xref: /aosp_15_r20/external/llvm/test/Transforms/JumpThreading/assume.ll (revision 9880d6810fe72a1726cb53787c6711e909410d58)

; RUN: opt -S -jump-threading -dce < %s | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

; Function Attrs: nounwind uwtable
define i32 @test1(i32 %a, i32 %b) #0 {
entry:
  %cmp = icmp sgt i32 %a, 5
  tail call void @llvm.assume(i1 %cmp)
  %cmp1 = icmp sgt i32 %b, 1234
  br i1 %cmp1, label %if.then, label %if.else

; CHECK-LABEL: @test1
; CHECK: icmp sgt i32 %a, 5
; CHECK: call void @llvm.assume
; CHECK-NOT: icmp sgt i32 %a, 3
; CHECK: ret i32

if.then:                                          ; preds = %entry
  %cmp2 = icmp sgt i32 %a, 3
  br i1 %cmp2, label %if.then3, label %return

if.then3:                                         ; preds = %if.then
  tail call void (...) @bar() #1
  br label %return

if.else:                                          ; preds = %entry
  tail call void (...) @car() #1
  br label %return

return:                                           ; preds = %if.else, %if.then, %if.then3
  %retval.0 = phi i32 [ 1, %if.then3 ], [ 0, %if.then ], [ 0, %if.else ]
  ret i32 %retval.0
}

define i32 @test2(i32 %a) #0 {
entry:
  %cmp = icmp sgt i32 %a, 5
  tail call void @llvm.assume(i1 %cmp)
  %cmp1 = icmp sgt i32 %a, 3
  br i1 %cmp1, label %if.then, label %return

; CHECK-LABEL: @test2
; CHECK: icmp sgt i32 %a, 5
; CHECK: tail call void @llvm.assume
; CHECK: tail call void (...) @bar()
; CHECK: ret i32 1


if.then:                                          ; preds = %entry
  tail call void (...) @bar() #1
  br label %return

return:                                           ; preds = %entry, %if.then
  %retval.0 = phi i32 [ 1, %if.then ], [ 0, %entry ]
  ret i32 %retval.0
}

; Function Attrs: nounwind
declare void @llvm.assume(i1) #1

declare void @bar(...)

declare void @car(...)

attributes #0 = { nounwind uwtable }
attributes #1 = { nounwind }