[X86] Add test coverage for TESTPS/TESTPD showing the failure to demand only the sign bits

Part of Issue llvm#60007

Author: RKSimon

llvm/test/CodeGen/X86/combine-testpd.ll

@@ -149,6 +149,51 @@ define i32 @testpdnzc_256_invert0(<4 x double> %c, <4 x double> %d, i32 %a, i32
   ret i32 %t5
 }
 
+;
+; SimplifyDemandedBits - only the sign bit is required
+;
+
+define i32 @testpdc_128_signbit(<2 x double> %c, <2 x double> %d, i32 %a, i32 %b) {
+; CHECK-LABEL: testpdc_128_signbit:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    movl %edi, %eax
+; CHECK-NEXT:    vpxor %xmm2, %xmm2, %xmm2
+; CHECK-NEXT:    vpcmpgtq %xmm0, %xmm2, %xmm0
+; CHECK-NEXT:    vtestpd %xmm1, %xmm0
+; CHECK-NEXT:    cmovael %esi, %eax
+; CHECK-NEXT:    retq
+  %t0 = bitcast <2 x double> %c to <2 x i64>
+  %t1 = ashr <2 x i64> %t0, <i64 63, i64 63>
+  %t2 = bitcast <2 x i64> %t1 to <2 x double>
+  %t3 = call i32 @llvm.x86.avx.vtestc.pd(<2 x double> %t2, <2 x double> %d)
+  %t4 = icmp ne i32 %t3, 0
+  %t5 = select i1 %t4, i32 %a, i32 %b
+  ret i32 %t5
+}
+
+define i32 @testpdz_256_signbit(<4 x double> %c, <4 x double> %d, i32 %a, i32 %b) {
+; CHECK-LABEL: testpdz_256_signbit:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    movl %edi, %eax
+; CHECK-NEXT:    vextractf128 $1, %ymm0, %xmm2
+; CHECK-NEXT:    vpxor %xmm3, %xmm3, %xmm3
+; CHECK-NEXT:    vpcmpgtq %xmm2, %xmm3, %xmm2
+; CHECK-NEXT:    vpcmpgtq %xmm0, %xmm3, %xmm0
+; CHECK-NEXT:    vinsertf128 $1, %xmm2, %ymm0, %ymm0
+; CHECK-NEXT:    vtestpd %ymm1, %ymm0
+; CHECK-NEXT:    cmovnel %esi, %eax
+; CHECK-NEXT:    vzeroupper
+; CHECK-NEXT:    retq
+  %t0 = bitcast <4 x double> %c to <4 x i64>
+  %t1 = icmp sgt <4 x i64> zeroinitializer, %t0
+  %t2 = sext <4 x i1> %t1 to <4 x i64>
+  %t3 = bitcast <4 x i64> %t2 to <4 x double>
+  %t4 = call i32 @llvm.x86.avx.vtestz.pd.256(<4 x double> %t3, <4 x double> %d)
+  %t5 = icmp ne i32 %t4, 0
+  %t6 = select i1 %t5, i32 %a, i32 %b
+  ret i32 %t6
+}
+
 declare i32 @llvm.x86.avx.vtestz.pd(<2 x double>, <2 x double>) nounwind readnone
 declare i32 @llvm.x86.avx.vtestc.pd(<2 x double>, <2 x double>) nounwind readnone
 declare i32 @llvm.x86.avx.vtestnzc.pd(<2 x double>, <2 x double>) nounwind readnone

llvm/test/CodeGen/X86/combine-testps.ll

@@ -149,6 +149,50 @@ define i32 @testpsnzc_256_invert0(<8 x float> %c, <8 x float> %d, i32 %a, i32 %b
   ret i32 %t5
 }
 
+;
+; SimplifyDemandedBits - only the sign bit is required
+;
+
+define i32 @testpsz_128_signbit(<4 x float> %c, <4 x float> %d, i32 %a, i32 %b) {
+; CHECK-LABEL: testpsz_128_signbit:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    movl %edi, %eax
+; CHECK-NEXT:    vpsrad $31, %xmm0, %xmm0
+; CHECK-NEXT:    vtestps %xmm1, %xmm0
+; CHECK-NEXT:    cmovnel %esi, %eax
+; CHECK-NEXT:    retq
+  %t0 = bitcast <4 x float> %c to <4 x i32>
+  %t1 = ashr <4 x i32> %t0, <i32 31, i32 31, i32 31, i32 31>
+  %t2 = bitcast <4 x i32> %t1 to <4 x float>
+  %t3 = call i32 @llvm.x86.avx.vtestz.ps(<4 x float> %t2, <4 x float> %d)
+  %t4 = icmp ne i32 %t3, 0
+  %t5 = select i1 %t4, i32 %a, i32 %b
+  ret i32 %t5
+}
+
+define i32 @testpsnzc_256_signbit(<8 x float> %c, <8 x float> %d, i32 %a, i32 %b) {
+; CHECK-LABEL: testpsnzc_256_signbit:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    movl %edi, %eax
+; CHECK-NEXT:    vextractf128 $1, %ymm0, %xmm2
+; CHECK-NEXT:    vpxor %xmm3, %xmm3, %xmm3
+; CHECK-NEXT:    vpcmpgtd %xmm2, %xmm3, %xmm2
+; CHECK-NEXT:    vpcmpgtd %xmm0, %xmm3, %xmm0
+; CHECK-NEXT:    vinsertf128 $1, %xmm2, %ymm0, %ymm0
+; CHECK-NEXT:    vtestps %ymm1, %ymm0
+; CHECK-NEXT:    cmovnel %esi, %eax
+; CHECK-NEXT:    vzeroupper
+; CHECK-NEXT:    retq
+  %t0 = bitcast <8 x float> %c to <8 x i32>
+  %t1 = icmp sgt <8 x i32> zeroinitializer, %t0
+  %t2 = sext <8 x i1> %t1 to <8 x i32>
+  %t3 = bitcast <8 x i32> %t2 to <8 x float>
+  %t4 = call i32 @llvm.x86.avx.vtestz.ps.256(<8 x float> %t3, <8 x float> %d)
+  %t5 = icmp ne i32 %t4, 0
+  %t6 = select i1 %t5, i32 %a, i32 %b
+  ret i32 %t6
+}
+
 declare i32 @llvm.x86.avx.vtestz.ps(<4 x float>, <4 x float>) nounwind readnone
 declare i32 @llvm.x86.avx.vtestc.ps(<4 x float>, <4 x float>) nounwind readnone
 declare i32 @llvm.x86.avx.vtestnzc.ps(<4 x float>, <4 x float>) nounwind readnone