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[InstSimplify] Fold min/max based on dominating condition

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If we have a dominating condition that x >= y, then umax(x, y) is x,
etc. I'm doing this in InstSimplify as the corresponding transform
for the select form is also done there.

Differential Revision: https://reviews.llvm.org/D87168
This commit is contained in:
Nikita Popov 2020-09-04 23:44:58 +02:00
parent ecd979f4bb
commit 1eb2ecc5c6
2 changed files with 21 additions and 28 deletions
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7
lib/Analysis/InstructionSimplify.cpp
View File

@ -5326,6 +5326,13 @@ static Value *simplifyBinaryIntrinsic(Function *F, Value *Op0, Value *Op1,
if (isICmpTrue(Pred, Op1, Op0, Q.getWithoutUndef(), RecursionLimit))
return Op1;
if (Optional<bool> Imp =
isImpliedByDomCondition(Pred, Op0, Op1, Q.CxtI, Q.DL))
return *Imp ? Op0 : Op1;
if (Optional<bool> Imp =
isImpliedByDomCondition(Pred, Op1, Op0, Q.CxtI, Q.DL))
return *Imp ? Op1 : Op0;
break;
}
case Intrinsic::usub_with_overflow:

42
test/Transforms/InstSimplify/maxmin_intrinsics.ll
View File

@ -2139,11 +2139,9 @@ define i8 @umax_dom_cond_uge(i8 %x, i8 %y) {
; CHECK-NEXT: [[CMP:%.*]] = icmp uge i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: br i1 [[CMP]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CHECK: true:
; CHECK-NEXT: [[M1:%.*]] = call i8 @llvm.umax.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M1]]
; CHECK-NEXT: ret i8 [[X]]
; CHECK: false:
; CHECK-NEXT: [[M2:%.*]] = call i8 @llvm.umax.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M2]]
; CHECK-NEXT: ret i8 [[Y]]
;
%cmp = icmp uge i8 %x, %y
br i1 %cmp, label %true, label %false
@ -2162,11 +2160,9 @@ define i8 @umax_dom_cond_ugt(i8 %x, i8 %y) {
; CHECK-NEXT: [[CMP:%.*]] = icmp ugt i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: br i1 [[CMP]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CHECK: true:
; CHECK-NEXT: [[M1:%.*]] = call i8 @llvm.umax.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M1]]
; CHECK-NEXT: ret i8 [[X]]
; CHECK: false:
; CHECK-NEXT: [[M2:%.*]] = call i8 @llvm.umax.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M2]]
; CHECK-NEXT: ret i8 [[Y]]
;
%cmp = icmp ugt i8 %x, %y
br i1 %cmp, label %true, label %false
@ -2185,11 +2181,9 @@ define i8 @umax_dom_cond_ule(i8 %x, i8 %y) {
; CHECK-NEXT: [[CMP:%.*]] = icmp ule i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: br i1 [[CMP]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CHECK: true:
; CHECK-NEXT: [[M1:%.*]] = call i8 @llvm.umax.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M1]]
; CHECK-NEXT: ret i8 [[Y]]
; CHECK: false:
; CHECK-NEXT: [[M2:%.*]] = call i8 @llvm.umax.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M2]]
; CHECK-NEXT: ret i8 [[X]]
;
%cmp = icmp ule i8 %x, %y
br i1 %cmp, label %true, label %false
@ -2208,11 +2202,9 @@ define i8 @umax_dom_cond_ult(i8 %x, i8 %y) {
; CHECK-NEXT: [[CMP:%.*]] = icmp ult i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: br i1 [[CMP]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CHECK: true:
; CHECK-NEXT: [[M1:%.*]] = call i8 @llvm.umax.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M1]]
; CHECK-NEXT: ret i8 [[Y]]
; CHECK: false:
; CHECK-NEXT: [[M2:%.*]] = call i8 @llvm.umax.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M2]]
; CHECK-NEXT: ret i8 [[X]]
;
%cmp = icmp ult i8 %x, %y
br i1 %cmp, label %true, label %false
@ -2231,11 +2223,9 @@ define i8 @umin_dom_cond_uge(i8 %x, i8 %y) {
; CHECK-NEXT: [[CMP:%.*]] = icmp uge i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: br i1 [[CMP]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CHECK: true:
; CHECK-NEXT: [[M1:%.*]] = call i8 @llvm.umin.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M1]]
; CHECK-NEXT: ret i8 [[Y]]
; CHECK: false:
; CHECK-NEXT: [[M2:%.*]] = call i8 @llvm.umin.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M2]]
; CHECK-NEXT: ret i8 [[X]]
;
%cmp = icmp uge i8 %x, %y
br i1 %cmp, label %true, label %false
@ -2254,11 +2244,9 @@ define i8 @smax_dom_cond_sge(i8 %x, i8 %y) {
; CHECK-NEXT: [[CMP:%.*]] = icmp sge i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: br i1 [[CMP]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CHECK: true:
; CHECK-NEXT: [[M1:%.*]] = call i8 @llvm.smax.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M1]]
; CHECK-NEXT: ret i8 [[X]]
; CHECK: false:
; CHECK-NEXT: [[M2:%.*]] = call i8 @llvm.smax.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M2]]
; CHECK-NEXT: ret i8 [[Y]]
;
%cmp = icmp sge i8 %x, %y
br i1 %cmp, label %true, label %false
@ -2277,11 +2265,9 @@ define i8 @smin_dom_cond_sge(i8 %x, i8 %y) {
; CHECK-NEXT: [[CMP:%.*]] = icmp sge i8 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: br i1 [[CMP]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CHECK: true:
; CHECK-NEXT: [[M1:%.*]] = call i8 @llvm.smin.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M1]]
; CHECK-NEXT: ret i8 [[Y]]
; CHECK: false:
; CHECK-NEXT: [[M2:%.*]] = call i8 @llvm.smin.i8(i8 [[X]], i8 [[Y]])
; CHECK-NEXT: ret i8 [[M2]]
; CHECK-NEXT: ret i8 [[X]]
;
%cmp = icmp sge i8 %x, %y
br i1 %cmp, label %true, label %false