[X86] Add some initial BEXTR combine tests

diff --git a/llvm/test/CodeGen/X86/combine-bextr.ll b/llvm/test/CodeGen/X86/combine-bextr.ll
new file mode 100644 (file)
index 0000000..3cfcb14
--- /dev/null
+++ b/llvm/test/CodeGen/X86/combine-bextr.ll
@@ -0,0 +1,70 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=i686-unknown-unknown -mattr=+sse2,+bmi | FileCheck %s --check-prefixes=X32
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+sse2,+bmi | FileCheck %s --check-prefixes=X64
+
+declare i32 @llvm.x86.bmi.bextr.32(i32, i32)
+
+define i32 @bextr_zero_length(i32 %x, i32 %y) {
+; X32-LABEL: bextr_zero_length:
+; X32:       # %bb.0:
+; X32-NEXT:    movzbl {{[0-9]+}}(%esp), %eax
+; X32-NEXT:    bextrl %eax, {{[0-9]+}}(%esp), %eax
+; X32-NEXT:    retl
+;
+; X64-LABEL: bextr_zero_length:
+; X64:       # %bb.0:
+; X64-NEXT:    movzbl %sil, %eax
+; X64-NEXT:    bextrl %eax, %edi, %eax
+; X64-NEXT:    retq
+  %1 = and i32 %y, 255
+  %2 = tail call i32 @llvm.x86.bmi.bextr.32(i32 %x, i32 %1)
+  ret i32 %2
+}
+
+define i32 @bextr_big_shift(i32 %x, i32 %y) {
+; X32-LABEL: bextr_big_shift:
+; X32:       # %bb.0:
+; X32-NEXT:    movl $255, %eax
+; X32-NEXT:    orl {{[0-9]+}}(%esp), %eax
+; X32-NEXT:    bextrl %eax, {{[0-9]+}}(%esp), %eax
+; X32-NEXT:    retl
+;
+; X64-LABEL: bextr_big_shift:
+; X64:       # %bb.0:
+; X64-NEXT:    orl $255, %esi
+; X64-NEXT:    bextrl %esi, %edi, %eax
+; X64-NEXT:    retq
+  %1 = or i32 %y, 255
+  %2 = tail call i32 @llvm.x86.bmi.bextr.32(i32 %x, i32 %1)
+  ret i32 %2
+}
+
+define float @bextr_uitofp(i32 %x, i32 %y) {
+; X32-LABEL: bextr_uitofp:
+; X32:       # %bb.0:
+; X32-NEXT:    pushl %eax
+; X32-NEXT:    .cfi_def_cfa_offset 8
+; X32-NEXT:    movl $3855, %eax # imm = 0xF0F
+; X32-NEXT:    bextrl %eax, {{[0-9]+}}(%esp), %eax
+; X32-NEXT:    movq {{.*#+}} xmm0 = mem[0],zero
+; X32-NEXT:    movd %eax, %xmm1
+; X32-NEXT:    por %xmm0, %xmm1
+; X32-NEXT:    subsd %xmm0, %xmm1
+; X32-NEXT:    xorps %xmm0, %xmm0
+; X32-NEXT:    cvtsd2ss %xmm1, %xmm0
+; X32-NEXT:    movss %xmm0, (%esp)
+; X32-NEXT:    flds (%esp)
+; X32-NEXT:    popl %eax
+; X32-NEXT:    .cfi_def_cfa_offset 4
+; X32-NEXT:    retl
+;
+; X64-LABEL: bextr_uitofp:
+; X64:       # %bb.0:
+; X64-NEXT:    movl $3855, %eax # imm = 0xF0F
+; X64-NEXT:    bextrl %eax, %edi, %eax
+; X64-NEXT:    cvtsi2ss %rax, %xmm0
+; X64-NEXT:    retq
+  %1 = tail call i32 @llvm.x86.bmi.bextr.32(i32 %x, i32 3855)
+  %2 = uitofp i32 %1 to float
+  ret float %2
+}