[InstCombine] Preserve profile after folding select instructions with conditionals #159666
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… conditionals If select simplification produces the transform: ``` (select A && B, T, F) -> (select A, T, F) ``` or ``` (select A || B, T, F) -> (select A, T, F) ``` it stands to reason that if the branches are the same, then the branch weights remain the same since the net effect is a simplification of the conditional. There are also cases where InstCombine negates the conditional (and therefore reverses the branches); this PR asserts that the branch weights are reversed in this case. Tracking issue: llvm#147390
llvmbot
added
llvm:instcombine
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@llvm/pr-subscribers-llvm-transforms Author: Alan Zhao (alanzhao1) ChangesIf or it stands to reason that if the branches are the same, then the branch weights remain the same since the net effect is a simplification of the conditional. There are also cases where InstCombine negates the conditional (and therefore reverses the branches); this PR asserts that the branch weights are reversed in this case. Tracking issue: #147390 Full diff: https://github.com/llvm/llvm-project/pull/159666.diff 4 Files Affected:
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
index 4ea75409252bd..b0513662628d5 100644
--- a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
+++ b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp
@@ -4521,8 +4521,20 @@ Instruction *InstCombinerImpl::visitSelectInst(SelectInst &SI) {
auto FoldSelectWithAndOrCond = [&](bool IsAnd, Value *A,
Value *B) -> Instruction * {
if (Value *V = simplifySelectInst(B, TrueVal, FalseVal,
- SQ.getWithInstruction(&SI)))
- return SelectInst::Create(A, IsAnd ? V : TrueVal, IsAnd ? FalseVal : V);
+ SQ.getWithInstruction(&SI))) {
+ Value *NewTrueVal = IsAnd ? V : TrueVal;
+ Value *NewFalseVal = IsAnd ? FalseVal : V;
+
+ // If the True and False values don't change, then preserve the branch
+ // metadata of the original select as the net effect of this change is to
+ // simplify the conditional.
+ Instruction *MDFrom = nullptr;
+ if (NewTrueVal == TrueVal && NewFalseVal == FalseVal) {
+ MDFrom = &SI;
+ }
+ return SelectInst::Create(A, NewTrueVal, NewFalseVal, "", nullptr,
+ MDFrom);
+ }
// Is (select B, T, F) a SPF?
if (CondVal->hasOneUse() && SelType->isIntOrIntVectorTy()) {
diff --git a/llvm/test/Transforms/InstCombine/select-and-cmp.ll b/llvm/test/Transforms/InstCombine/select-and-cmp.ll
index 50e1493cad5c7..0ac88372c8636 100644
--- a/llvm/test/Transforms/InstCombine/select-and-cmp.ll
+++ b/llvm/test/Transforms/InstCombine/select-and-cmp.ll
@@ -1,4 +1,4 @@
-; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
define i32 @select_and_icmp(i32 %x, i32 %y, i32 %z) {
@@ -114,34 +114,34 @@ define i32 @select_and_icmp_inv(i32 %x, i32 %y, i32 %z) {
; Below used to be negative tests in InstSimplify, but are no more negative cases here
-define i32 @select_and_icmp_pred_bad_1(i32 %x, i32 %y, i32 %z) {
+define i32 @select_and_icmp_pred_bad_1(i32 %x, i32 %y, i32 %z) !prof !0 {
; CHECK-LABEL: @select_and_icmp_pred_bad_1(
-; CHECK-NEXT: ret i32 [[X]]
+; CHECK-NEXT: ret i32 [[X:%.*]]
;
%A = icmp eq i32 %x, %z
%B = icmp ne i32 %y, %z
%C = and i1 %A, %B
- %D = select i1 %C, i32 %z, i32 %x
+ %D = select i1 %C, i32 %z, i32 %x, !prof !1
ret i32 %D
}
-define i32 @select_and_icmp_pred_bad_2(i32 %x, i32 %y, i32 %z) {
+define i32 @select_and_icmp_pred_bad_2(i32 %x, i32 %y, i32 %z) !prof !0 {
; CHECK-LABEL: @select_and_icmp_pred_bad_2(
; CHECK-NEXT: [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z:%.*]]
-; CHECK-NEXT: [[D:%.*]] = select i1 [[B]], i32 [[Z]], i32 [[X]]
+; CHECK-NEXT: [[D:%.*]] = select i1 [[B]], i32 [[Z]], i32 [[X:%.*]]
; CHECK-NEXT: ret i32 [[D]]
;
%A = icmp ne i32 %x, %z
%B = icmp eq i32 %y, %z
%C = and i1 %A, %B
- %D = select i1 %C, i32 %z, i32 %x
+ %D = select i1 %C, i32 %z, i32 %x, !prof !1
ret i32 %D
}
define i32 @select_and_icmp_pred_bad_3(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_and_icmp_pred_bad_3(
-; CHECK-NEXT: [[B_NOT:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT: [[D:%.*]] = select i1 [[B_NOT]], i32 [[X]], i32 [[Z]]
+; CHECK-NEXT: [[B_NOT:%.*]] = icmp eq i32 [[Y:%.*]], [[Z:%.*]]
+; CHECK-NEXT: [[D:%.*]] = select i1 [[B_NOT]], i32 [[X:%.*]], i32 [[Z]]
; CHECK-NEXT: ret i32 [[D]]
;
%A = icmp ne i32 %x, %z
@@ -153,8 +153,8 @@ define i32 @select_and_icmp_pred_bad_3(i32 %x, i32 %y, i32 %z) {
define i32 @select_and_icmp_pred_bad_4(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_and_icmp_pred_bad_4(
-; CHECK-NEXT: [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT: [[D:%.*]] = select i1 [[B]], i32 [[Z]], i32 [[X]]
+; CHECK-NEXT: [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z:%.*]]
+; CHECK-NEXT: [[D:%.*]] = select i1 [[B]], i32 [[Z]], i32 [[X:%.*]]
; CHECK-NEXT: ret i32 [[D]]
;
%A = icmp eq i32 %x, %z
@@ -166,7 +166,7 @@ define i32 @select_and_icmp_pred_bad_4(i32 %x, i32 %y, i32 %z) {
define i32 @select_and_icmp_alt_bad_1(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_and_icmp_alt_bad_1(
-; CHECK-NEXT: ret i32 [[Z]]
+; CHECK-NEXT: ret i32 [[Z:%.*]]
;
%A = icmp eq i32 %x, %z
%B = icmp ne i32 %y, %z
@@ -177,8 +177,8 @@ define i32 @select_and_icmp_alt_bad_1(i32 %x, i32 %y, i32 %z) {
define i32 @select_and_icmp_alt_bad_2(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_and_icmp_alt_bad_2(
-; CHECK-NEXT: [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT: [[D:%.*]] = select i1 [[B]], i32 [[X]], i32 [[Z]]
+; CHECK-NEXT: [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z:%.*]]
+; CHECK-NEXT: [[D:%.*]] = select i1 [[B]], i32 [[X:%.*]], i32 [[Z]]
; CHECK-NEXT: ret i32 [[D]]
;
%A = icmp ne i32 %x, %z
@@ -191,8 +191,8 @@ define i32 @select_and_icmp_alt_bad_2(i32 %x, i32 %y, i32 %z) {
define i32 @select_and_icmp_alt_bad_3(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_and_icmp_alt_bad_3(
-; CHECK-NEXT: [[B_NOT:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT: [[D:%.*]] = select i1 [[B_NOT]], i32 [[Z]], i32 [[X]]
+; CHECK-NEXT: [[B_NOT:%.*]] = icmp eq i32 [[Y:%.*]], [[Z:%.*]]
+; CHECK-NEXT: [[D:%.*]] = select i1 [[B_NOT]], i32 [[Z]], i32 [[X:%.*]]
; CHECK-NEXT: ret i32 [[D]]
;
%A = icmp ne i32 %x, %z
@@ -204,8 +204,8 @@ define i32 @select_and_icmp_alt_bad_3(i32 %x, i32 %y, i32 %z) {
define i32 @select_and_icmp_alt_bad_4(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_and_icmp_alt_bad_4(
-; CHECK-NEXT: [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT: [[D:%.*]] = select i1 [[B]], i32 [[X]], i32 [[Z]]
+; CHECK-NEXT: [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z:%.*]]
+; CHECK-NEXT: [[D:%.*]] = select i1 [[B]], i32 [[X:%.*]], i32 [[Z]]
; CHECK-NEXT: ret i32 [[D]]
;
%A = icmp eq i32 %x, %z
@@ -322,3 +322,10 @@ define i32 @select_and_icmp_alt_bad_false_val(i32 %x, i32 %y, i32 %z, i32 %k) {
%D = select i1 %C, i32 %x, i32 %k
ret i32 %D
}
+
+!0 = !{!"function_entry_count", i64 1000}
+!1 = !{!"branch_weights", i32 2, i32 3}
+
+;.
+; CHECK: [[META0:![0-9]+]] = !{!"function_entry_count", i64 1000}
+;.
diff --git a/llvm/test/Transforms/InstCombine/select-and-or.ll b/llvm/test/Transforms/InstCombine/select-and-or.ll
index 453ca666a7477..65e8500a5257b 100644
--- a/llvm/test/Transforms/InstCombine/select-and-or.ll
+++ b/llvm/test/Transforms/InstCombine/select-and-or.ll
@@ -1348,3 +1348,6 @@ define i8 @test_logical_commuted_and_ne_a_b(i1 %other_cond, i8 %a, i8 %b) {
%select = select i1 %or.cond, i8 %a, i8 %b
ret i8 %select
}
+
+!0 = !{!"function_entry_count", i64 1000}
+!1 = !{!"branch_weights", i32 2, i32 3}
diff --git a/llvm/test/Transforms/InstCombine/select-or-cmp.ll b/llvm/test/Transforms/InstCombine/select-or-cmp.ll
index 72a3747c5e405..82b069bc91e88 100644
--- a/llvm/test/Transforms/InstCombine/select-or-cmp.ll
+++ b/llvm/test/Transforms/InstCombine/select-or-cmp.ll
@@ -1,4 +1,4 @@
-; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
define i32 @select_or_icmp(i32 %x, i32 %y, i32 %z) {
@@ -114,47 +114,47 @@ define i32 @select_or_icmp_inv(i32 %x, i32 %y, i32 %z) {
; Below used to be negative tests in InstSimplify, but are no more negative cases here
-define i32 @select_and_icmp_pred_bad_1(i32 %x, i32 %y, i32 %z) {
+define i32 @select_and_icmp_pred_bad_1(i32 %x, i32 %y, i32 %z) !prof !0 {
; CHECK-LABEL: @select_and_icmp_pred_bad_1(
-; CHECK-NEXT: [[B_NOT:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT: [[D:%.*]] = select i1 [[B_NOT]], i32 [[X]], i32 [[Z]]
+; CHECK-NEXT: [[B_NOT:%.*]] = icmp eq i32 [[Y:%.*]], [[Z:%.*]]
+; CHECK-NEXT: [[D:%.*]] = select i1 [[B_NOT]], i32 [[X:%.*]], i32 [[Z]], !prof [[PROF1:![0-9]+]]
; CHECK-NEXT: ret i32 [[D]]
;
%A = icmp eq i32 %x, %z
%B = icmp ne i32 %y, %z
%C = or i1 %A, %B
- %D = select i1 %C, i32 %z, i32 %x
+ %D = select i1 %C, i32 %z, i32 %x, !prof !1
ret i32 %D
}
-define i32 @select_and_icmp_pred_bad_2(i32 %x, i32 %y, i32 %z) {
+define i32 @select_and_icmp_pred_bad_2(i32 %x, i32 %y, i32 %z) !prof !0 {
; CHECK-LABEL: @select_and_icmp_pred_bad_2(
-; CHECK-NEXT: ret i32 [[Z]]
+; CHECK-NEXT: ret i32 [[Z:%.*]]
;
%A = icmp ne i32 %x, %z
%B = icmp eq i32 %y, %z
%C = or i1 %A, %B
- %D = select i1 %C, i32 %z, i32 %x
+ %D = select i1 %C, i32 %z, i32 %x, !prof !1
ret i32 %D
}
-define i32 @select_and_icmp_pred_bad_3(i32 %x, i32 %y, i32 %z) {
+define i32 @select_and_icmp_pred_bad_3(i32 %x, i32 %y, i32 %z) !prof !0 {
; CHECK-LABEL: @select_and_icmp_pred_bad_3(
-; CHECK-NEXT: [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT: [[D:%.*]] = select i1 [[B]], i32 [[Z]], i32 [[X]]
+; CHECK-NEXT: [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z:%.*]]
+; CHECK-NEXT: [[D:%.*]] = select i1 [[B]], i32 [[Z]], i32 [[X:%.*]], !prof [[PROF2:![0-9]+]]
; CHECK-NEXT: ret i32 [[D]]
;
%A = icmp eq i32 %x, %z
%B = icmp eq i32 %y, %z
%C = or i1 %A, %B
- %D = select i1 %C, i32 %z, i32 %x
+ %D = select i1 %C, i32 %z, i32 %x, !prof !1
ret i32 %D
}
define i32 @select_and_icmp_pred_bad_4(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_and_icmp_pred_bad_4(
-; CHECK-NEXT: [[B_NOT:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT: [[D:%.*]] = select i1 [[B_NOT]], i32 [[X]], i32 [[Z]]
+; CHECK-NEXT: [[B_NOT:%.*]] = icmp eq i32 [[Y:%.*]], [[Z:%.*]]
+; CHECK-NEXT: [[D:%.*]] = select i1 [[B_NOT]], i32 [[X:%.*]], i32 [[Z]]
; CHECK-NEXT: ret i32 [[D]]
;
%A = icmp ne i32 %x, %z
@@ -166,8 +166,8 @@ define i32 @select_and_icmp_pred_bad_4(i32 %x, i32 %y, i32 %z) {
define i32 @select_or_icmp_alt_bad_1(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_or_icmp_alt_bad_1(
-; CHECK-NEXT: [[B_NOT:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT: [[D:%.*]] = select i1 [[B_NOT]], i32 [[Z]], i32 [[X]]
+; CHECK-NEXT: [[B_NOT:%.*]] = icmp eq i32 [[Y:%.*]], [[Z:%.*]]
+; CHECK-NEXT: [[D:%.*]] = select i1 [[B_NOT]], i32 [[Z]], i32 [[X:%.*]]
; CHECK-NEXT: ret i32 [[D]]
;
%A = icmp eq i32 %x, %z
@@ -179,7 +179,7 @@ define i32 @select_or_icmp_alt_bad_1(i32 %x, i32 %y, i32 %z) {
define i32 @select_or_icmp_alt_bad_2(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_or_icmp_alt_bad_2(
-; CHECK-NEXT: ret i32 [[X]]
+; CHECK-NEXT: ret i32 [[X:%.*]]
;
%A = icmp ne i32 %x, %z
%B = icmp eq i32 %y, %z
@@ -190,8 +190,8 @@ define i32 @select_or_icmp_alt_bad_2(i32 %x, i32 %y, i32 %z) {
define i32 @select_or_icmp_alt_bad_3(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_or_icmp_alt_bad_3(
-; CHECK-NEXT: [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT: [[D:%.*]] = select i1 [[B]], i32 [[X]], i32 [[Z]]
+; CHECK-NEXT: [[B:%.*]] = icmp eq i32 [[Y:%.*]], [[Z:%.*]]
+; CHECK-NEXT: [[D:%.*]] = select i1 [[B]], i32 [[X:%.*]], i32 [[Z]]
; CHECK-NEXT: ret i32 [[D]]
;
%A = icmp eq i32 %x, %z
@@ -203,8 +203,8 @@ define i32 @select_or_icmp_alt_bad_3(i32 %x, i32 %y, i32 %z) {
define i32 @select_or_icmp_alt_bad_4(i32 %x, i32 %y, i32 %z) {
; CHECK-LABEL: @select_or_icmp_alt_bad_4(
-; CHECK-NEXT: [[B_NOT:%.*]] = icmp eq i32 [[Y:%.*]], [[Z]]
-; CHECK-NEXT: [[D:%.*]] = select i1 [[B_NOT]], i32 [[Z]], i32 [[X]]
+; CHECK-NEXT: [[B_NOT:%.*]] = icmp eq i32 [[Y:%.*]], [[Z:%.*]]
+; CHECK-NEXT: [[D:%.*]] = select i1 [[B_NOT]], i32 [[Z]], i32 [[X:%.*]]
; CHECK-NEXT: ret i32 [[D]]
;
%A = icmp ne i32 %x, %z
@@ -321,3 +321,11 @@ define i32 @select_or_icmp_alt_bad_false_val(i32 %x, i32 %y, i32 %z, i32 %k) {
%D = select i1 %C, i32 %x, i32 %k
ret i32 %D
}
+
+!0 = !{!"function_entry_count", i64 1000}
+!1 = !{!"branch_weights", i32 2, i32 3}
+;.
+; CHECK: [[META0:![0-9]+]] = !{!"function_entry_count", i64 1000}
+; CHECK: [[PROF1]] = !{!"branch_weights", i32 3, i32 2}
+; CHECK: [[PROF2]] = !{!"branch_weights", i32 2, i32 3}
+;.
|
mtrofin
reviewed
Sep 24, 2025
mtrofin
approved these changes
Sep 24, 2025
|
ping @nikic any comments? |
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Reverted to unbreak the CI, feel free to reland with a fix! |
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Oct 3, 2025
…t instructions with conditionals" (#161885) Reverts llvm/llvm-project#159666 Many bots are broken right now.
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Oct 3, 2025
…ions with conditionals" (llvm#161885) This reverts commit 572b579. This is a reland of llvm#159666 but with a fix moving the `extern` declaration of the flag under the LLVM namespace, which is needed to fix a linker error caused by llvm#161240.
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/129/builds/30829 Here is the relevant piece of the build log for the reference |
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/160/builds/26019 Here is the relevant piece of the build log for the reference |
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LLVM Buildbot has detected a new failure on builder Full details are available at: https://lab.llvm.org/buildbot/#/builders/180/builds/26159 Here is the relevant piece of the build log for the reference |
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If
selectsimplification produces the transform:or
it stands to reason that if the branches are the same, then the branch weights remain the same since the net effect is a simplification of the conditional.
There are also cases where InstCombine negates the conditional (and therefore reverses the branches); this PR asserts that the branch weights are reversed in this case.
Tracking issue: #147390