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clang-p2996/llvm/test/Analysis/ValueTracking/phi-known-bits.ll
Noah Goldstein 7c9fe735d4 [ValueTracking] Strengthen analysis in computeKnownBits of phi 
Use the comparison based analysis to strengthen the standard
knownbits analysis rather than choosing either/or.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D157807
2023-08-22 10:59:03 -05:00

427 lines
10 KiB
LLVM
Raw Blame History

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=instcombine < %s -S | FileCheck %s
define i8 @phi_ugt_high_bits(i8 %x) {
; CHECK-LABEL: @phi_ugt_high_bits(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt i8 [[X:%.*]], -65
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: ret i8 64
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp ugt i8 %x, 191
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [-1, %F]
%r = and i8 %v, 64
ret i8 %r
F:
br label %T
}
define i8 @phi_ult_low_bits(i8 %x) {
; CHECK-LABEL: @phi_ult_low_bits(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i8 [[X:%.*]], -64
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: br label [[F]]
; CHECK: F:
; CHECK-NEXT: ret i8 64
;
entry:
%cmp = icmp ult i8 %x, 192
br i1 %cmp, label %T, label %F
T:
br label %F
F:
%v = phi i8 [ %x, %entry], [-1, %T]
%r = and i8 %v, 64
ret i8 %r
}
define i8 @phi_ugt_high_bits_fail(i8 %x) {
; CHECK-LABEL: @phi_ugt_high_bits_fail(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt i8 [[X:%.*]], -66
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: [[V:%.*]] = phi i8 [ [[X]], [[ENTRY:%.*]] ], [ -1, [[F]] ]
; CHECK-NEXT: [[R:%.*]] = and i8 [[V]], 64
; CHECK-NEXT: ret i8 [[R]]
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp ugt i8 %x, 190
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [-1, %F]
%r = and i8 %v, 64
ret i8 %r
F:
br label %T
}
define i8 @phi_uge_high_bits(i8 %x) {
; CHECK-LABEL: @phi_uge_high_bits(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt i8 [[X:%.*]], -65
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: ret i8 64
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp uge i8 %x, 192
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [-1, %F]
%r = and i8 %v, 64
ret i8 %r
F:
br label %T
}
define i8 @phi_uge_high_bits_fail(i8 %x) {
; CHECK-LABEL: @phi_uge_high_bits_fail(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt i8 [[X:%.*]], 5
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: [[V:%.*]] = phi i8 [ [[X]], [[ENTRY:%.*]] ], [ -1, [[F]] ]
; CHECK-NEXT: [[R:%.*]] = and i8 [[V]], 1
; CHECK-NEXT: ret i8 [[R]]
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp ugt i8 %x, 5
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [-1, %F]
%r = and i8 %v, 1
ret i8 %r
F:
br label %T
}
define i8 @phi_sge_high_bits(i8 %x) {
; CHECK-LABEL: @phi_sge_high_bits(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i8 [[X:%.*]], 95
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: ret i8 96
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp sge i8 %x, 96
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [-1, %F]
%r = and i8 %v, 96
ret i8 %r
F:
br label %T
}
define i8 @phi_sge_high_bits_fail(i8 %x) {
; CHECK-LABEL: @phi_sge_high_bits_fail(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i8 [[X:%.*]], -2
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: [[V:%.*]] = phi i8 [ [[X]], [[ENTRY:%.*]] ], [ -1, [[F]] ]
; CHECK-NEXT: [[R:%.*]] = and i8 [[V]], 1
; CHECK-NEXT: ret i8 [[R]]
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp sge i8 %x, -1
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [-1, %F]
%r = and i8 %v, 1
ret i8 %r
F:
br label %T
}
define i8 @phi_sgt_high_bits(i8 %x) {
; CHECK-LABEL: @phi_sgt_high_bits(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i8 [[X:%.*]], -1
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: ret i8 0
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp sgt i8 %x, -1
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [0, %F]
%r = and i8 %v, 128
ret i8 %r
F:
br label %T
}
define i8 @phi_sgt_high_bits2(i8 %x) {
; CHECK-LABEL: @phi_sgt_high_bits2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i8 [[X:%.*]], 63
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: ret i8 64
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp sgt i8 %x, 63
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [-1, %F]
%r = and i8 %v, 64
ret i8 %r
F:
br label %T
}
define i8 @phi_sgt_high_bits_fail(i8 %x) {
; CHECK-LABEL: @phi_sgt_high_bits_fail(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp sgt i8 [[X:%.*]], 62
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: [[V:%.*]] = phi i8 [ [[X]], [[ENTRY:%.*]] ], [ -1, [[F]] ]
; CHECK-NEXT: [[R:%.*]] = and i8 [[V]], 64
; CHECK-NEXT: ret i8 [[R]]
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp sgt i8 %x, 62
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [-1, %F]
%r = and i8 %v, 64
ret i8 %r
F:
br label %T
}
define i8 @phi_slt_high_bits(i8 %x) {
; CHECK-LABEL: @phi_slt_high_bits(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[X:%.*]], 0
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: ret i8 -128
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp slt i8 %x, 0
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [-1, %F]
%r = and i8 %v, 128
ret i8 %r
F:
br label %T
}
define i8 @phi_slt_high_bits2(i8 %x) {
; CHECK-LABEL: @phi_slt_high_bits2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[X:%.*]], -64
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: ret i8 0
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp slt i8 %x, -64
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [0, %F]
%r = and i8 %v, 64
ret i8 %r
F:
br label %T
}
define i8 @phi_slt_high_bits_fail(i8 %x) {
; CHECK-LABEL: @phi_slt_high_bits_fail(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[X:%.*]], -63
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: [[V:%.*]] = phi i8 [ [[X]], [[ENTRY:%.*]] ], [ 0, [[F]] ]
; CHECK-NEXT: [[R:%.*]] = and i8 [[V]], 64
; CHECK-NEXT: ret i8 [[R]]
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp slt i8 %x, -63
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [0, %F]
%r = and i8 %v, 64
ret i8 %r
F:
br label %T
}
define i8 @phi_sle_high_bits(i8 %x) {
; CHECK-LABEL: @phi_sle_high_bits(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[X:%.*]], -64
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: ret i8 0
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp sle i8 %x, -65
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [0, %F]
%r = and i8 %v, 64
ret i8 %r
F:
br label %T
}
define i8 @phi_sle_low_bits(i8 %x) {
; CHECK-LABEL: @phi_sle_low_bits(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[X:%.*]], 65
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: br label [[F]]
; CHECK: F:
; CHECK-NEXT: ret i8 64
;
entry:
%cmp = icmp sle i8 %x, 64
br i1 %cmp, label %T, label %F
T:
br label %F
F:
%v = phi i8 [ %x, %entry], [-1, %T]
%r = and i8 %v, 64
ret i8 %r
}
define i8 @phi_sle_high_bits_fail(i8 %x) {
; CHECK-LABEL: @phi_sle_high_bits_fail(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[X:%.*]], 1
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: [[V:%.*]] = phi i8 [ [[X]], [[ENTRY:%.*]] ], [ -1, [[F]] ]
; CHECK-NEXT: [[R:%.*]] = and i8 [[V]], -128
; CHECK-NEXT: ret i8 [[R]]
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp sle i8 %x, 0
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [-1, %F]
%r = and i8 %v, 128
ret i8 %r
F:
br label %T
}
define i8 @phi_sle_high_bits_fail2(i8 %x) {
; CHECK-LABEL: @phi_sle_high_bits_fail2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp slt i8 [[X:%.*]], -63
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: [[V:%.*]] = phi i8 [ [[X]], [[ENTRY:%.*]] ], [ -1, [[F]] ]
; CHECK-NEXT: [[R:%.*]] = and i8 [[V]], 64
; CHECK-NEXT: ret i8 [[R]]
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%cmp = icmp sle i8 %x, -64
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [-1, %F]
%r = and i8 %v, 64
ret i8 %r
F:
br label %T
}
define i8 @phi_ugt_high_bits_and_known(i8 %xx) {
; CHECK-LABEL: @phi_ugt_high_bits_and_known(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt i8 [[XX:%.*]], -65
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: ret i8 65
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%x = or i8 %xx, 1
%cmp = icmp ugt i8 %x, 191
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [-1, %F]
%r = and i8 %v, 65
ret i8 %r
F:
br label %T
}
define i8 @phi_ugt_high_bits_and_known_todo_high_depths(i8 %xx, i8 %y, i8 %z) {
; CHECK-LABEL: @phi_ugt_high_bits_and_known_todo_high_depths(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[YY:%.*]] = and i8 [[Y:%.*]], -2
; CHECK-NEXT: [[XXX:%.*]] = and i8 [[YY]], [[XX:%.*]]
; CHECK-NEXT: [[ZZ:%.*]] = or i8 [[Z:%.*]], 1
; CHECK-NEXT: [[X:%.*]] = add i8 [[XXX]], [[ZZ]]
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt i8 [[X]], -65
; CHECK-NEXT: br i1 [[CMP]], label [[T:%.*]], label [[F:%.*]]
; CHECK: T:
; CHECK-NEXT: [[V:%.*]] = phi i8 [ [[X]], [[ENTRY:%.*]] ], [ -1, [[F]] ]
; CHECK-NEXT: [[R:%.*]] = and i8 [[V]], 65
; CHECK-NEXT: ret i8 [[R]]
; CHECK: F:
; CHECK-NEXT: br label [[T]]
;
entry:
%yy = and i8 %y, -2
%xxx = and i8 %xx, %yy
%zz = or i8 %z, 1
%x = add i8 %xxx, %zz
%cmp = icmp ugt i8 %x, 191
br i1 %cmp, label %T, label %F
T:
%v = phi i8 [ %x, %entry], [-1, %F]
%r = and i8 %v, 65
ret i8 %r
F:
br label %T
}
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