llvm.org GIT mirror llvm / release_37 test / CodeGen / X86 / switch-or.ll
release_37

Tree @release_37 (Download .tar.gz)

switch-or.ll @release_37raw · history · blame

; RUN: llc -march=x86 -asm-verbose=false < %s | FileCheck %s

; Check that merging switch cases that differ in one bit works.
; CHECK-LABEL: test1
; CHECK: orl $2
; CHECK-NEXT: cmpl $6

define void @test1(i32 %variable) nounwind {
entry:
  switch i32 %variable, label %if.end [
    i32 4, label %if.then
    i32 6, label %if.then
  ]

if.then:
  %call = tail call i32 (...) @bar() nounwind
  ret void

if.end:
  ret void
}

; CHECK-LABEL: test2
; CHECK: orl $-2147483648
; CHECK-NEXT: cmpl $-2147483648
define void @test2(i32 %variable) nounwind {
entry:
  switch i32 %variable, label %if.end [
    i32 0, label %if.then
    i32 -2147483648, label %if.then
  ]

if.then:
  %call = tail call i32 (...) @bar() nounwind
  ret void

if.end:
  ret void
}

declare i32 @bar(...) nounwind