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clang-p2996/llvm/test/Transforms/InstCombine/select-safe-impliedcond-transforms.ll
Philip Reames e6ad9ef4e7 [instcombine] Canonicalize constant index type to i64 for extractelement/insertelement 
The basic idea to this is that a) having a single canonical type makes CSE easier, and b) many of our transforms are inconsistent about which types we end up with based on visit order.

I'm restricting this to constants as for non-constants, we'd have to decide whether the simplicity was worth extra instructions. For constants, there are no extra instructions.

We chose the canonical type as i64 arbitrarily.  We might consider changing this to something else in the future if we have cause.

Differential Revision: https://reviews.llvm.org/D115387
2021-12-13 16:56:22 -08:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
define i1 @a_true_implies_b_true(i8 %z, i1 %X, i1 %Y) {
; CHECK-LABEL: @a_true_implies_b_true(
; CHECK-NEXT: [[A:%.*]] = icmp ugt i8 [[Z:%.*]], 20
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A]], i1 [[X:%.*]], i1 false
; CHECK-NEXT: ret i1 [[RES]]
;
%a = icmp ugt i8 %z, 20
%b = icmp ugt i8 %z, 10
%sel = select i1 %b, i1 %X, i1 %Y
%res = select i1 %a, i1 %sel, i1 false
ret i1 %res
}
define <2 x i1> @a_true_implies_b_true_vec(i8 %z0, <2 x i1> %X, <2 x i1> %Y) {
; CHECK-LABEL: @a_true_implies_b_true_vec(
; CHECK-NEXT: [[A0:%.*]] = insertelement <2 x i8> poison, i8 [[Z0:%.*]], i64 0
; CHECK-NEXT: [[Z:%.*]] = shufflevector <2 x i8> [[A0]], <2 x i8> poison, <2 x i32> zeroinitializer
; CHECK-NEXT: [[A:%.*]] = icmp ugt <2 x i8> [[Z]], <i8 20, i8 19>
; CHECK-NEXT: [[B:%.*]] = icmp ugt i8 [[Z0]], 10
; CHECK-NEXT: [[SEL:%.*]] = select i1 [[B]], <2 x i1> [[X:%.*]], <2 x i1> [[Y:%.*]]
; CHECK-NEXT: [[RES:%.*]] = select <2 x i1> [[A]], <2 x i1> [[SEL]], <2 x i1> zeroinitializer
; CHECK-NEXT: ret <2 x i1> [[RES]]
;
%a0 = insertelement <2 x i8> poison, i8 %z0, i8 0
%z = shufflevector <2 x i8> %a0, <2 x i8> poison, <2 x i32> zeroinitializer
%a = icmp ugt <2 x i8> %z, <i8 20, i8 19>
%b = icmp ugt i8 %z0, 10
%sel = select i1 %b, <2 x i1> %X, <2 x i1> %Y
%res = select <2 x i1> %a, <2 x i1> %sel, <2 x i1> zeroinitializer
ret <2 x i1> %res
}
define i1 @a_true_implies_b_true2(i8 %z, i1 %X, i1 %Y) {
; CHECK-LABEL: @a_true_implies_b_true2(
; CHECK-NEXT: [[A:%.*]] = icmp ugt i8 [[Z:%.*]], 20
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A]], i1 [[X:%.*]], i1 false
; CHECK-NEXT: ret i1 [[RES]]
;
%a = icmp ugt i8 %z, 20
%b = icmp ugt i8 %z, 10
%sel = select i1 %b, i1 %X, i1 %Y
%res = and i1 %a, %sel
ret i1 %res
}
define i1 @a_true_implies_b_true2_comm(i8 %z, i1 %X, i1 %Y) {
; CHECK-LABEL: @a_true_implies_b_true2_comm(
; CHECK-NEXT: [[A:%.*]] = icmp ugt i8 [[Z:%.*]], 20
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A]], i1 [[X:%.*]], i1 false
; CHECK-NEXT: ret i1 [[RES]]
;
%a = icmp ugt i8 %z, 20
%b = icmp ugt i8 %z, 10
%sel = select i1 %b, i1 %X, i1 %Y
%res = and i1 %sel, %a
ret i1 %res
}
define i1 @a_true_implies_b_false(i8 %z, i1 %X, i1 %Y) {
; CHECK-LABEL: @a_true_implies_b_false(
; CHECK-NEXT: [[A:%.*]] = icmp ugt i8 [[Z:%.*]], 20
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A]], i1 [[Y:%.*]], i1 false
; CHECK-NEXT: ret i1 [[RES]]
;
%a = icmp ugt i8 %z, 20
%b = icmp ult i8 %z, 10
%sel = select i1 %b, i1 %X, i1 %Y
%res = select i1 %a, i1 %sel, i1 false
ret i1 %res
}
define i1 @a_true_implies_b_false2(i8 %z, i1 %X, i1 %Y) {
; CHECK-LABEL: @a_true_implies_b_false2(
; CHECK-NEXT: [[A:%.*]] = icmp ugt i8 [[Z:%.*]], 20
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A]], i1 [[Y:%.*]], i1 false
; CHECK-NEXT: ret i1 [[RES]]
;
%a = icmp ugt i8 %z, 20
%b = icmp eq i8 %z, 10
%sel = select i1 %b, i1 %X, i1 %Y
%res = and i1 %a, %sel
ret i1 %res
}
define i1 @a_true_implies_b_false2_comm(i8 %z, i1 %X, i1 %Y) {
; CHECK-LABEL: @a_true_implies_b_false2_comm(
; CHECK-NEXT: [[A:%.*]] = icmp ugt i8 [[Z:%.*]], 20
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A]], i1 [[Y:%.*]], i1 false
; CHECK-NEXT: ret i1 [[RES]]
;
%a = icmp ugt i8 %z, 20
%b = icmp eq i8 %z, 10
%sel = select i1 %b, i1 %X, i1 %Y
%res = and i1 %sel, %a
ret i1 %res
}
define i1 @a_false_implies_b_true(i8 %z, i1 %X, i1 %Y) {
; CHECK-LABEL: @a_false_implies_b_true(
; CHECK-NEXT: [[A:%.*]] = icmp ugt i8 [[Z:%.*]], 10
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A]], i1 true, i1 [[X:%.*]]
; CHECK-NEXT: ret i1 [[RES]]
;
%a = icmp ugt i8 %z, 10
%b = icmp ult i8 %z, 20
%sel = select i1 %b, i1 %X, i1 %Y
%res = select i1 %a, i1 true, i1 %sel
ret i1 %res
}
define i1 @a_false_implies_b_true2(i8 %z, i1 %X, i1 %Y) {
; CHECK-LABEL: @a_false_implies_b_true2(
; CHECK-NEXT: [[A:%.*]] = icmp ugt i8 [[Z:%.*]], 10
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A]], i1 true, i1 [[X:%.*]]
; CHECK-NEXT: ret i1 [[RES]]
;
%a = icmp ugt i8 %z, 10
%b = icmp ult i8 %z, 20
%sel = select i1 %b, i1 %X, i1 %Y
%res = or i1 %a, %sel
ret i1 %res
}
define i1 @a_false_implies_b_true2_comm(i8 %z, i1 %X, i1 %Y) {
; CHECK-LABEL: @a_false_implies_b_true2_comm(
; CHECK-NEXT: [[A:%.*]] = icmp ugt i8 [[Z:%.*]], 10
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A]], i1 true, i1 [[X:%.*]]
; CHECK-NEXT: ret i1 [[RES]]
;
%a = icmp ugt i8 %z, 10
%b = icmp ult i8 %z, 20
%sel = select i1 %b, i1 %X, i1 %Y
%res = or i1 %sel, %a
ret i1 %res
}
define i1 @a_false_implies_b_false(i8 %z, i1 %X, i1 %Y) {
; CHECK-LABEL: @a_false_implies_b_false(
; CHECK-NEXT: [[A:%.*]] = icmp ugt i8 [[Z:%.*]], 10
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A]], i1 true, i1 [[Y:%.*]]
; CHECK-NEXT: ret i1 [[RES]]
;
%a = icmp ugt i8 %z, 10
%b = icmp ugt i8 %z, 20
%sel = select i1 %b, i1 %X, i1 %Y
%res = select i1 %a, i1 true, i1 %sel
ret i1 %res
}
define i1 @a_false_implies_b_false2(i8 %z, i1 %X, i1 %Y) {
; CHECK-LABEL: @a_false_implies_b_false2(
; CHECK-NEXT: [[A:%.*]] = icmp ugt i8 [[Z:%.*]], 10
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A]], i1 true, i1 [[Y:%.*]]
; CHECK-NEXT: ret i1 [[RES]]
;
%a = icmp ugt i8 %z, 10
%b = icmp ugt i8 %z, 20
%sel = select i1 %b, i1 %X, i1 %Y
%res = or i1 %a, %sel
ret i1 %res
}
define i1 @a_false_implies_b_false2_comm(i8 %z, i1 %X, i1 %Y) {
; CHECK-LABEL: @a_false_implies_b_false2_comm(
; CHECK-NEXT: [[A:%.*]] = icmp ugt i8 [[Z:%.*]], 10
; CHECK-NEXT: [[RES:%.*]] = select i1 [[A]], i1 true, i1 [[Y:%.*]]
; CHECK-NEXT: ret i1 [[RES]]
;
%a = icmp ugt i8 %z, 10
%b = icmp ugt i8 %z, 20
%sel = select i1 %b, i1 %X, i1 %Y
%res = or i1 %sel, %a
ret i1 %res
}
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