[X86] Prevent selecting masked aligned load instructions if the load should be non-temporal

[craig.topper]

Summary

The aligned load predicates don't suppress themselves if the load is non-temporal the way the unaligned predicates do. For the most part this isn't a problem because the aligned predicates are mostly used for instructions that only load the the non-temporal loads have priority over those. The exception are masked loads.

[RKSimon]

LGTM

llvm/trunk/lib/Target/X86/X86InstrFragmentsSIMD.td

 // Like 'store', but always requires 512-bit vector alignment.
 def alignedstore512 : PatFrag<(ops node:$val, node:$ptr),
                               (store node:$val, node:$ptr), [{
   return cast<StoreSDNode>(N)->getAlignment() >= 64;
 }]>;
 
 // Like 'load', but always requires 128-bit vector alignment.
 def alignedload : PatFrag<(ops node:$ptr), (load node:$ptr), [{
-  return cast<LoadSDNode>(N)->getAlignment() >= 16;
+  return cast<LoadSDNode>(N)->getAlignment() >= 16 &&
+         (!Subtarget->hasSSE41() || !cast<LoadSDNode>(N)->isNonTemporal());
 }]>;
 
 // Like 'load', but always requires 256-bit vector alignment.
 def alignedload256 : PatFrag<(ops node:$ptr), (load node:$ptr), [{
-  return cast<LoadSDNode>(N)->getAlignment() >= 32;
+  return cast<LoadSDNode>(N)->getAlignment() >= 32 &&
+         (!Subtarget->hasAVX2() || !cast<LoadSDNode>(N)->isNonTemporal());
 }]>;
 
 // Like 'load', but always requires 512-bit vector alignment.
 def alignedload512 : PatFrag<(ops node:$ptr), (load node:$ptr), [{
-  return cast<LoadSDNode>(N)->getAlignment() >= 64;
+  return cast<LoadSDNode>(N)->getAlignment() >= 64 &&
+         (!Subtarget->hasAVX512() || !cast<LoadSDNode>(N)->isNonTemporal());
 }]>;
 
 // 128-bit aligned load pattern fragments
 // NOTE: all 128-bit integer vector loads are promoted to v2i64
 def alignedloadv4f32 : PatFrag<(ops node:$ptr),
                                (v4f32 (alignedload node:$ptr))>;
 def alignedloadv2f64 : PatFrag<(ops node:$ptr),
                                (v2f64 (alignedload node:$ptr))>;

llvm/trunk/test/CodeGen/X86/nontemporal-loads.ll

 ; AVX512VL:       # BB#0:
 ; AVX512VL-NEXT:    vmovups (%rdi), %ymm0
 ; AVX512VL-NEXT:    vmovups 32(%rdi), %ymm1
 ; AVX512VL-NEXT:    retq
   %1 = load <64 x i8>, <64 x i8>* %src, align 1, !nontemporal !1
   ret <64 x i8> %1
 }
 
+define <16 x i32> @test_masked_v16i32(i8 * %addr, <16 x i32> %old, <16 x i32> %mask1) {
+; SSE2-LABEL: test_masked_v16i32:
+; SSE2:       # BB#0:
+; SSE2-NEXT:    movdqa %xmm0, %xmm10
+; SSE2-NEXT:    pxor %xmm12, %xmm12
+; SSE2-NEXT:    pcmpeqd %xmm12, %xmm7
+; SSE2-NEXT:    pcmpeqd %xmm0, %xmm0
+; SSE2-NEXT:    movdqa %xmm7, %xmm8
+; SSE2-NEXT:    pxor %xmm0, %xmm8
+; SSE2-NEXT:    pcmpeqd %xmm12, %xmm6
+; SSE2-NEXT:    movdqa %xmm6, %xmm9
+; SSE2-NEXT:    pxor %xmm0, %xmm9
+; SSE2-NEXT:    pcmpeqd %xmm12, %xmm5
+; SSE2-NEXT:    movdqa %xmm5, %xmm11
+; SSE2-NEXT:    pxor %xmm0, %xmm11
+; SSE2-NEXT:    pcmpeqd %xmm12, %xmm4
+; SSE2-NEXT:    pxor %xmm4, %xmm0
+; SSE2-NEXT:    pandn (%rdi), %xmm4
+; SSE2-NEXT:    pandn %xmm10, %xmm0
+; SSE2-NEXT:    por %xmm4, %xmm0
+; SSE2-NEXT:    pandn 16(%rdi), %xmm5
+; SSE2-NEXT:    pandn %xmm1, %xmm11
+; SSE2-NEXT:    por %xmm5, %xmm11
+; SSE2-NEXT:    pandn 32(%rdi), %xmm6
+; SSE2-NEXT:    pandn %xmm2, %xmm9
+; SSE2-NEXT:    por %xmm6, %xmm9
+; SSE2-NEXT:    pandn 48(%rdi), %xmm7
+; SSE2-NEXT:    pandn %xmm3, %xmm8
+; SSE2-NEXT:    por %xmm7, %xmm8
+; SSE2-NEXT:    movdqa %xmm11, %xmm1
+; SSE2-NEXT:    movdqa %xmm9, %xmm2
+; SSE2-NEXT:    movdqa %xmm8, %xmm3
+; SSE2-NEXT:    retq
+;
+; SSE41-LABEL: test_masked_v16i32:
+; SSE41:       # BB#0:
+; SSE41-NEXT:    movdqa %xmm0, %xmm8
+; SSE41-NEXT:    pxor %xmm0, %xmm0
+; SSE41-NEXT:    pcmpeqd %xmm0, %xmm7
+; SSE41-NEXT:    pcmpeqd %xmm9, %xmm9
+; SSE41-NEXT:    pxor %xmm9, %xmm7
+; SSE41-NEXT:    pcmpeqd %xmm0, %xmm6
+; SSE41-NEXT:    pxor %xmm9, %xmm6
+; SSE41-NEXT:    pcmpeqd %xmm0, %xmm5
+; SSE41-NEXT:    pxor %xmm9, %xmm5
+; SSE41-NEXT:    pcmpeqd %xmm4, %xmm0
+; SSE41-NEXT:    pxor %xmm9, %xmm0
+; SSE41-NEXT:    movntdqa 48(%rdi), %xmm9
+; SSE41-NEXT:    movntdqa 32(%rdi), %xmm10
+; SSE41-NEXT:    movntdqa 16(%rdi), %xmm11
+; SSE41-NEXT:    movntdqa (%rdi), %xmm4
+; SSE41-NEXT:    blendvps %xmm0, %xmm4, %xmm8
+; SSE41-NEXT:    movdqa %xmm5, %xmm0
+; SSE41-NEXT:    blendvps %xmm0, %xmm11, %xmm1
+; SSE41-NEXT:    movdqa %xmm6, %xmm0
+; SSE41-NEXT:    blendvps %xmm0, %xmm10, %xmm2
+; SSE41-NEXT:    movdqa %xmm7, %xmm0
+; SSE41-NEXT:    blendvps %xmm0, %xmm9, %xmm3
+; SSE41-NEXT:    movaps %xmm8, %xmm0
+; SSE41-NEXT:    retq
+;
+; AVX1-LABEL: test_masked_v16i32:
+; AVX1:       # BB#0:
+; AVX1-NEXT:    vextractf128 $1, %ymm3, %xmm4
+; AVX1-NEXT:    vpxor %xmm5, %xmm5, %xmm5
+; AVX1-NEXT:    vpcmpeqd %xmm5, %xmm4, %xmm4
+; AVX1-NEXT:    vpcmpeqd %xmm6, %xmm6, %xmm6
+; AVX1-NEXT:    vpxor %xmm6, %xmm4, %xmm4
+; AVX1-NEXT:    vpcmpeqd %xmm5, %xmm3, %xmm3
+; AVX1-NEXT:    vpxor %xmm6, %xmm3, %xmm3
+; AVX1-NEXT:    vinsertf128 $1, %xmm4, %ymm3, %ymm3
+; AVX1-NEXT:    vextractf128 $1, %ymm2, %xmm4
+; AVX1-NEXT:    vpcmpeqd %xmm5, %xmm4, %xmm4
+; AVX1-NEXT:    vpxor %xmm6, %xmm4, %xmm4
+; AVX1-NEXT:    vpcmpeqd %xmm5, %xmm2, %xmm2
+; AVX1-NEXT:    vpxor %xmm6, %xmm2, %xmm2
+; AVX1-NEXT:    vinsertf128 $1, %xmm4, %ymm2, %ymm2
+; AVX1-NEXT:    vmovntdqa 32(%rdi), %xmm4
+; AVX1-NEXT:    vmovntdqa 48(%rdi), %xmm5
+; AVX1-NEXT:    vinsertf128 $1, %xmm5, %ymm4, %ymm4
+; AVX1-NEXT:    vblendvps %ymm3, %ymm4, %ymm1, %ymm1
+; AVX1-NEXT:    vmovntdqa (%rdi), %xmm3
+; AVX1-NEXT:    vmovntdqa 16(%rdi), %xmm4
+; AVX1-NEXT:    vinsertf128 $1, %xmm4, %ymm3, %ymm3
+; AVX1-NEXT:    vblendvps %ymm2, %ymm3, %ymm0, %ymm0
+; AVX1-NEXT:    retq
+;
+; AVX2-LABEL: test_masked_v16i32:
+; AVX2:       # BB#0:
+; AVX2-NEXT:    vpxor %ymm4, %ymm4, %ymm4
+; AVX2-NEXT:    vpcmpeqd %ymm4, %ymm3, %ymm3
+; AVX2-NEXT:    vpcmpeqd %ymm5, %ymm5, %ymm5
+; AVX2-NEXT:    vpxor %ymm5, %ymm3, %ymm3
+; AVX2-NEXT:    vpcmpeqd %ymm4, %ymm2, %ymm2
+; AVX2-NEXT:    vpxor %ymm5, %ymm2, %ymm2
+; AVX2-NEXT:    vmovntdqa 32(%rdi), %ymm4
+; AVX2-NEXT:    vblendvps %ymm3, %ymm4, %ymm1, %ymm1
+; AVX2-NEXT:    vmovntdqa (%rdi), %ymm3
+; AVX2-NEXT:    vblendvps %ymm2, %ymm3, %ymm0, %ymm0
+; AVX2-NEXT:    retq
+;
+; AVX512-LABEL: test_masked_v16i32:
+; AVX512:       # BB#0:
+; AVX512-NEXT:    vpxord %zmm2, %zmm2, %zmm2
+; AVX512-NEXT:    vpcmpneqd %zmm2, %zmm1, %k1
+; AVX512-NEXT:    vmovntdqa (%rdi), %zmm1
+; AVX512-NEXT:    vmovdqa32 %zmm1, %zmm0 {%k1}
+; AVX512-NEXT:    retq
+  %mask = icmp ne <16 x i32> %mask1, zeroinitializer
+  %vaddr = bitcast i8* %addr to <16 x i32>*
+  %r = load <16 x i32>, <16 x i32>* %vaddr, align 64, !nontemporal !1
+  %res = select <16 x i1> %mask, <16 x i32> %r, <16 x i32> %old
+  ret <16 x i32>%res
+}
+
 !1 = !{i32 1}