[X86][ADX] Added memory folding patterns and stack folding tests

llvm-svn: 254844

2 files changed, 51 insertions, 0 deletions

diff --git a/llvm/lib/Target/X86/X86InstrInfo.cpp b/llvm/lib/Target/X86/X86InstrInfo.cpp
index ebe329064c5..34d4e90b310 100644
--- a/llvm/lib/Target/X86/X86InstrInfo.cpp
+++ b/llvm/lib/Target/X86/X86InstrInfo.cpp
@@ -1650,6 +1650,12 @@ X86InstrInfo::X86InstrInfo(X86Subtarget &STI)
     { X86::PEXT32rr,          X86::PEXT32rm,            0 },
     { X86::PEXT64rr,          X86::PEXT64rm,            0 },
 
+    // ADX foldable instructions
+    { X86::ADCX32rr,          X86::ADCX32rm,            0 },
+    { X86::ADCX64rr,          X86::ADCX64rm,            0 },
+    { X86::ADOX32rr,          X86::ADOX32rm,            0 },
+    { X86::ADOX64rr,          X86::ADOX64rm,            0 },
+
     // AVX-512 foldable instructions
     { X86::VADDPSZrr,         X86::VADDPSZrm,           0 },
     { X86::VADDPDZrr,         X86::VADDPDZrm,           0 },
diff --git a/llvm/test/CodeGen/X86/stack-folding-adx-x86_64.ll b/llvm/test/CodeGen/X86/stack-folding-adx-x86_64.ll
new file mode 100644
index 00000000000..5f109f09aa1
--- /dev/null
+++ b/llvm/test/CodeGen/X86/stack-folding-adx-x86_64.ll
@@ -0,0 +1,45 @@
+; RUN: llc -O3 -disable-peephole -mtriple=x86_64-unknown-unknown -mattr=+adx < %s | FileCheck %s
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-unknown"
+
+; Stack reload folding tests.
+;
+; By including a nop call with sideeffects we can force a partial register spill of the
+; relevant registers and check that the reload is correctly folded into the instruction.
+
+define i8 @stack_fold_addcarry_u32(i8 %a0, i32 %a1, i32 %a2, i8* %a3) {
+  ;CHECK-LABEL: stack_fold_addcarry_u32
+  ;CHECK:       adcxl {{-?[0-9]*}}(%rsp), %ecx {{.*#+}} 4-byte Folded Reload
+  %1 = tail call i64 asm sideeffect "nop", "=x,~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15}"()
+  %2 = tail call i8 @llvm.x86.addcarry.u32(i8 %a0, i32 %a1, i32 %a2, i8* %a3)
+  ret i8 %2;
+}
+declare i8 @llvm.x86.addcarry.u32(i8, i32, i32, i8*)
+
+define i8 @stack_fold_addcarry_u64(i8 %a0, i64 %a1, i64 %a2, i8* %a3) {
+  ;CHECK-LABEL: stack_fold_addcarry_u64
+  ;CHECK:       adcxq {{-?[0-9]*}}(%rsp), %rcx {{.*#+}} 8-byte Folded Reload
+  %1 = tail call i64 asm sideeffect "nop", "=x,~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15}"()
+  %2 = tail call i8 @llvm.x86.addcarry.u64(i8 %a0, i64 %a1, i64 %a2, i8* %a3)
+  ret i8 %2;
+}
+declare i8 @llvm.x86.addcarry.u64(i8, i64, i64, i8*)
+
+define i8 @stack_fold_addcarryx_u32(i8 %a0, i32 %a1, i32 %a2, i8* %a3) {
+  ;CHECK-LABEL: stack_fold_addcarryx_u32
+  ;CHECK:       adcxl {{-?[0-9]*}}(%rsp), %ecx {{.*#+}} 4-byte Folded Reload
+  %1 = tail call i64 asm sideeffect "nop", "=x,~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15}"()
+  %2 = tail call i8 @llvm.x86.addcarryx.u32(i8 %a0, i32 %a1, i32 %a2, i8* %a3)
+  ret i8 %2;
+}
+declare i8 @llvm.x86.addcarryx.u32(i8, i32, i32, i8*)
+
+define i8 @stack_fold_addcarryx_u64(i8 %a0, i64 %a1, i64 %a2, i8* %a3) {
+  ;CHECK-LABEL: stack_fold_addcarryx_u64
+  ;CHECK:       adcxq {{-?[0-9]*}}(%rsp), %rcx {{.*#+}} 8-byte Folded Reload
+  %1 = tail call i64 asm sideeffect "nop", "=x,~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15}"()
+  %2 = tail call i8 @llvm.x86.addcarryx.u64(i8 %a0, i64 %a1, i64 %a2, i8* %a3)
+  ret i8 %2;
+}
+declare i8 @llvm.x86.addcarryx.u64(i8, i64, i64, i8*)