[X86] Add test coverage for #142513

Author: RKSimon

llvm/test/CodeGen/X86/pr142513.ll

@@ -0,0 +1,38 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s -mtriple=i686-unknown-unknown | FileCheck %s --check-prefixes=X86
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown | FileCheck %s --check-prefixes=X64
+
+define i64 @foo(i64 %x) {
+; X86-LABEL: foo:
+; X86:       # %bb.0: # %entry
+; X86-NEXT:    movl {{[0-9]+}}(%esp), %eax
+; X86-NEXT:    shrl $15, %eax
+; X86-NEXT:    cmpl $65509, %eax # imm = 0xFFE5
+; X86-NEXT:    je .LBB0_1
+; X86-NEXT:  # %bb.2: # %if.end
+; X86-NEXT:    movl $3, %eax
+; X86-NEXT:    movl $2146598912, %edx # imm = 0x7FF28000
+; X86-NEXT:    retl
+; X86-NEXT:  .LBB0_1: # %if.then
+;
+; X64-LABEL: foo:
+; X64:       # %bb.0: # %entry
+; X64-NEXT:    shrq $47, %rdi
+; X64-NEXT:    cmpl $65509, %edi # imm = 0xFFE5
+; X64-NEXT:    je .LBB0_1
+; X64-NEXT:  # %bb.2: # %if.end
+; X64-NEXT:    movabsq $9219572124669181952, %rax # imm = 0x7FF2800000000000
+; X64-NEXT:    addq $3, %rax
+; X64-NEXT:    retq
+; X64-NEXT:  .LBB0_1: # %if.then
+entry:
+  %shr.mask = and i64 %x, -140737488355328
+  %cmp = icmp eq i64 %shr.mask, 9219572124669181952
+  br i1 %cmp, label %if.then, label %if.end
+
+if.then:
+  unreachable
+
+if.end:
+  ret i64 9219572124669181955
+}