[X86] Teach isel that X86ISD::CMPM_RND zeros the upper bits of the mask register.

llvm-svn: 318933

diff --git a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
index 504482a..93a3b92 100644 (file)
--- a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -456,7 +456,8 @@ static bool isLegalMaskCompare(SDNode *N, const X86Subtarget *Subtarget) {
   unsigned Opcode = N->getOpcode();
   if (Opcode == X86ISD::PCMPEQM || Opcode == X86ISD::PCMPGTM ||
       Opcode == X86ISD::CMPM || Opcode == X86ISD::TESTM ||
-      Opcode == X86ISD::TESTNM || Opcode == X86ISD::CMPMU) {
+      Opcode == X86ISD::TESTNM || Opcode == X86ISD::CMPMU ||
+      Opcode == X86ISD::CMPM_RND) {
     // We can get 256-bit 8 element types here without VLX being enabled. When
     // this happens we will use 512-bit operations and the mask will not be
     // zero extended.

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index eabaad8..c0d8504 100644 (file)
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -5013,6 +5013,7 @@ static bool isMaskedZeroUpperBitsvXi1(unsigned int Opcode) {
   case X86ISD::PCMPGTM:
   case X86ISD::CMPM:
   case X86ISD::CMPMU:
+  case X86ISD::CMPM_RND:
     return true;
   }
 }

diff --git a/llvm/test/CodeGen/X86/avx512vl-vec-masked-cmp.ll b/llvm/test/CodeGen/X86/avx512vl-vec-masked-cmp.ll
index 26a7d83..673e442 100644 (file)
--- a/llvm/test/CodeGen/X86/avx512vl-vec-masked-cmp.ll
+++ b/llvm/test/CodeGen/X86/avx512vl-vec-masked-cmp.ll
@@ -58076,5 +58076,117 @@ entry:
   ret i64 %3
 }
 
-
-
+; Test that we understand that cmpps with rounding zeros the upper bits of the mask register.
+define i32 @test_cmpm_rnd_zero(<16 x float> %a, <16 x float> %b) {
+; VLX-LABEL: test_cmpm_rnd_zero:
+; VLX:       # BB#0:
+; VLX-NEXT:    vcmpleps {sae}, %zmm1, %zmm0, %k0
+; VLX-NEXT:    kmovd %k0, %eax
+; VLX-NEXT:    vzeroupper
+; VLX-NEXT:    retq
+;
+; NoVLX-LABEL: test_cmpm_rnd_zero:
+; NoVLX:       # BB#0:
+; NoVLX-NEXT:    pushq %rbp
+; NoVLX-NEXT:    .cfi_def_cfa_offset 16
+; NoVLX-NEXT:    .cfi_offset %rbp, -16
+; NoVLX-NEXT:    movq %rsp, %rbp
+; NoVLX-NEXT:    .cfi_def_cfa_register %rbp
+; NoVLX-NEXT:    pushq %r15
+; NoVLX-NEXT:    pushq %r14
+; NoVLX-NEXT:    pushq %r13
+; NoVLX-NEXT:    pushq %r12
+; NoVLX-NEXT:    pushq %rbx
+; NoVLX-NEXT:    andq $-32, %rsp
+; NoVLX-NEXT:    subq $32, %rsp
+; NoVLX-NEXT:    .cfi_offset %rbx, -56
+; NoVLX-NEXT:    .cfi_offset %r12, -48
+; NoVLX-NEXT:    .cfi_offset %r13, -40
+; NoVLX-NEXT:    .cfi_offset %r14, -32
+; NoVLX-NEXT:    .cfi_offset %r15, -24
+; NoVLX-NEXT:    vcmpleps {sae}, %zmm1, %zmm0, %k0
+; NoVLX-NEXT:    kxorw %k0, %k0, %k1
+; NoVLX-NEXT:    kmovw %k1, {{[0-9]+}}(%rsp)
+; NoVLX-NEXT:    kshiftlw $14, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    kmovw %k1, %r8d
+; NoVLX-NEXT:    kshiftlw $15, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    kmovw %k1, %r10d
+; NoVLX-NEXT:    kshiftlw $13, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    kmovw %k1, %r9d
+; NoVLX-NEXT:    kshiftlw $12, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    kmovw %k1, %r11d
+; NoVLX-NEXT:    kshiftlw $11, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    kmovw %k1, %r14d
+; NoVLX-NEXT:    kshiftlw $10, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    kmovw %k1, %r15d
+; NoVLX-NEXT:    kshiftlw $9, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    kmovw %k1, %r12d
+; NoVLX-NEXT:    kshiftlw $8, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    kmovw %k1, %r13d
+; NoVLX-NEXT:    kshiftlw $7, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    kmovw %k1, %esi
+; NoVLX-NEXT:    kshiftlw $6, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    kmovw %k1, %ebx
+; NoVLX-NEXT:    kshiftlw $5, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    kmovw %k1, %edi
+; NoVLX-NEXT:    kshiftlw $4, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    kmovw %k1, %eax
+; NoVLX-NEXT:    kshiftlw $3, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    kmovw %k1, %edx
+; NoVLX-NEXT:    kshiftlw $2, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    vmovd %r10d, %xmm0
+; NoVLX-NEXT:    kmovw %k1, %r10d
+; NoVLX-NEXT:    kshiftlw $1, %k0, %k1
+; NoVLX-NEXT:    kshiftrw $15, %k1, %k1
+; NoVLX-NEXT:    vpinsrb $1, %r8d, %xmm0, %xmm0
+; NoVLX-NEXT:    kmovw %k1, %ecx
+; NoVLX-NEXT:    vpinsrb $2, %r9d, %xmm0, %xmm0
+; NoVLX-NEXT:    vpinsrb $3, %r11d, %xmm0, %xmm0
+; NoVLX-NEXT:    vpinsrb $4, %r14d, %xmm0, %xmm0
+; NoVLX-NEXT:    vpinsrb $5, %r15d, %xmm0, %xmm0
+; NoVLX-NEXT:    vpinsrb $6, %r12d, %xmm0, %xmm0
+; NoVLX-NEXT:    vpinsrb $7, %r13d, %xmm0, %xmm0
+; NoVLX-NEXT:    vpinsrb $8, %esi, %xmm0, %xmm0
+; NoVLX-NEXT:    vpinsrb $9, %ebx, %xmm0, %xmm0
+; NoVLX-NEXT:    vpinsrb $10, %edi, %xmm0, %xmm0
+; NoVLX-NEXT:    vpinsrb $11, %eax, %xmm0, %xmm0
+; NoVLX-NEXT:    vpinsrb $12, %edx, %xmm0, %xmm0
+; NoVLX-NEXT:    kshiftrw $15, %k0, %k0
+; NoVLX-NEXT:    vpinsrb $13, %r10d, %xmm0, %xmm0
+; NoVLX-NEXT:    vpinsrb $14, %ecx, %xmm0, %xmm0
+; NoVLX-NEXT:    kmovw %k0, %eax
+; NoVLX-NEXT:    vpinsrb $15, %eax, %xmm0, %xmm0
+; NoVLX-NEXT:    vpmovsxbd %xmm0, %zmm0
+; NoVLX-NEXT:    vpslld $31, %zmm0, %zmm0
+; NoVLX-NEXT:    vptestmd %zmm0, %zmm0, %k0
+; NoVLX-NEXT:    kmovw %k0, (%rsp)
+; NoVLX-NEXT:    movl (%rsp), %eax
+; NoVLX-NEXT:    leaq -40(%rbp), %rsp
+; NoVLX-NEXT:    popq %rbx
+; NoVLX-NEXT:    popq %r12
+; NoVLX-NEXT:    popq %r13
+; NoVLX-NEXT:    popq %r14
+; NoVLX-NEXT:    popq %r15
+; NoVLX-NEXT:    popq %rbp
+; NoVLX-NEXT:    vzeroupper
+; NoVLX-NEXT:    retq
+  %res = call i16 @llvm.x86.avx512.mask.cmp.ps.512(<16 x float> %a, <16 x float> %b, i32 2, i16 -1, i32 8)
+  %cast = bitcast i16 %res to <16 x i1>
+  %shuffle = shufflevector <16 x i1> %cast, <16 x i1> zeroinitializer, <32 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 12, i32 13, i32 14, i32 15, i32 16, i32 17, i32 18, i32 19, i32 20, i32 21, i32 22, i32 23, i32 24, i32 25, i32 26, i32 27, i32 28, i32 29, i32 30, i32 31>
+  %cast2 = bitcast <32 x i1> %shuffle to i32
+  ret i32 %cast2
+}