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llvm-project/llvm/test/Transforms/ConstraintElimination/sge.ll
Florian Hahn 0a781d98fb
[ConstraintElimination] Add initial signed support. 
This patch adds initial support for signed conditions. To do so,
ConstraintElimination maintains two separate systems, one with facts
from signed and one for unsigned conditions.

To start with this means information from signed and unsigned conditions
is kept completely separate. When it is safe to do so, information from
signed conditions may be also transferred to the unsigned system and
vice versa. That's left for follow-ups.

In the initial version, de-composition of signed values just handles
constants and otherwise just uses the value, without trying to
decompose the operation. Again this can be extended in follow-up
changes.

The main benefit of this limited signed support is proving >=s 0
pre-conditions added in D118799. But even this initial version also
fixes PR53273.

Depends on D118799.

Reviewed By: reames

Differential Revision: https://reviews.llvm.org/D118806
2022-02-04 14:02:48 +00:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=constraint-elimination -S %s | FileCheck %s
declare void @use(i1)
define void @test_1_variable_constraint(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @test_1_variable_constraint(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[C_1:%.*]] = icmp sge i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: br i1 [[C_1]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[T_1:%.*]] = icmp sge i32 [[X]], [[Y]]
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[C_2:%.*]] = icmp sge i32 [[X]], 10
; CHECK-NEXT: call void @use(i1 [[C_2]])
; CHECK-NEXT: [[C_3:%.*]] = icmp sge i32 [[Y]], [[X]]
; CHECK-NEXT: call void @use(i1 [[C_3]])
; CHECK-NEXT: [[C_4:%.*]] = icmp sge i32 10, [[X]]
; CHECK-NEXT: call void @use(i1 [[C_4]])
; CHECK-NEXT: ret void
; CHECK: bb2:
; CHECK-NEXT: [[T_2:%.*]] = icmp sge i32 [[Y]], [[X]]
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[F_1:%.*]] = icmp sge i32 [[X]], [[Y]]
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[C_5:%.*]] = icmp sge i32 [[X]], 10
; CHECK-NEXT: call void @use(i1 [[C_5]])
; CHECK-NEXT: [[C_6:%.*]] = icmp sge i32 10, [[X]]
; CHECK-NEXT: call void @use(i1 [[C_6]])
; CHECK-NEXT: ret void
;
entry:
%c.1 = icmp sge i32 %x, %y
br i1 %c.1, label %bb1, label %bb2
bb1:
%t.1 = icmp sge i32 %x, %y
call void @use(i1 %t.1)
%c.2 = icmp sge i32 %x, 10
call void @use(i1 %c.2)
%c.3 = icmp sge i32 %y, %x
call void @use(i1 %c.3)
%c.4 = icmp sge i32 10, %x
call void @use(i1 %c.4)
ret void
bb2:
%t.2 = icmp sge i32 %y, %x
call void @use(i1 %t.2)
%f.1 = icmp sge i32 %x, %y
call void @use(i1 %f.1)
%c.5 = icmp sge i32 %x, 10
call void @use(i1 %c.5)
%c.6 = icmp sge i32 10, %x
call void @use(i1 %c.6)
ret void
}
define void @test_1_constant_constraint(i32 %x) {
; CHECK-LABEL: @test_1_constant_constraint(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[C_1:%.*]] = icmp sge i32 [[X:%.*]], 10
; CHECK-NEXT: br i1 [[C_1]], label [[BB1:%.*]], label [[BB2:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[T_1:%.*]] = icmp sge i32 [[X]], 10
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[T_2:%.*]] = icmp sge i32 [[X]], 9
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[C_2:%.*]] = icmp sge i32 [[X]], 11
; CHECK-NEXT: call void @use(i1 [[C_2]])
; CHECK-NEXT: [[C_4:%.*]] = icmp sge i32 10, [[X]]
; CHECK-NEXT: call void @use(i1 [[C_4]])
; CHECK-NEXT: ret void
; CHECK: bb2:
; CHECK-NEXT: [[T_3:%.*]] = icmp sge i32 11, [[X]]
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[F_1:%.*]] = icmp sge i32 [[X]], 10
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[F_1_1:%.*]] = icmp sge i32 [[X]], 10
; CHECK-NEXT: call void @use(i1 false)
; CHECK-NEXT: [[C_5:%.*]] = icmp sge i32 [[X]], 9
; CHECK-NEXT: call void @use(i1 [[C_5]])
; CHECK-NEXT: [[C_6:%.*]] = icmp sge i32 1, [[X]]
; CHECK-NEXT: call void @use(i1 [[C_6]])
; CHECK-NEXT: ret void
;
entry:
%c.1 = icmp sge i32 %x, 10
br i1 %c.1, label %bb1, label %bb2
bb1:
%t.1 = icmp sge i32 %x, 10
call void @use(i1 %t.1)
%t.2 = icmp sge i32 %x, 9
call void @use(i1 %t.2)
%c.2 = icmp sge i32 %x, 11
call void @use(i1 %c.2)
%c.4 = icmp sge i32 10, %x
call void @use(i1 %c.4)
ret void
bb2:
%t.3 = icmp sge i32 11, %x
call void @use(i1 %t.3)
%f.1 = icmp sge i32 %x, 10
call void @use(i1 %f.1)
%f.1.1 = icmp sge i32 %x, 10
call void @use(i1 %f.1.1)
%c.5 = icmp sge i32 %x, 9
call void @use(i1 %c.5)
%c.6 = icmp sge i32 1, %x
call void @use(i1 %c.6)
ret void
}
define i32 @test1(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[C_1:%.*]] = icmp sge i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: br i1 [[C_1]], label [[BB1:%.*]], label [[EXIT:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[C_2:%.*]] = icmp sge i32 [[Y]], [[Z:%.*]]
; CHECK-NEXT: br i1 [[C_2]], label [[BB2:%.*]], label [[EXIT]]
; CHECK: bb2:
; CHECK-NEXT: [[C_3:%.*]] = icmp sge i32 [[X]], [[Z]]
; CHECK-NEXT: br i1 true, label [[BB3:%.*]], label [[EXIT]]
; CHECK: bb3:
; CHECK-NEXT: ret i32 10
; CHECK: exit:
; CHECK-NEXT: ret i32 20
;
entry:
%c.1 = icmp sge i32 %x, %y
br i1 %c.1, label %bb1, label %exit
bb1:
%c.2 = icmp sge i32 %y, %z
br i1 %c.2, label %bb2, label %exit
bb2:
%c.3 = icmp sge i32 %x, %z
br i1 %c.3, label %bb3, label %exit
bb3:
ret i32 10
exit:
ret i32 20
}
define i32 @test2(i32 %x, i32 %y, i32 %z, i32 %a) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[C_1:%.*]] = icmp sge i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: br i1 [[C_1]], label [[BB1:%.*]], label [[EXIT:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[C_2:%.*]] = icmp sge i32 [[Y]], [[Z:%.*]]
; CHECK-NEXT: br i1 [[C_2]], label [[BB2:%.*]], label [[EXIT]]
; CHECK: bb2:
; CHECK-NEXT: [[C_3:%.*]] = icmp sge i32 [[X]], [[A:%.*]]
; CHECK-NEXT: br i1 [[C_3]], label [[BB3:%.*]], label [[EXIT]]
; CHECK: bb3:
; CHECK-NEXT: ret i32 10
; CHECK: exit:
; CHECK-NEXT: ret i32 20
;
entry:
%c.1 = icmp sge i32 %x, %y
br i1 %c.1, label %bb1, label %exit
bb1:
%c.2 = icmp sge i32 %y, %z
br i1 %c.2, label %bb2, label %exit
bb2:
%c.3 = icmp sge i32 %x, %a
br i1 %c.3, label %bb3, label %exit
bb3:
ret i32 10
exit:
ret i32 20
}
define i32 @test3(i32 %x, i32 %y) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[C_1:%.*]] = icmp sge i32 [[X:%.*]], 10
; CHECK-NEXT: br i1 [[C_1]], label [[BB1:%.*]], label [[EXIT:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[C_2:%.*]] = icmp sge i32 [[Y:%.*]], 20
; CHECK-NEXT: br i1 [[C_2]], label [[BB2:%.*]], label [[EXIT]]
; CHECK: bb2:
; CHECK-NEXT: ret i32 10
; CHECK: exit:
; CHECK-NEXT: ret i32 20
;
entry:
%c.1 = icmp sge i32 %x, 10
br i1 %c.1, label %bb1, label %exit
bb1:
%c.2 = icmp sge i32 %y, 20
br i1 %c.2, label %bb2, label %exit
bb2:
ret i32 10
exit:
ret i32 20
}
define i32 @test4(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[C_1:%.*]] = icmp sge i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: br i1 [[C_1]], label [[BB1:%.*]], label [[EXIT:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[C_2:%.*]] = icmp sge i32 [[Y]], [[Z:%.*]]
; CHECK-NEXT: br i1 [[C_2]], label [[BB2:%.*]], label [[EXIT]]
; CHECK: bb2:
; CHECK-NEXT: [[T_1:%.*]] = icmp sge i32 [[X]], [[Z]]
; CHECK-NEXT: call void @use(i1 true)
; CHECK-NEXT: [[U_1:%.*]] = icmp eq i32 [[X]], [[Z]]
; CHECK-NEXT: call void @use(i1 [[U_1]])
; CHECK-NEXT: ret i32 10
; CHECK: exit:
; CHECK-NEXT: ret i32 20
;
entry:
%c.1 = icmp sge i32 %x, %y
br i1 %c.1, label %bb1, label %exit
bb1:
%c.2 = icmp sge i32 %y, %z
br i1 %c.2, label %bb2, label %exit
bb2:
%t.1 = icmp sge i32 %x, %z
call void @use(i1 %t.1)
%u.1 = icmp eq i32 %x, %z
call void @use(i1 %u.1)
ret i32 10
exit:
ret i32 20
}
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