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[DAGCombiner][X86][WIP] Combine (build_vector (load X))->(vecty (load X)) #88753

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[DAGCombiner][X86][WIP] Combine (build_vector (load X))->(vecty (load X)) #88753

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@topperc topperc commented Apr 15, 2024

This is an alternative to #88261.

This gets the mmx cases from that patch without affecting RISC-V.

The code here is largely lifted from the (bitcast (load))->(load) code.

@topperc
[DAGCombiner][X86][WIP] Combine (build_vector (load X))->(vecty (load…
c1570e9 
… X))

This is an alternative to llvm#88261.

This gets the mmx cases from that patch without affecting RISC-V.

The code here is largely lifted from the (bitcast (load))->(load) code.
@llvmbot llvmbot added backend:X86 llvm:SelectionDAG SelectionDAGISel as well labels Apr 15, 2024
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llvmbot commented Apr 15, 2024 •
edited

@llvm/pr-subscribers-llvm-selectiondag

@llvm/pr-subscribers-backend-x86

Author: Craig Topper (topperc)

Changes

This is an alternative to #88261.

This gets the mmx cases from that patch without affecting RISC-V.

The code here is largely lifted from the (bitcast (load))->(load) code.

Patch is 67.95 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/88753.diff

4 Files Affected:

  • (modified) llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp (+26)
  • (modified) llvm/test/CodeGen/X86/2007-05-15-maskmovq.ll (+2-13)
  • (modified) llvm/test/CodeGen/X86/mmx-intrinsics.ll (+221-819)
  • (modified) llvm/test/CodeGen/X86/pr35982.ll (+2-2)
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index dbbe8d9193c25c..beab5a052a048b 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -23501,6 +23501,32 @@ SDValue DAGCombiner::visitBUILD_VECTOR(SDNode *N) {
       return DAG.getNode(ISD::SPLAT_VECTOR, SDLoc(N), VT, V);
     }
 
+  if (N->getNumOperands() == 1) {
+    SDValue N0 = N->getOperand(0);
+    if (ISD::isNormalLoad(N0.getNode()) && N0.hasOneUse() &&
+        // Do not remove the cast if the types differ in endian layout.
+        TLI.hasBigEndianPartOrdering(N0.getValueType(), DAG.getDataLayout()) ==
+            TLI.hasBigEndianPartOrdering(VT, DAG.getDataLayout()) &&
+        // If the load is volatile, we only want to change the load type if the
+        // resulting load is legal. Otherwise we might increase the number of
+        // memory accesses. We don't care if the original type was legal or not
+        // as we assume software couldn't rely on the number of accesses of an
+        // illegal type.
+        ((!LegalOperations && cast<LoadSDNode>(N0)->isSimple()) ||
+         TLI.isOperationLegal(ISD::LOAD, VT))) {
+      LoadSDNode *LN0 = cast<LoadSDNode>(N0);
+
+      if (TLI.isLoadBitCastBeneficial(N0.getValueType(), VT, DAG,
+                                      *LN0->getMemOperand())) {
+        SDValue Load =
+            DAG.getLoad(VT, SDLoc(N), LN0->getChain(), LN0->getBasePtr(),
+                        LN0->getMemOperand());
+        DAG.ReplaceAllUsesOfValueWith(N0.getValue(1), Load.getValue(1));
+        return Load;
+      }
+    }
+  }
+
   return SDValue();
 }
 
diff --git a/llvm/test/CodeGen/X86/2007-05-15-maskmovq.ll b/llvm/test/CodeGen/X86/2007-05-15-maskmovq.ll
index 69f733461efc77..3ced6c9483a6c8 100644
--- a/llvm/test/CodeGen/X86/2007-05-15-maskmovq.ll
+++ b/llvm/test/CodeGen/X86/2007-05-15-maskmovq.ll
@@ -6,22 +6,11 @@ define void @test(<1 x i64> %c64, <1 x i64> %mask1, ptr %P) {
 ; CHECK:       ## %bb.0: ## %entry
 ; CHECK-NEXT:    pushl %edi
 ; CHECK-NEXT:    .cfi_def_cfa_offset 8
-; CHECK-NEXT:    subl $16, %esp
-; CHECK-NEXT:    .cfi_def_cfa_offset 24
 ; CHECK-NEXT:    .cfi_offset %edi, -8
-; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %eax
-; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %ecx
-; CHECK-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; CHECK-NEXT:    movl %eax, (%esp)
-; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %eax
-; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %ecx
-; CHECK-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; CHECK-NEXT:    movl %eax, {{[0-9]+}}(%esp)
 ; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %edi
-; CHECK-NEXT:    movq (%esp), %mm0
+; CHECK-NEXT:    movq {{[0-9]+}}(%esp), %mm0
 ; CHECK-NEXT:    movq {{[0-9]+}}(%esp), %mm1
-; CHECK-NEXT:    maskmovq %mm0, %mm1
-; CHECK-NEXT:    addl $16, %esp
+; CHECK-NEXT:    maskmovq %mm1, %mm0
 ; CHECK-NEXT:    popl %edi
 ; CHECK-NEXT:    retl
 entry:
diff --git a/llvm/test/CodeGen/X86/mmx-intrinsics.ll b/llvm/test/CodeGen/X86/mmx-intrinsics.ll
index a43d9400cde6c8..a7917d58cde5d7 100644
--- a/llvm/test/CodeGen/X86/mmx-intrinsics.ll
+++ b/llvm/test/CodeGen/X86/mmx-intrinsics.ll
@@ -12,17 +12,9 @@ define i64 @test1(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    phaddw {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    phaddw 16(%ebp), %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -57,17 +49,9 @@ define i64 @test88(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    pcmpgtd {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    pcmpgtd 16(%ebp), %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -102,17 +86,9 @@ define i64 @test87(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    pcmpgtw {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    pcmpgtw 16(%ebp), %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -147,17 +123,9 @@ define i64 @test86(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    pcmpgtb {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    pcmpgtb 16(%ebp), %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -192,17 +160,9 @@ define i64 @test85(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    pcmpeqd {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    pcmpeqd 16(%ebp), %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -237,17 +197,9 @@ define i64 @test84(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    pcmpeqw {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    pcmpeqw 16(%ebp), %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -282,17 +234,9 @@ define i64 @test83(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    pcmpeqb {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    pcmpeqb 16(%ebp), %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -327,17 +271,9 @@ define i64 @test82(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    punpckldq {{[0-9]+}}(%esp), %mm0 # mm0 = mm0[0],mem[0]
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    punpckldq 16(%ebp), %mm0 # mm0 = mm0[0],mem[0]
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -372,17 +308,9 @@ define i64 @test81(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    punpcklwd {{[0-9]+}}(%esp), %mm0 # mm0 = mm0[0],mem[0],mm0[1],mem[1]
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    punpcklwd 16(%ebp), %mm0 # mm0 = mm0[0],mem[0],mm0[1],mem[1]
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -417,17 +345,9 @@ define i64 @test80(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    punpcklbw {{[0-9]+}}(%esp), %mm0 # mm0 = mm0[0],mem[0],mm0[1],mem[1],mm0[2],mem[2],mm0[3],mem[3]
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    punpcklbw 16(%ebp), %mm0 # mm0 = mm0[0],mem[0],mm0[1],mem[1],mm0[2],mem[2],mm0[3],mem[3]
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -462,17 +382,9 @@ define i64 @test79(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    punpckhdq {{[0-9]+}}(%esp), %mm0 # mm0 = mm0[1],mem[1]
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    punpckhdq 16(%ebp), %mm0 # mm0 = mm0[1],mem[1]
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -507,17 +419,9 @@ define i64 @test78(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    punpckhwd {{[0-9]+}}(%esp), %mm0 # mm0 = mm0[2],mem[2],mm0[3],mem[3]
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    punpckhwd 16(%ebp), %mm0 # mm0 = mm0[2],mem[2],mm0[3],mem[3]
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -552,17 +456,9 @@ define i64 @test77(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    punpckhbw {{[0-9]+}}(%esp), %mm0 # mm0 = mm0[4],mem[4],mm0[5],mem[5],mm0[6],mem[6],mm0[7],mem[7]
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    punpckhbw 16(%ebp), %mm0 # mm0 = mm0[4],mem[4],mm0[5],mem[5],mm0[6],mem[6],mm0[7],mem[7]
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -597,17 +493,9 @@ define i64 @test76(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    packuswb {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    packuswb 16(%ebp), %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -642,17 +530,9 @@ define i64 @test75(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    packssdw {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    packssdw 16(%ebp), %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -687,17 +567,9 @@ define i64 @test74(<1 x i64> %a, <1 x i64> %b) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $24, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl 16(%ebp), %eax
-; X86-NEXT:    movl 20(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
-; X86-NEXT:    packsswb {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
+; X86-NEXT:    packsswb 16(%ebp), %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -732,12 +604,8 @@ define i64 @test73(<1 x i64> %a) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $16, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
 ; X86-NEXT:    psrad $3, %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
@@ -770,12 +638,8 @@ define i64 @test72(<1 x i64> %a) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $16, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
 ; X86-NEXT:    psraw $3, %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
@@ -806,12 +670,8 @@ define i64 @test72_2(<1 x i64> %a) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $16, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -873,12 +733,8 @@ define i64 @test70(<1 x i64> %a) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $16, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
 ; X86-NEXT:    psrld $3, %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
@@ -909,12 +765,8 @@ define i64 @test70_2(<1 x i64> %a) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $16, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    movl %eax, {{[0-9]+}}(%esp)
-; X86-NEXT:    movq {{[0-9]+}}(%esp), %mm0
+; X86-NEXT:    subl $8, %esp
+; X86-NEXT:    movq 8(%ebp), %mm0
 ; X86-NEXT:    movq %mm0, (%esp)
 ; X86-NEXT:    movl (%esp), %eax
 ; X86-NEXT:    movl {{[0-9]+}}(%esp), %edx
@@ -944,12 +796,8 @@ define i64 @test69(<1 x i64> %a) nounwind readnone optsize ssp {
 ; X86-NEXT:    pushl %ebp
 ; X86-NEXT:    movl %esp, %ebp
 ; X86-NEXT:    andl $-8, %esp
-; X86-NEXT:    subl $16, %esp
-; X86-NEXT:    movl 8(%ebp), %eax
-; X86-NEXT:    movl 12(%ebp), %ecx
-; X86-NEXT:    movl %ecx, {{[0-9]+}}(%esp)
-; X86-NEXT:    m...
[truncated]

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⚠️ C/C++ code formatter, clang-format found issues in your code. ⚠️

You can test this locally with the following command: 
git-clang-format --diff a06073f91e7bbbb532e68bbf6b903c2f5051f4c2 c1570e959de48e876202d8a6e679abd20a554176 -- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
View the diff from clang-format here. 
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index beab5a052a..e758f25eec 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -23518,9 +23518,8 @@ SDValue DAGCombiner::visitBUILD_VECTOR(SDNode *N) {
 
       if (TLI.isLoadBitCastBeneficial(N0.getValueType(), VT, DAG,
                                       *LN0->getMemOperand())) {
-        SDValue Load =
-            DAG.getLoad(VT, SDLoc(N), LN0->getChain(), LN0->getBasePtr(),
-                        LN0->getMemOperand());
+        SDValue Load = DAG.getLoad(VT, SDLoc(N), LN0->getChain(),
+                                   LN0->getBasePtr(), LN0->getMemOperand());
         DAG.ReplaceAllUsesOfValueWith(N0.getValue(1), Load.getValue(1));
         return Load;
       }

@RKSimon
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RKSimon commented Apr 15, 2024

Just to clear - #88261 is not about improving MMX codegen (it was just a weird WTF moment). I'm happy to continue work on the riscv changes\regressions.

@topperc
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topperc commented Apr 15, 2024

Just to clear - #88261 is not about improving MMX codegen (it was just a weird WTF moment). I'm happy to continue work on the riscv changes\regressions.

Is it part of a larger series or should I look closer at the other changes in 88261?

It just seemed like build_pair should be removed by type legalization and the opportunities should be visible post type legalization without the build_pair.

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@arsenm arsenm Awaiting requested review from arsenm

@preames preames Awaiting requested review from preames

@RKSimon RKSimon Awaiting requested review from RKSimon

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