FileCheck %s --check-prefix=AVX --check-prefix=AVX1
+
+; FIXME: If we have SSE/AVX intrinsics in the code, we miss obvious combines
+; unless we do them late on X86-specific nodes.
+
+declare <4 x i32> @llvm.x86.sse41.pmaxsd(<4 x i32>, <4 x i32>)
+
+define <4 x i32> @PR27924_cmpeq(<4 x i32> %a, <4 x i32> %b) {
+; SSE-LABEL: PR27924_cmpeq:
+; SSE:       # BB#0:
+; SSE-NEXT:    pmaxsd %xmm1, %xmm0
+; SSE-NEXT:    pcmpeqd %xmm0, %xmm0
+; SSE-NEXT:    retq
+;
+; AVX-LABEL: PR27924_cmpeq:
+; AVX:       # BB#0:
+; AVX-NEXT:    vpmaxsd %xmm1, %xmm0, %xmm0
+; AVX-NEXT:    vpcmpeqd %xmm0, %xmm0, %xmm0
+; AVX-NEXT:    retq
+;
+  %cmp = icmp sgt <4 x i32> %a, %b
+  %max = select <4 x i1> %cmp, <4 x i32> %a, <4 x i32> %b
+  %sse_max = tail call <4 x i32> @llvm.x86.sse41.pmaxsd(<4 x i32> %a, <4 x i32> %b)
+  %truth = icmp eq <4 x i32> %max, %sse_max
+  %ret = sext <4 x i1> %truth to <4 x i32>
+  ret <4 x i32> %ret
+}
+
+define <4 x i32> @PR27924_cmpgt(<4 x i32> %a, <4 x i32> %b) {
+; SSE-LABEL: PR27924_cmpgt:
+; SSE:       # BB#0:
+; SSE-NEXT:    pmaxsd %xmm1, %xmm0
+; SSE-NEXT:    pcmpgtd %xmm0, %xmm0
+; SSE-NEXT:    retq
+;
+; AVX-LABEL: PR27924_cmpgt:
+; AVX:       # BB#0:
+; AVX-NEXT:    vpmaxsd %xmm1, %xmm0, %xmm0
+; AVX-NEXT:    vpcmpgtd %xmm0, %xmm0, %xmm0
+; AVX-NEXT:    retq
+;
+  %cmp = icmp sgt <4 x i32> %a, %b
+  %max = select <4 x i1> %cmp, <4 x i32> %a, <4 x i32> %b
+  %sse_max = tail call <4 x i32> @llvm.x86.sse41.pmaxsd(<4 x i32> %a, <4 x i32> %b)
+  %untruth = icmp sgt <4 x i32> %max, %sse_max
+  %ret = sext <4 x i1> %untruth to <4 x i32>
+  ret <4 x i32> %ret
+}
+