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clang-p2996/llvm/test/Transforms/SCCP/ip-ranges-casts.ll
Florian Hahn f9d8e33c32 [SCCP] Turn sext into zext for non-negative ranges. 
This patch updates SCCP/IPSCCP to use the computed range info to turn
sexts into zexts, if the value is known to be non-negative. We already
to a similar transform in CorrelatedValuePropagation, but it seems like
we can catch a lot of additional cases by doing it in SCCP/IPSCCP as
well.

The transform is limited to ranges that are known to not include undef.

Currently constant ranges from conditions are treated as potentially
containing undef, due to PR46144. Once we flip this, the transform will
be more effective in practice.

Reviewers: efriedma, davide

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D81756
2020-06-19 10:17:55 +01:00

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; RUN: opt < %s -ipsccp -S | FileCheck %s
; x = [100, 301)
define internal i1 @f.trunc(i32 %x) {
; CHECK-LABEL: define internal i1 @f.trunc(i32 %x) {
; CHECK-NEXT: %t.1 = trunc i32 %x to i16
; CHECK-NEXT: %c.2 = icmp sgt i16 %t.1, 299
; CHECK-NEXT: %c.4 = icmp slt i16 %t.1, 101
; CHECK-NEXT: %res.1 = add i1 false, %c.2
; CHECK-NEXT: %res.2 = add i1 %res.1, false
; CHECK-NEXT: %res.3 = add i1 %res.2, %c.4
; CHECK-NEXT: %t.2 = trunc i32 %x to i8
; CHECK-NEXT: %c.5 = icmp sgt i8 %t.2, 44
; CHECK-NEXT: %c.6 = icmp sgt i8 %t.2, 43
; CHECK-NEXT: %c.7 = icmp slt i8 %t.2, 100
; CHECK-NEXT: %c.8 = icmp slt i8 %t.2, 101
; CHECK-NEXT: %res.4 = add i1 %res.3, %c.5
; CHECK-NEXT: %res.5 = add i1 %res.4, %c.6
; CHECK-NEXT: %res.6 = add i1 %res.5, %c.7
; CHECK-NEXT: %res.7 = add i1 %res.6, %c.8
; CHECK-NEXT: ret i1 %res.7
%t.1 = trunc i32 %x to i16
%c.1 = icmp sgt i16 %t.1, 300
%c.2 = icmp sgt i16 %t.1, 299
%c.3 = icmp slt i16 %t.1, 100
%c.4 = icmp slt i16 %t.1, 101
%res.1 = add i1 %c.1, %c.2
%res.2 = add i1 %res.1, %c.3
%res.3 = add i1 %res.2, %c.4
%t.2 = trunc i32 %x to i8
%c.5 = icmp sgt i8 %t.2, 300
%c.6 = icmp sgt i8 %t.2, 299
%c.7 = icmp slt i8 %t.2, 100
%c.8 = icmp slt i8 %t.2, 101
%res.4 = add i1 %res.3, %c.5
%res.5 = add i1 %res.4, %c.6
%res.6 = add i1 %res.5, %c.7
%res.7 = add i1 %res.6, %c.8
ret i1 %res.7
}
define i1 @caller1() {
; CHECK-LABEL: define i1 @caller1() {
; CHECK-NEXT: %call.1 = tail call i1 @f.trunc(i32 100)
; CHECK-NEXT: %call.2 = tail call i1 @f.trunc(i32 300)
; CHECK-NEXT: %res = and i1 %call.1, %call.2
; CHECK-NEXT: ret i1 %res
;
%call.1 = tail call i1 @f.trunc(i32 100)
%call.2 = tail call i1 @f.trunc(i32 300)
%res = and i1 %call.1, %call.2
ret i1 %res
}
; x = [100, 301)
define internal i1 @f.zext(i32 %x, i32 %y) {
; CHECK-LABEL: define internal i1 @f.zext(i32 %x, i32 %y) {
; CHECK-NEXT: %t.1 = zext i32 %x to i64
; CHECK-NEXT: %c.2 = icmp sgt i64 %t.1, 299
; CHECK-NEXT: %c.4 = icmp slt i64 %t.1, 101
; CHECK-NEXT: %res.1 = add i1 false, %c.2
; CHECK-NEXT: %res.2 = add i1 %res.1, false
; CHECK-NEXT: %res.3 = add i1 %res.2, %c.4
; CHECK-NEXT: %t.2 = zext i32 %y to i64
; CHECK-NEXT: %c.5 = icmp sgt i64 %t.2, 300
; CHECK-NEXT: %c.6 = icmp sgt i64 %t.2, 299
; CHECK-NEXT: %c.8 = icmp slt i64 %t.2, 1
; CHECK-NEXT: %res.4 = add i1 %res.3, %c.5
; CHECK-NEXT: %res.5 = add i1 %res.4, %c.6
; CHECK-NEXT: %res.6 = add i1 %res.5, false
; CHECK-NEXT: %res.7 = add i1 %res.6, %c.8
; CHECK-NEXT: ret i1 %res.7
%t.1 = zext i32 %x to i64
%c.1 = icmp sgt i64 %t.1, 300
%c.2 = icmp sgt i64 %t.1, 299
%c.3 = icmp slt i64 %t.1, 100
%c.4 = icmp slt i64 %t.1, 101
%res.1 = add i1 %c.1, %c.2
%res.2 = add i1 %res.1, %c.3
%res.3 = add i1 %res.2, %c.4
%t.2 = zext i32 %y to i64
%c.5 = icmp sgt i64 %t.2, 300
%c.6 = icmp sgt i64 %t.2, 299
%c.7 = icmp slt i64 %t.2, 0
%c.8 = icmp slt i64 %t.2, 1
%res.4 = add i1 %res.3, %c.5
%res.5 = add i1 %res.4, %c.6
%res.6 = add i1 %res.5, %c.7
%res.7 = add i1 %res.6, %c.8
ret i1 %res.7
}
define i1 @caller.zext() {
; CHECK-LABEL: define i1 @caller.zext() {
; CHECK-NEXT: %call.1 = tail call i1 @f.zext(i32 100, i32 -120)
; CHECK-NEXT: %call.2 = tail call i1 @f.zext(i32 300, i32 900)
; CHECK-NEXT: %res = and i1 %call.1, %call.2
; CHECK-NEXT: ret i1 %res
;
%call.1 = tail call i1 @f.zext(i32 100, i32 -120)
%call.2 = tail call i1 @f.zext(i32 300, i32 900)
%res = and i1 %call.1, %call.2
ret i1 %res
}
; x = [100, 301)
define internal i1 @f.sext(i32 %x, i32 %y) {
; CHECK-LABEL: define internal i1 @f.sext(i32 %x, i32 %y) {
; CHECK-NEXT: [[T_1:%.*]] = zext i32 %x to i64
; CHECK-NEXT: %c.2 = icmp sgt i64 [[T_1]], 299
; CHECK-NEXT: %c.4 = icmp slt i64 [[T_1]], 101
; CHECK-NEXT: %res.1 = add i1 false, %c.2
; CHECK-NEXT: %res.2 = add i1 %res.1, false
; CHECK-NEXT: %res.3 = add i1 %res.2, %c.4
; CHECK-NEXT: %t.2 = sext i32 %y to i64
; CHECK-NEXT: %c.6 = icmp sgt i64 %t.2, 899
; CHECK-NEXT: %c.8 = icmp slt i64 %t.2, -119
; CHECK-NEXT: %res.4 = add i1 %res.3, false
; CHECK-NEXT: %res.5 = add i1 %res.4, %c.6
; CHECK-NEXT: %res.6 = add i1 %res.5, false
; CHECK-NEXT: %res.7 = add i1 %res.6, %c.8
; CHECK-NEXT: ret i1 %res.7
;
%t.1 = sext i32 %x to i64
%c.1 = icmp sgt i64 %t.1, 300
%c.2 = icmp sgt i64 %t.1, 299
%c.3 = icmp slt i64 %t.1, 100
%c.4 = icmp slt i64 %t.1, 101
%res.1 = add i1 %c.1, %c.2
%res.2 = add i1 %res.1, %c.3
%res.3 = add i1 %res.2, %c.4
%t.2 = sext i32 %y to i64
%c.5 = icmp sgt i64 %t.2, 900
%c.6 = icmp sgt i64 %t.2, 899
%c.7 = icmp slt i64 %t.2, -120
%c.8 = icmp slt i64 %t.2, -119
%res.4 = add i1 %res.3, %c.5
%res.5 = add i1 %res.4, %c.6
%res.6 = add i1 %res.5, %c.7
%res.7 = add i1 %res.6, %c.8
ret i1 %res.7
}
define i1 @caller.sext() {
; CHECK-LABEL: define i1 @caller.sext() {
; CHECK-NEXT: %call.1 = tail call i1 @f.sext(i32 100, i32 -120)
; CHECK-NEXT: %call.2 = tail call i1 @f.sext(i32 300, i32 900)
; CHECK-NEXT: %res = and i1 %call.1, %call.2
; CHECK-NEXT: ret i1 %res
;
%call.1 = tail call i1 @f.sext(i32 100, i32 -120)
%call.2 = tail call i1 @f.sext(i32 300, i32 900)
%res = and i1 %call.1, %call.2
ret i1 %res
}
; There's nothing we can do besides going to the full range or overdefined.
define internal i1 @f.fptosi(i32 %x) {
; CHECK-LABEL: define internal i1 @f.fptosi(i32 %x) {
; CHECK-NEXT: %to.double = sitofp i32 %x to double
; CHECK-NEXT: %add = fadd double 0.000000e+00, %to.double
; CHECK-NEXT: %to.i32 = fptosi double %add to i32
; CHECK-NEXT: %c.1 = icmp sgt i32 %to.i32, 300
; CHECK-NEXT: %c.2 = icmp sgt i32 %to.i32, 299
; CHECK-NEXT: %c.3 = icmp slt i32 %to.i32, 100
; CHECK-NEXT: %c.4 = icmp slt i32 %to.i32, 101
; CHECK-NEXT: %res.1 = add i1 %c.1, %c.2
; CHECK-NEXT: %res.2 = add i1 %res.1, %c.3
; CHECK-NEXT: %res.3 = add i1 %res.2, %c.4
; CHECK-NEXT: ret i1 %res.3
;
%to.double = sitofp i32 %x to double
%add = fadd double 0.000000e+00, %to.double
%to.i32 = fptosi double %add to i32
%c.1 = icmp sgt i32 %to.i32, 300
%c.2 = icmp sgt i32 %to.i32, 299
%c.3 = icmp slt i32 %to.i32, 100
%c.4 = icmp slt i32 %to.i32, 101
%res.1 = add i1 %c.1, %c.2
%res.2 = add i1 %res.1, %c.3
%res.3 = add i1 %res.2, %c.4
ret i1 %res.3
}
define i1 @caller.fptosi() {
; CHECK-LABEL: define i1 @caller.fptosi() {
; CHECK-NEXT: %call.1 = tail call i1 @f.fptosi(i32 100)
; CHECK-NEXT: %call.2 = tail call i1 @f.fptosi(i32 300)
; CHECK-NEXT: %res = and i1 %call.1, %call.2
; CHECK-NEXT: ret i1 %res
;
%call.1 = tail call i1 @f.fptosi(i32 100)
%call.2 = tail call i1 @f.fptosi(i32 300)
%res = and i1 %call.1, %call.2
ret i1 %res
}
; There's nothing we can do besides going to the full range or overdefined.
define internal i1 @f.fpext(i16 %x) {
; CHECK-LABEL: define internal i1 @f.fpext(i16 %x) {
; CHECK-NEXT: %to.float = sitofp i16 %x to float
; CHECK-NEXT: %to.double = fpext float %to.float to double
; CHECK-NEXT: %to.i64 = fptoui float %to.float to i64
; CHECK-NEXT: %c.1 = icmp sgt i64 %to.i64, 300
; CHECK-NEXT: %c.2 = icmp sgt i64 %to.i64, 299
; CHECK-NEXT: %c.3 = icmp slt i64 %to.i64, 100
; CHECK-NEXT: %c.4 = icmp slt i64 %to.i64, 101
; CHECK-NEXT: %res.1 = add i1 %c.1, %c.2
; CHECK-NEXT: %res.2 = add i1 %res.1, %c.3
; CHECK-NEXT: %res.3 = add i1 %res.2, %c.4
; CHECK-NEXT: ret i1 %res.3
;
%to.float = sitofp i16 %x to float
%to.double = fpext float %to.float to double
%to.i64= fptoui float %to.float to i64
%c.1 = icmp sgt i64 %to.i64, 300
%c.2 = icmp sgt i64 %to.i64, 299
%c.3 = icmp slt i64 %to.i64, 100
%c.4 = icmp slt i64 %to.i64, 101
%res.1 = add i1 %c.1, %c.2
%res.2 = add i1 %res.1, %c.3
%res.3 = add i1 %res.2, %c.4
ret i1 %res.3
}
; There's nothing we can do besides going to the full range or overdefined.
define i1 @caller.fpext() {
; CHECK-LABEL: define i1 @caller.fpext() {
; CHECK-NEXT: %call.1 = tail call i1 @f.fpext(i16 100)
; CHECK-NEXT: %call.2 = tail call i1 @f.fpext(i16 300)
; CHECK-NEXT: %res = and i1 %call.1, %call.2
; CHECK-NEXT: ret i1 %res
;
%call.1 = tail call i1 @f.fpext(i16 100)
%call.2 = tail call i1 @f.fpext(i16 300)
%res = and i1 %call.1, %call.2
ret i1 %res
}
; There's nothing we can do besides going to the full range or overdefined.
define internal i1 @f.inttoptr.ptrtoint(i64 %x) {
; CHECK-LABEL: define internal i1 @f.inttoptr.ptrtoint(i64 %x) {
; CHECK-NEXT: %to.ptr = inttoptr i64 %x to i8*
; CHECK-NEXT: %to.i64 = ptrtoint i8* %to.ptr to i64
; CHECK-NEXT: %c.1 = icmp sgt i64 %to.i64, 300
; CHECK-NEXT: %c.2 = icmp sgt i64 %to.i64, 299
; CHECK-NEXT: %c.3 = icmp slt i64 %to.i64, 100
; CHECK-NEXT: %c.4 = icmp slt i64 %to.i64, 101
; CHECK-NEXT: %res.1 = add i1 %c.1, %c.2
; CHECK-NEXT: %res.2 = add i1 %res.1, %c.3
; CHECK-NEXT: %res.3 = add i1 %res.2, %c.4
; CHECK-NEXT: ret i1 %res.3
;
%to.ptr = inttoptr i64 %x to i8*
%to.i64 = ptrtoint i8* %to.ptr to i64
%c.1 = icmp sgt i64 %to.i64, 300
%c.2 = icmp sgt i64 %to.i64, 299
%c.3 = icmp slt i64 %to.i64, 100
%c.4 = icmp slt i64 %to.i64, 101
%res.1 = add i1 %c.1, %c.2
%res.2 = add i1 %res.1, %c.3
%res.3 = add i1 %res.2, %c.4
ret i1 %res.3
}
define i1 @caller.inttoptr.ptrtoint() {
; CHECK-LABEL: define i1 @caller.inttoptr.ptrtoint() {
; CHECK-NEXT: %call.1 = tail call i1 @f.inttoptr.ptrtoint(i64 100)
; CHECK-NEXT: %call.2 = tail call i1 @f.inttoptr.ptrtoint(i64 300)
; CHECK-NEXT: %res = and i1 %call.1, %call.2
; CHECK-NEXT: ret i1 %res
;
%call.1 = tail call i1 @f.inttoptr.ptrtoint(i64 100)
%call.2 = tail call i1 @f.inttoptr.ptrtoint(i64 300)
%res = and i1 %call.1, %call.2
ret i1 %res
}
; Make sure we do not create constant ranges for int to fp casts.
define i1 @int_range_to_double_cast(i32 %a) {
; CHECK-LABEL: define i1 @int_range_to_double_cast(i32 %a)
; CHECK-NEXT: %r = and i32 %a, 255
; CHECK-NEXT: %tmp4 = sitofp i32 %r to double
; CHECK-NEXT: %tmp10 = fadd double 0.000000e+00, %tmp4
; CHECK-NEXT: %tmp11 = fcmp olt double %tmp4, %tmp10
; CHECK-NEXT: ret i1 %tmp11
;
%r = and i32 %a, 255
%tmp4 = sitofp i32 %r to double
%tmp10 = fadd double 0.000000e+00, %tmp4
%tmp11 = fcmp olt double %tmp4, %tmp10
ret i1 %tmp11
}
; Make sure we do not use ranges to propagate info from vectors.
define i16 @vector_binop_and_cast() {
; CHECK-LABEL: define i16 @vector_binop_and_cast(
; CHECK-NEXT: entry:
; CHECK-NEXT: %vecinit7 = insertelement <8 x i16> <i16 undef, i16 1, i16 2, i16 3, i16 4, i16 5, i16 6, i16 7>, i16 undef, i32 0
; CHECK-NEXT: %rem = srem <8 x i16> <i16 2, i16 2, i16 2, i16 2, i16 2, i16 2, i16 2, i16 2>, %vecinit7
; CHECK-NEXT: %0 = bitcast <8 x i16> %rem to i128
; CHECK-NEXT: %1 = trunc i128 %0 to i16
; CHECK-NEXT: ret i16 %1
entry:
%vecinit7 = insertelement <8 x i16> <i16 undef, i16 1, i16 2, i16 3, i16 4, i16 5, i16 6, i16 7>, i16 undef, i32 0
%rem = srem <8 x i16> <i16 2, i16 2, i16 2, i16 2, i16 2, i16 2, i16 2, i16 2>, %vecinit7
%0 = bitcast <8 x i16> %rem to i128
%1 = trunc i128 %0 to i16
ret i16 %1
}
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