099e4bcd5d
We cannot leak any equivalency information by comparing against null since null never has virtual metadata associated with it (when null is not a valid dereferenceable pointer). Instcombine seems to make sure that a null will be on the RHS, so we don't have to check both operands. This fixes a missed optimization in llvm-test-suite's MultiSource lambda benchmark under -fstrict-vtable-pointers. Reviewed By: Prazek Differential Revision: https://reviews.llvm.org/D108734
235 lines
8.0 KiB
LLVM
235 lines
8.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -instcombine -early-cse -earlycse-debug-hash -S < %s | FileCheck %s
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define i8* @simplifyNullLaunder() {
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; CHECK-LABEL: @simplifyNullLaunder(
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; CHECK-NEXT: ret i8* null
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;
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%b2 = call i8* @llvm.launder.invariant.group.p0i8(i8* null)
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ret i8* %b2
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}
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define i8* @dontSimplifyNullLaunderNoNullOpt() #0 {
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; CHECK-LABEL: @dontSimplifyNullLaunderNoNullOpt(
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; CHECK-NEXT: [[B2:%.*]] = call i8* @llvm.launder.invariant.group.p0i8(i8* null)
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; CHECK-NEXT: ret i8* [[B2]]
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;
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%b2 = call i8* @llvm.launder.invariant.group.p0i8(i8* null)
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ret i8* %b2
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}
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define i8 addrspace(42)* @dontsimplifyNullLaunderForDifferentAddrspace() {
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; CHECK-LABEL: @dontsimplifyNullLaunderForDifferentAddrspace(
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; CHECK-NEXT: [[B2:%.*]] = call i8 addrspace(42)* @llvm.launder.invariant.group.p42i8(i8 addrspace(42)* null)
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; CHECK-NEXT: ret i8 addrspace(42)* [[B2]]
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;
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%b2 = call i8 addrspace(42)* @llvm.launder.invariant.group.p42i8(i8 addrspace(42)* null)
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ret i8 addrspace(42)* %b2
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}
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define i8* @simplifyUndefLaunder() {
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; CHECK-LABEL: @simplifyUndefLaunder(
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; CHECK-NEXT: ret i8* undef
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;
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%b2 = call i8* @llvm.launder.invariant.group.p0i8(i8* undef)
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ret i8* %b2
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}
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define i8 addrspace(42)* @simplifyUndefLaunder2() {
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; CHECK-LABEL: @simplifyUndefLaunder2(
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; CHECK-NEXT: ret i8 addrspace(42)* undef
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;
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%b2 = call i8 addrspace(42)* @llvm.launder.invariant.group.p42i8(i8 addrspace(42)* undef)
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ret i8 addrspace(42)* %b2
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}
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define i8* @simplifyNullStrip() {
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; CHECK-LABEL: @simplifyNullStrip(
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; CHECK-NEXT: ret i8* null
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;
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%b2 = call i8* @llvm.strip.invariant.group.p0i8(i8* null)
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ret i8* %b2
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}
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define i8* @dontSimplifyNullStripNonNullOpt() #0 {
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; CHECK-LABEL: @dontSimplifyNullStripNonNullOpt(
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; CHECK-NEXT: [[B2:%.*]] = call i8* @llvm.strip.invariant.group.p0i8(i8* null)
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; CHECK-NEXT: ret i8* [[B2]]
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;
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%b2 = call i8* @llvm.strip.invariant.group.p0i8(i8* null)
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ret i8* %b2
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}
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define i8 addrspace(42)* @dontsimplifyNullStripForDifferentAddrspace() {
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; CHECK-LABEL: @dontsimplifyNullStripForDifferentAddrspace(
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; CHECK-NEXT: [[B2:%.*]] = call i8 addrspace(42)* @llvm.strip.invariant.group.p42i8(i8 addrspace(42)* null)
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; CHECK-NEXT: ret i8 addrspace(42)* [[B2]]
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;
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%b2 = call i8 addrspace(42)* @llvm.strip.invariant.group.p42i8(i8 addrspace(42)* null)
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ret i8 addrspace(42)* %b2
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}
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define i8* @simplifyUndefStrip() {
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; CHECK-LABEL: @simplifyUndefStrip(
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; CHECK-NEXT: ret i8* undef
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;
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%b2 = call i8* @llvm.strip.invariant.group.p0i8(i8* undef)
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ret i8* %b2
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}
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define i8 addrspace(42)* @simplifyUndefStrip2() {
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; CHECK-LABEL: @simplifyUndefStrip2(
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; CHECK-NEXT: ret i8 addrspace(42)* undef
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;
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%b2 = call i8 addrspace(42)* @llvm.strip.invariant.group.p42i8(i8 addrspace(42)* undef)
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ret i8 addrspace(42)* %b2
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}
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define i8* @simplifyLaunderOfLaunder(i8* %a) {
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; CHECK-LABEL: @simplifyLaunderOfLaunder(
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; CHECK-NEXT: [[TMP1:%.*]] = call i8* @llvm.launder.invariant.group.p0i8(i8* [[A:%.*]])
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; CHECK-NEXT: ret i8* [[TMP1]]
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;
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%a2 = call i8* @llvm.launder.invariant.group.p0i8(i8* %a)
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%a3 = call i8* @llvm.launder.invariant.group.p0i8(i8* %a2)
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ret i8* %a3
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}
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define i8* @simplifyStripOfLaunder(i8* %a) {
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; CHECK-LABEL: @simplifyStripOfLaunder(
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; CHECK-NEXT: [[TMP1:%.*]] = call i8* @llvm.strip.invariant.group.p0i8(i8* [[A:%.*]])
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; CHECK-NEXT: ret i8* [[TMP1]]
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;
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%a2 = call i8* @llvm.launder.invariant.group.p0i8(i8* %a)
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%a3 = call i8* @llvm.strip.invariant.group.p0i8(i8* %a2)
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ret i8* %a3
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}
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define i1 @simplifyForCompare(i8* %a) {
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; CHECK-LABEL: @simplifyForCompare(
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; CHECK-NEXT: [[TMP1:%.*]] = call i8* @llvm.strip.invariant.group.p0i8(i8* [[A:%.*]])
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; CHECK-NEXT: ret i1 true
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;
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%a2 = call i8* @llvm.launder.invariant.group.p0i8(i8* %a)
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%a3 = call i8* @llvm.strip.invariant.group.p0i8(i8* %a2)
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%b2 = call i8* @llvm.strip.invariant.group.p0i8(i8* %a)
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%c = icmp eq i8* %a3, %b2
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ret i1 %c
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}
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define i16* @skipWithDifferentTypes(i8* %a) {
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; CHECK-LABEL: @skipWithDifferentTypes(
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; CHECK-NEXT: [[TMP1:%.*]] = call i8* @llvm.strip.invariant.group.p0i8(i8* [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = bitcast i8* [[TMP1]] to i16*
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; CHECK-NEXT: ret i16* [[TMP2]]
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;
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%a2 = call i8* @llvm.launder.invariant.group.p0i8(i8* %a)
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%c1 = bitcast i8* %a2 to i16*
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%a3 = call i16* @llvm.strip.invariant.group.p0i16(i16* %c1)
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ret i16* %a3
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}
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define i16 addrspace(42)* @skipWithDifferentTypesAddrspace(i8 addrspace(42)* %a) {
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; CHECK-LABEL: @skipWithDifferentTypesAddrspace(
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; CHECK-NEXT: [[TMP1:%.*]] = call i8 addrspace(42)* @llvm.strip.invariant.group.p42i8(i8 addrspace(42)* [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = bitcast i8 addrspace(42)* [[TMP1]] to i16 addrspace(42)*
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; CHECK-NEXT: ret i16 addrspace(42)* [[TMP2]]
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;
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%a2 = call i8 addrspace(42)* @llvm.launder.invariant.group.p42i8(i8 addrspace(42)* %a)
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%c1 = bitcast i8 addrspace(42)* %a2 to i16 addrspace(42)*
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%a3 = call i16 addrspace(42)* @llvm.strip.invariant.group.p42i16(i16 addrspace(42)* %c1)
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ret i16 addrspace(42)* %a3
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}
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define i16 addrspace(42)* @skipWithDifferentTypesDifferentAddrspace(i8* %a) {
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; CHECK-LABEL: @skipWithDifferentTypesDifferentAddrspace(
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; CHECK-NEXT: [[TMP1:%.*]] = call i8* @llvm.strip.invariant.group.p0i8(i8* [[A:%.*]])
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; CHECK-NEXT: [[TMP2:%.*]] = bitcast i8* [[TMP1]] to i16*
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; CHECK-NEXT: [[TMP3:%.*]] = addrspacecast i16* [[TMP2]] to i16 addrspace(42)*
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; CHECK-NEXT: ret i16 addrspace(42)* [[TMP3]]
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;
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%cast = addrspacecast i8* %a to i8 addrspace(42)*
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%a2 = call i8 addrspace(42)* @llvm.launder.invariant.group.p42i8(i8 addrspace(42)* %cast)
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%c1 = bitcast i8 addrspace(42)* %a2 to i16 addrspace(42)*
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%a3 = call i16 addrspace(42)* @llvm.strip.invariant.group.p42i16(i16 addrspace(42)* %c1)
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ret i16 addrspace(42)* %a3
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}
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define i1 @icmp_null_launder(i8* %a) {
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; CHECK-LABEL: @icmp_null_launder(
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; CHECK-NEXT: [[R:%.*]] = icmp eq i8* [[A:%.*]], null
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; CHECK-NEXT: ret i1 [[R]]
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;
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%a2 = call i8* @llvm.launder.invariant.group.p0i8(i8* %a)
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%r = icmp eq i8* %a2, null
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ret i1 %r
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}
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define i1 @icmp_null_strip(i8* %a) {
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; CHECK-LABEL: @icmp_null_strip(
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; CHECK-NEXT: [[R:%.*]] = icmp eq i8* [[A:%.*]], null
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; CHECK-NEXT: ret i1 [[R]]
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;
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%a2 = call i8* @llvm.strip.invariant.group.p0i8(i8* %a)
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%r = icmp eq i8* %a2, null
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ret i1 %r
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}
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define i1 @icmp_null_launder_valid_null(i8* %a) #0 {
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; CHECK-LABEL: @icmp_null_launder_valid_null(
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; CHECK-NEXT: [[A2:%.*]] = call i8* @llvm.launder.invariant.group.p0i8(i8* [[A:%.*]])
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; CHECK-NEXT: [[R:%.*]] = icmp eq i8* [[A2]], null
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; CHECK-NEXT: ret i1 [[R]]
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;
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%a2 = call i8* @llvm.launder.invariant.group.p0i8(i8* %a)
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%r = icmp eq i8* %a2, null
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ret i1 %r
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}
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define i1 @icmp_null_strip_valid_null(i8* %a) #0 {
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; CHECK-LABEL: @icmp_null_strip_valid_null(
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; CHECK-NEXT: [[A2:%.*]] = call i8* @llvm.strip.invariant.group.p0i8(i8* [[A:%.*]])
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; CHECK-NEXT: [[R:%.*]] = icmp eq i8* [[A2]], null
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; CHECK-NEXT: ret i1 [[R]]
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;
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%a2 = call i8* @llvm.strip.invariant.group.p0i8(i8* %a)
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%r = icmp eq i8* %a2, null
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ret i1 %r
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}
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; Check that null always becomes the RHS
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define i1 @icmp_null_launder_lhs(i8* %a) {
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; CHECK-LABEL: @icmp_null_launder_lhs(
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; CHECK-NEXT: [[R:%.*]] = icmp eq i8* [[A:%.*]], null
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; CHECK-NEXT: ret i1 [[R]]
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;
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%a2 = call i8* @llvm.launder.invariant.group.p0i8(i8* %a)
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%r = icmp eq i8* null, %a2
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ret i1 %r
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}
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define i1 @icmp_null_launder_bitcasts(i32* %a) {
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; CHECK-LABEL: @icmp_null_launder_bitcasts(
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; CHECK-NEXT: [[R:%.*]] = icmp eq i32* [[A:%.*]], null
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; CHECK-NEXT: ret i1 [[R]]
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;
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%a2 = bitcast i32* %a to i8*
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%a3 = call i8* @llvm.launder.invariant.group.p0i8(i8* %a2)
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%a4 = bitcast i8* %a3 to i32*
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%r = icmp eq i32* %a4, null
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ret i1 %r
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}
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declare i8* @llvm.launder.invariant.group.p0i8(i8*)
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declare i8 addrspace(42)* @llvm.launder.invariant.group.p42i8(i8 addrspace(42)*)
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declare i8* @llvm.strip.invariant.group.p0i8(i8*)
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declare i8 addrspace(42)* @llvm.strip.invariant.group.p42i8(i8 addrspace(42)*)
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declare i16* @llvm.strip.invariant.group.p0i16(i16* %c1)
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declare i16 addrspace(42)* @llvm.strip.invariant.group.p42i16(i16 addrspace(42)* %c1)
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attributes #0 = { null_pointer_is_valid }
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