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|
; RUN: opt < %s -instcombine -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 @foo1(i32* %a) #0 {
entry:
%0 = load i32* %a, align 4
; Check that the alignment has been upgraded and that the assume has not
; been removed:
; CHECK-LABEL: @foo1
; CHECK-DAG: load i32* %a, align 32
; CHECK-DAG: call void @llvm.assume
; CHECK: ret i32
%ptrint = ptrtoint i32* %a to i64
%maskedptr = and i64 %ptrint, 31
%maskcond = icmp eq i64 %maskedptr, 0
tail call void @llvm.assume(i1 %maskcond)
ret i32 %0
}
; Function Attrs: nounwind uwtable
define i32 @foo2(i32* %a) #0 {
entry:
; Same check as in @foo1, but make sure it works if the assume is first too.
; CHECK-LABEL: @foo2
; CHECK-DAG: load i32* %a, align 32
; CHECK-DAG: call void @llvm.assume
; CHECK: ret i32
%ptrint = ptrtoint i32* %a to i64
%maskedptr = and i64 %ptrint, 31
%maskcond = icmp eq i64 %maskedptr, 0
tail call void @llvm.assume(i1 %maskcond)
%0 = load i32* %a, align 4
ret i32 %0
}
; Function Attrs: nounwind
declare void @llvm.assume(i1) #1
; Function Attrs: nounwind uwtable
define i32 @can1(i1 %a, i1 %b, i1 %c) {
entry:
%and1 = and i1 %a, %b
%and = and i1 %and1, %c
tail call void @llvm.assume(i1 %and)
; CHECK-LABEL: @can1
; CHECK: call void @llvm.assume(i1 %a)
; CHECK: call void @llvm.assume(i1 %b)
; CHECK: call void @llvm.assume(i1 %c)
; CHECK: ret i32
ret i32 5
}
; Function Attrs: nounwind uwtable
define i32 @can2(i1 %a, i1 %b, i1 %c) {
entry:
%v = or i1 %a, %b
%w = xor i1 %v, 1
tail call void @llvm.assume(i1 %w)
; CHECK-LABEL: @can2
; CHECK: %[[V1:[^ ]+]] = xor i1 %a, true
; CHECK: call void @llvm.assume(i1 %[[V1]])
; CHECK: %[[V2:[^ ]+]] = xor i1 %b, true
; CHECK: call void @llvm.assume(i1 %[[V2]])
; CHECK: ret i32
ret i32 5
}
define i32 @bar1(i32 %a) #0 {
entry:
%and1 = and i32 %a, 3
; CHECK-LABEL: @bar1
; CHECK: call void @llvm.assume
; CHECK: ret i32 1
%and = and i32 %a, 7
%cmp = icmp eq i32 %and, 1
tail call void @llvm.assume(i1 %cmp)
ret i32 %and1
}
; Function Attrs: nounwind uwtable
define i32 @bar2(i32 %a) #0 {
entry:
; CHECK-LABEL: @bar2
; CHECK: call void @llvm.assume
; CHECK: ret i32 1
%and = and i32 %a, 7
%cmp = icmp eq i32 %and, 1
tail call void @llvm.assume(i1 %cmp)
%and1 = and i32 %a, 3
ret i32 %and1
}
; Function Attrs: nounwind uwtable
define i32 @bar3(i32 %a, i1 %x, i1 %y) #0 {
entry:
%and1 = and i32 %a, 3
; Don't be fooled by other assumes around.
; CHECK-LABEL: @bar3
; CHECK: call void @llvm.assume
; CHECK: ret i32 1
tail call void @llvm.assume(i1 %x)
%and = and i32 %a, 7
%cmp = icmp eq i32 %and, 1
tail call void @llvm.assume(i1 %cmp)
tail call void @llvm.assume(i1 %y)
ret i32 %and1
}
; Function Attrs: nounwind uwtable
define i32 @bar4(i32 %a, i32 %b) {
entry:
%and1 = and i32 %b, 3
; CHECK-LABEL: @bar4
; CHECK: call void @llvm.assume
; CHECK: call void @llvm.assume
; CHECK: ret i32 1
%and = and i32 %a, 7
%cmp = icmp eq i32 %and, 1
tail call void @llvm.assume(i1 %cmp)
%cmp2 = icmp eq i32 %a, %b
tail call void @llvm.assume(i1 %cmp2)
ret i32 %and1
}
define i32 @icmp1(i32 %a) #0 {
entry:
%cmp = icmp sgt i32 %a, 5
tail call void @llvm.assume(i1 %cmp)
%conv = zext i1 %cmp to i32
ret i32 %conv
; CHECK-LABEL: @icmp1
; CHECK: call void @llvm.assume
; CHECK: ret i32 1
}
; Function Attrs: nounwind uwtable
define i32 @icmp2(i32 %a) #0 {
entry:
%cmp = icmp sgt i32 %a, 5
tail call void @llvm.assume(i1 %cmp)
%0 = zext i1 %cmp to i32
%lnot.ext = xor i32 %0, 1
ret i32 %lnot.ext
; CHECK-LABEL: @icmp2
; CHECK: call void @llvm.assume
; CHECK: ret i32 0
}
attributes #0 = { nounwind uwtable }
attributes #1 = { nounwind }
|
