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clang-p2996/llvm/test/Transforms/CorrelatedValuePropagation/basic.ll
Philip Reames adf0e35308 [LVI] Extend select handling to catch min/max/clamp idioms 
Most of this is fairly straight forward. Add handling for min/max via existing matcher utility and ConstantRange routines.  Add handling for clamp by exploiting condition constraints on inputs.  

Note that I'm only handling two constant ranges at this point. It would be reasonable to consider treating overdefined as a full range if the instruction is typed as an integer, but that should be a separate change.

Differential Revision: http://reviews.llvm.org/D17184

llvm-svn: 262085
2016-02-26 22:53:59 +00:00

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7.7 KiB
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; RUN: opt < %s -correlated-propagation -S | FileCheck %s
; PR2581
; CHECK-LABEL: @test1(
define i32 @test1(i1 %C) nounwind {
br i1 %C, label %exit, label %body
body: ; preds = %0
; CHECK-NOT: select
%A = select i1 %C, i32 10, i32 11 ; <i32> [#uses=1]
; CHECK: ret i32 11
ret i32 %A
exit: ; preds = %0
; CHECK: ret i32 10
ret i32 10
}
; PR4420
declare i1 @ext()
; CHECK-LABEL: @test2(
define i1 @test2() {
entry:
%cond = tail call i1 @ext() ; <i1> [#uses=2]
br i1 %cond, label %bb1, label %bb2
bb1: ; preds = %entry
%cond2 = tail call i1 @ext() ; <i1> [#uses=1]
br i1 %cond2, label %bb3, label %bb2
bb2: ; preds = %bb1, %entry
; CHECK-NOT: phi i1
%cond_merge = phi i1 [ %cond, %entry ], [ false, %bb1 ] ; <i1> [#uses=1]
; CHECK: ret i1 false
ret i1 %cond_merge
bb3: ; preds = %bb1
%res = tail call i1 @ext() ; <i1> [#uses=1]
; CHECK: ret i1 %res
ret i1 %res
}
; PR4855
@gv = internal constant i8 7
; CHECK-LABEL: @test3(
define i8 @test3(i8* %a) nounwind {
entry:
%cond = icmp eq i8* %a, @gv
br i1 %cond, label %bb2, label %bb
bb: ; preds = %entry
ret i8 0
bb2: ; preds = %entry
; CHECK: %should_be_const = load i8, i8* @gv
%should_be_const = load i8, i8* %a
ret i8 %should_be_const
}
; PR1757
; CHECK-LABEL: @test4(
define i32 @test4(i32) {
EntryBlock:
; CHECK: icmp sgt i32 %0, 2
%.demorgan = icmp sgt i32 %0, 2
br i1 %.demorgan, label %GreaterThanTwo, label %LessThanOrEqualToTwo
GreaterThanTwo:
; CHECK-NOT: icmp eq i32 %0, 2
icmp eq i32 %0, 2
; CHECK: br i1 false
br i1 %1, label %Impossible, label %NotTwoAndGreaterThanTwo
NotTwoAndGreaterThanTwo:
ret i32 2
Impossible:
ret i32 1
LessThanOrEqualToTwo:
ret i32 0
}
declare i32* @f(i32*)
define void @test5(i32* %x, i32* %y) {
; CHECK-LABEL: @test5(
entry:
%pre = icmp eq i32* %x, null
br i1 %pre, label %return, label %loop
loop:
%phi = phi i32* [ %sel, %loop ], [ %x, %entry ]
; CHECK: %phi = phi i32* [ %f, %loop ], [ %x, %entry ]
%f = tail call i32* @f(i32* %phi)
%cmp1 = icmp ne i32* %f, %y
%sel = select i1 %cmp1, i32* %f, i32* null
%cmp2 = icmp eq i32* %sel, null
br i1 %cmp2, label %return, label %loop
return:
ret void
}
define i32 @switch1(i32 %s) {
; CHECK-LABEL: @switch1(
entry:
%cmp = icmp slt i32 %s, 0
br i1 %cmp, label %negative, label %out
negative:
switch i32 %s, label %out [
; CHECK: switch i32 %s, label %out
i32 0, label %out
; CHECK-NOT: i32 0
i32 1, label %out
; CHECK-NOT: i32 1
i32 -1, label %next
; CHECK: i32 -1, label %next
i32 -2, label %next
; CHECK: i32 -2, label %next
i32 2, label %out
; CHECK-NOT: i32 2
i32 3, label %out
; CHECK-NOT: i32 3
]
out:
%p = phi i32 [ 1, %entry ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ], [ -1, %negative ]
ret i32 %p
next:
%q = phi i32 [ 0, %negative ], [ 0, %negative ]
ret i32 %q
}
define i32 @switch2(i32 %s) {
; CHECK-LABEL: @switch2(
entry:
%cmp = icmp sgt i32 %s, 0
br i1 %cmp, label %positive, label %out
positive:
switch i32 %s, label %out [
i32 0, label %out
i32 -1, label %next
i32 -2, label %next
]
; CHECK: br label %out
out:
%p = phi i32 [ -1, %entry ], [ 1, %positive ], [ 1, %positive ]
ret i32 %p
next:
%q = phi i32 [ 0, %positive ], [ 0, %positive ]
ret i32 %q
}
define i32 @switch3(i32 %s) {
; CHECK-LABEL: @switch3(
entry:
%cmp = icmp sgt i32 %s, 0
br i1 %cmp, label %positive, label %out
positive:
switch i32 %s, label %out [
i32 -1, label %out
i32 -2, label %next
i32 -3, label %next
]
; CHECK: br label %out
out:
%p = phi i32 [ -1, %entry ], [ 1, %positive ], [ 1, %positive ]
ret i32 %p
next:
%q = phi i32 [ 0, %positive ], [ 0, %positive ]
ret i32 %q
}
define void @switch4(i32 %s) {
; CHECK-LABEL: @switch4(
entry:
%cmp = icmp eq i32 %s, 0
br i1 %cmp, label %zero, label %out
zero:
switch i32 %s, label %out [
i32 0, label %next
i32 1, label %out
i32 -1, label %out
]
; CHECK: br label %next
out:
ret void
next:
ret void
}
define i1 @umin(i32 %a, i32 %b) {
; CHECK-LABEL: @umin(
entry:
%cmp = icmp ult i32 %a, 5
br i1 %cmp, label %a_guard, label %out
a_guard:
%cmp2 = icmp ult i32 %b, 20
br i1 %cmp2, label %b_guard, label %out
b_guard:
%sel_cmp = icmp ult i32 %a, %b
%min = select i1 %sel_cmp, i32 %a, i32 %b
%res = icmp eq i32 %min, 7
br label %next
next:
; CHECK: next:
; CHECK: ret i1 false
ret i1 %res
out:
ret i1 false
}
define i1 @smin(i32 %a, i32 %b) {
; CHECK-LABEL: @smin(
entry:
%cmp = icmp ult i32 %a, 5
br i1 %cmp, label %a_guard, label %out
a_guard:
%cmp2 = icmp ult i32 %b, 20
br i1 %cmp2, label %b_guard, label %out
b_guard:
%sel_cmp = icmp sle i32 %a, %b
%min = select i1 %sel_cmp, i32 %a, i32 %b
%res = icmp eq i32 %min, 7
br label %next
next:
; CHECK: next:
; CHECK: ret i1 false
ret i1 %res
out:
ret i1 false
}
define i1 @smax(i32 %a, i32 %b) {
; CHECK-LABEL: @smax(
entry:
%cmp = icmp sgt i32 %a, 5
br i1 %cmp, label %a_guard, label %out
a_guard:
%cmp2 = icmp sgt i32 %b, 20
br i1 %cmp2, label %b_guard, label %out
b_guard:
%sel_cmp = icmp sge i32 %a, %b
%max = select i1 %sel_cmp, i32 %a, i32 %b
%res = icmp eq i32 %max, 7
br label %next
next:
; CHECK: next:
; CHECK: ret i1 false
ret i1 %res
out:
ret i1 false
}
define i1 @umax(i32 %a, i32 %b) {
; CHECK-LABEL: @umax(
entry:
%cmp = icmp sgt i32 %a, 5
br i1 %cmp, label %a_guard, label %out
a_guard:
%cmp2 = icmp sgt i32 %b, 20
br i1 %cmp2, label %b_guard, label %out
b_guard:
%sel_cmp = icmp uge i32 %a, %b
%max = select i1 %sel_cmp, i32 %a, i32 %b
%res = icmp eq i32 %max, 7
br label %next
next:
; CHECK: next:
; CHECK: ret i1 false
ret i1 %res
out:
ret i1 false
}
define i1 @clamp_low1(i32 %a) {
; CHECK-LABEL: @clamp_low1(
entry:
%cmp = icmp sge i32 %a, 5
br i1 %cmp, label %a_guard, label %out
a_guard:
%sel_cmp = icmp eq i32 %a, 5
%add = add i32 %a, -1
%sel = select i1 %sel_cmp, i32 5, i32 %a
%res = icmp eq i32 %sel, 4
br label %next
next:
; CHECK: next:
; CHECK: ret i1 false
ret i1 %res
out:
ret i1 false
}
define i1 @clamp_low2(i32 %a) {
; CHECK-LABEL: @clamp_low2(
entry:
%cmp = icmp sge i32 %a, 5
br i1 %cmp, label %a_guard, label %out
a_guard:
%sel_cmp = icmp ne i32 %a, 5
%add = add i32 %a, -1
%sel = select i1 %sel_cmp, i32 %a, i32 5
%res = icmp eq i32 %sel, 4
br label %next
next:
; CHECK: next:
; CHECK: ret i1 false
ret i1 %res
out:
ret i1 false
}
define i1 @clamp_high1(i32 %a) {
; CHECK-LABEL: @clamp_high1(
entry:
%cmp = icmp sle i32 %a, 5
br i1 %cmp, label %a_guard, label %out
a_guard:
%sel_cmp = icmp eq i32 %a, 5
%add = add i32 %a, 1
%sel = select i1 %sel_cmp, i32 5, i32 %a
%res = icmp eq i32 %sel, 6
br label %next
next:
; CHECK: next:
; CHECK: ret i1 false
ret i1 %res
out:
ret i1 false
}
define i1 @clamp_high2(i32 %a) {
; CHECK-LABEL: @clamp_high2(
entry:
%cmp = icmp sle i32 %a, 5
br i1 %cmp, label %a_guard, label %out
a_guard:
%sel_cmp = icmp ne i32 %a, 5
%add = add i32 %a, 1
%sel = select i1 %sel_cmp, i32 %a, i32 5
%res = icmp eq i32 %sel, 6
br label %next
next:
; CHECK: next:
; CHECK: ret i1 false
ret i1 %res
out:
ret i1 false
}
; Just showing arbitrary constants work, not really a clamp
define i1 @clamp_high3(i32 %a) {
; CHECK-LABEL: @clamp_high3(
entry:
%cmp = icmp sle i32 %a, 5
br i1 %cmp, label %a_guard, label %out
a_guard:
%sel_cmp = icmp ne i32 %a, 5
%add = add i32 %a, 100
%sel = select i1 %sel_cmp, i32 %a, i32 5
%res = icmp eq i32 %sel, 105
br label %next
next:
; CHECK: next:
; CHECK: ret i1 false
ret i1 %res
out:
ret i1 false
}
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