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https://github.com/RPCS3/llvm-mirror.git
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89c1a36077
There are several potential srem-by-2 folds
because the result is known {-1,0,1}.
https://alive2.llvm.org/ce/z/LuVyeK
391 lines
11 KiB
LLVM
391 lines
11 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -instcombine -S < %s | FileCheck %s
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target datalayout = "e-m:e-i64:64-n8:16:32:64"
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declare i32 @llvm.cttz.i32(i32, i1) nounwind readnone
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declare i32 @llvm.ctlz.i32(i32, i1) nounwind readnone
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declare i32 @llvm.ctpop.i32(i32) nounwind readnone
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declare <2 x i8> @llvm.cttz.v2i8(<2 x i8>, i1) nounwind readnone
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declare <2 x i8> @llvm.ctlz.v2i8(<2 x i8>, i1) nounwind readnone
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declare <2 x i8> @llvm.ctpop.v2i8(<2 x i8>) nounwind readnone
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define i32 @lshr_ctlz_zero_is_not_undef(i32 %x) {
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; CHECK-LABEL: @lshr_ctlz_zero_is_not_undef(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[X:%.*]], 0
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; CHECK-NEXT: [[SH:%.*]] = zext i1 [[TMP1]] to i32
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; CHECK-NEXT: ret i32 [[SH]]
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;
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%ct = call i32 @llvm.ctlz.i32(i32 %x, i1 false)
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%sh = lshr i32 %ct, 5
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ret i32 %sh
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}
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define i32 @lshr_cttz_zero_is_not_undef(i32 %x) {
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; CHECK-LABEL: @lshr_cttz_zero_is_not_undef(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[X:%.*]], 0
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; CHECK-NEXT: [[SH:%.*]] = zext i1 [[TMP1]] to i32
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; CHECK-NEXT: ret i32 [[SH]]
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;
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%ct = call i32 @llvm.cttz.i32(i32 %x, i1 false)
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%sh = lshr i32 %ct, 5
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ret i32 %sh
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}
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define i32 @lshr_ctpop(i32 %x) {
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; CHECK-LABEL: @lshr_ctpop(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq i32 [[X:%.*]], -1
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; CHECK-NEXT: [[SH:%.*]] = zext i1 [[TMP1]] to i32
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; CHECK-NEXT: ret i32 [[SH]]
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;
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%ct = call i32 @llvm.ctpop.i32(i32 %x)
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%sh = lshr i32 %ct, 5
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ret i32 %sh
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}
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define <2 x i8> @lshr_ctlz_zero_is_not_undef_splat_vec(<2 x i8> %x) {
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; CHECK-LABEL: @lshr_ctlz_zero_is_not_undef_splat_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <2 x i8> [[X:%.*]], zeroinitializer
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; CHECK-NEXT: [[SH:%.*]] = zext <2 x i1> [[TMP1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[SH]]
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;
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%ct = call <2 x i8> @llvm.ctlz.v2i8(<2 x i8> %x, i1 false)
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%sh = lshr <2 x i8> %ct, <i8 3, i8 3>
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ret <2 x i8> %sh
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}
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define <2 x i8> @lshr_cttz_zero_is_not_undef_splat_vec(<2 x i8> %x) {
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; CHECK-LABEL: @lshr_cttz_zero_is_not_undef_splat_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <2 x i8> [[X:%.*]], zeroinitializer
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; CHECK-NEXT: [[SH:%.*]] = zext <2 x i1> [[TMP1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[SH]]
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;
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%ct = call <2 x i8> @llvm.cttz.v2i8(<2 x i8> %x, i1 false)
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%sh = lshr <2 x i8> %ct, <i8 3, i8 3>
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ret <2 x i8> %sh
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}
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define <2 x i8> @lshr_ctpop_splat_vec(<2 x i8> %x) {
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; CHECK-LABEL: @lshr_ctpop_splat_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = icmp eq <2 x i8> [[X:%.*]], <i8 -1, i8 -1>
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; CHECK-NEXT: [[SH:%.*]] = zext <2 x i1> [[TMP1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[SH]]
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;
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%ct = call <2 x i8> @llvm.ctpop.v2i8(<2 x i8> %x)
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%sh = lshr <2 x i8> %ct, <i8 3, i8 3>
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ret <2 x i8> %sh
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}
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define i32 @lshr_ctlz_zero_is_undef(i32 %x) {
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; CHECK-LABEL: @lshr_ctlz_zero_is_undef(
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; CHECK-NEXT: ret i32 0
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;
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%ct = call i32 @llvm.ctlz.i32(i32 %x, i1 true)
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%sh = lshr i32 %ct, 5
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ret i32 %sh
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}
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define i32 @lshr_cttz_zero_is_undef(i32 %x) {
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; CHECK-LABEL: @lshr_cttz_zero_is_undef(
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; CHECK-NEXT: ret i32 0
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;
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%ct = call i32 @llvm.cttz.i32(i32 %x, i1 true)
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%sh = lshr i32 %ct, 5
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ret i32 %sh
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}
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define <2 x i8> @lshr_ctlz_zero_is_undef_splat_vec(<2 x i8> %x) {
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; CHECK-LABEL: @lshr_ctlz_zero_is_undef_splat_vec(
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; CHECK-NEXT: ret <2 x i8> zeroinitializer
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;
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%ct = call <2 x i8> @llvm.ctlz.v2i8(<2 x i8> %x, i1 true)
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%sh = lshr <2 x i8> %ct, <i8 3, i8 3>
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ret <2 x i8> %sh
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}
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define i8 @lshr_ctlz_zero_is_undef_vec(<2 x i8> %x) {
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; CHECK-LABEL: @lshr_ctlz_zero_is_undef_vec(
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; CHECK-NEXT: ret i8 0
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;
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%ct = call <2 x i8> @llvm.ctlz.v2i8(<2 x i8> %x, i1 true)
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%sh = lshr <2 x i8> %ct, <i8 3, i8 0>
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%ex = extractelement <2 x i8> %sh, i32 0
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ret i8 %ex
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}
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define <2 x i8> @lshr_cttz_zero_is_undef_splat_vec(<2 x i8> %x) {
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; CHECK-LABEL: @lshr_cttz_zero_is_undef_splat_vec(
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; CHECK-NEXT: ret <2 x i8> zeroinitializer
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;
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%ct = call <2 x i8> @llvm.cttz.v2i8(<2 x i8> %x, i1 true)
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%sh = lshr <2 x i8> %ct, <i8 3, i8 3>
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ret <2 x i8> %sh
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}
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define i8 @lshr_cttz_zero_is_undef_vec(<2 x i8> %x) {
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; CHECK-LABEL: @lshr_cttz_zero_is_undef_vec(
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; CHECK-NEXT: ret i8 0
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;
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%ct = call <2 x i8> @llvm.cttz.v2i8(<2 x i8> %x, i1 true)
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%sh = lshr <2 x i8> %ct, <i8 3, i8 0>
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%ex = extractelement <2 x i8> %sh, i32 0
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ret i8 %ex
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}
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define i8 @lshr_exact(i8 %x) {
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; CHECK-LABEL: @lshr_exact(
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; CHECK-NEXT: [[SHL:%.*]] = shl i8 [[X:%.*]], 2
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; CHECK-NEXT: [[ADD:%.*]] = add i8 [[SHL]], 4
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; CHECK-NEXT: [[LSHR:%.*]] = lshr exact i8 [[ADD]], 2
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; CHECK-NEXT: ret i8 [[LSHR]]
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;
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%shl = shl i8 %x, 2
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%add = add i8 %shl, 4
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%lshr = lshr i8 %add, 2
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ret i8 %lshr
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}
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define <2 x i8> @lshr_exact_splat_vec(<2 x i8> %x) {
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; CHECK-LABEL: @lshr_exact_splat_vec(
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; CHECK-NEXT: [[SHL:%.*]] = shl <2 x i8> [[X:%.*]], <i8 2, i8 2>
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; CHECK-NEXT: [[ADD:%.*]] = add <2 x i8> [[SHL]], <i8 4, i8 4>
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; CHECK-NEXT: [[LSHR:%.*]] = lshr exact <2 x i8> [[ADD]], <i8 2, i8 2>
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; CHECK-NEXT: ret <2 x i8> [[LSHR]]
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;
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%shl = shl <2 x i8> %x, <i8 2, i8 2>
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%add = add <2 x i8> %shl, <i8 4, i8 4>
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%lshr = lshr <2 x i8> %add, <i8 2, i8 2>
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ret <2 x i8> %lshr
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}
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define i16 @bool_zext(i1 %x) {
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; CHECK-LABEL: @bool_zext(
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; CHECK-NEXT: [[HIBIT:%.*]] = zext i1 [[X:%.*]] to i16
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; CHECK-NEXT: ret i16 [[HIBIT]]
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;
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%sext = sext i1 %x to i16
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%hibit = lshr i16 %sext, 15
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ret i16 %hibit
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}
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define <2 x i8> @bool_zext_splat(<2 x i1> %x) {
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; CHECK-LABEL: @bool_zext_splat(
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; CHECK-NEXT: [[HIBIT:%.*]] = zext <2 x i1> [[X:%.*]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[HIBIT]]
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;
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%sext = sext <2 x i1> %x to <2 x i8>
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%hibit = lshr <2 x i8> %sext, <i8 7, i8 7>
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ret <2 x i8> %hibit
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}
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define i32 @smear_sign_and_widen(i8 %x) {
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; CHECK-LABEL: @smear_sign_and_widen(
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; CHECK-NEXT: [[TMP1:%.*]] = ashr i8 [[X:%.*]], 7
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; CHECK-NEXT: [[HIBIT:%.*]] = zext i8 [[TMP1]] to i32
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; CHECK-NEXT: ret i32 [[HIBIT]]
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;
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%sext = sext i8 %x to i32
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%hibit = lshr i32 %sext, 24
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ret i32 %hibit
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}
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define i16 @smear_sign_and_widen_should_not_change_type(i4 %x) {
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; CHECK-LABEL: @smear_sign_and_widen_should_not_change_type(
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; CHECK-NEXT: [[SEXT:%.*]] = sext i4 [[X:%.*]] to i16
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; CHECK-NEXT: [[HIBIT:%.*]] = lshr i16 [[SEXT]], 12
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; CHECK-NEXT: ret i16 [[HIBIT]]
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;
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%sext = sext i4 %x to i16
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%hibit = lshr i16 %sext, 12
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ret i16 %hibit
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}
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define <2 x i8> @smear_sign_and_widen_splat(<2 x i6> %x) {
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; CHECK-LABEL: @smear_sign_and_widen_splat(
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; CHECK-NEXT: [[TMP1:%.*]] = ashr <2 x i6> [[X:%.*]], <i6 2, i6 2>
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; CHECK-NEXT: [[HIBIT:%.*]] = zext <2 x i6> [[TMP1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[HIBIT]]
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;
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%sext = sext <2 x i6> %x to <2 x i8>
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%hibit = lshr <2 x i8> %sext, <i8 2, i8 2>
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ret <2 x i8> %hibit
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}
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define i18 @fake_sext(i3 %x) {
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; CHECK-LABEL: @fake_sext(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr i3 [[X:%.*]], 2
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; CHECK-NEXT: [[SH:%.*]] = zext i3 [[TMP1]] to i18
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; CHECK-NEXT: ret i18 [[SH]]
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;
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%sext = sext i3 %x to i18
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%sh = lshr i18 %sext, 17
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ret i18 %sh
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}
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; Avoid the transform if it would change the shift from a legal to illegal type.
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define i32 @fake_sext_but_should_not_change_type(i3 %x) {
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; CHECK-LABEL: @fake_sext_but_should_not_change_type(
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; CHECK-NEXT: [[SEXT:%.*]] = sext i3 [[X:%.*]] to i32
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; CHECK-NEXT: [[SH:%.*]] = lshr i32 [[SEXT]], 31
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; CHECK-NEXT: ret i32 [[SH]]
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;
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%sext = sext i3 %x to i32
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%sh = lshr i32 %sext, 31
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ret i32 %sh
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}
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define <2 x i8> @fake_sext_splat(<2 x i3> %x) {
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; CHECK-LABEL: @fake_sext_splat(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr <2 x i3> [[X:%.*]], <i3 2, i3 2>
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; CHECK-NEXT: [[SH:%.*]] = zext <2 x i3> [[TMP1]] to <2 x i8>
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; CHECK-NEXT: ret <2 x i8> [[SH]]
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;
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%sext = sext <2 x i3> %x to <2 x i8>
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%sh = lshr <2 x i8> %sext, <i8 7, i8 7>
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ret <2 x i8> %sh
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}
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; Use a narrow shift: lshr (zext iM X to iN), C --> zext (lshr X, C) to iN
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define <2 x i32> @narrow_lshr_constant(<2 x i8> %x, <2 x i8> %y) {
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; CHECK-LABEL: @narrow_lshr_constant(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr <2 x i8> [[X:%.*]], <i8 3, i8 3>
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; CHECK-NEXT: [[SH:%.*]] = zext <2 x i8> [[TMP1]] to <2 x i32>
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; CHECK-NEXT: ret <2 x i32> [[SH]]
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;
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%zx = zext <2 x i8> %x to <2 x i32>
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%sh = lshr <2 x i32> %zx, <i32 3, i32 3>
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ret <2 x i32> %sh
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}
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define i32 @mul_splat_fold(i32 %x) {
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; CHECK-LABEL: @mul_splat_fold(
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; CHECK-NEXT: [[T:%.*]] = and i32 [[X:%.*]], 65535
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; CHECK-NEXT: ret i32 [[T]]
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;
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%m = mul nuw i32 %x, 65537
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%t = lshr i32 %m, 16
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ret i32 %t
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}
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; Vector type, extra use, weird types are all ok.
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declare void @usevec(<3 x i14>)
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define <3 x i14> @mul_splat_fold_vec(<3 x i14> %x) {
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; CHECK-LABEL: @mul_splat_fold_vec(
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; CHECK-NEXT: [[M:%.*]] = mul nuw <3 x i14> [[X:%.*]], <i14 129, i14 129, i14 129>
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; CHECK-NEXT: call void @usevec(<3 x i14> [[M]])
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; CHECK-NEXT: [[T:%.*]] = and <3 x i14> [[X]], <i14 127, i14 127, i14 127>
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; CHECK-NEXT: ret <3 x i14> [[T]]
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;
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%m = mul nuw <3 x i14> %x, <i14 129, i14 129, i14 129>
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call void @usevec(<3 x i14> %m)
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%t = lshr <3 x i14> %m, <i14 7, i14 7, i14 7>
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ret <3 x i14> %t
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}
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; Negative test
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define i32 @mul_splat_fold_wrong_mul_const(i32 %x) {
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; CHECK-LABEL: @mul_splat_fold_wrong_mul_const(
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; CHECK-NEXT: [[M:%.*]] = mul nuw i32 [[X:%.*]], 65538
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; CHECK-NEXT: [[T:%.*]] = lshr i32 [[M]], 16
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; CHECK-NEXT: ret i32 [[T]]
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;
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%m = mul nuw i32 %x, 65538
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%t = lshr i32 %m, 16
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ret i32 %t
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}
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; Negative test
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define i32 @mul_splat_fold_wrong_lshr_const(i32 %x) {
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; CHECK-LABEL: @mul_splat_fold_wrong_lshr_const(
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; CHECK-NEXT: [[M:%.*]] = mul nuw i32 [[X:%.*]], 65537
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; CHECK-NEXT: [[T:%.*]] = lshr i32 [[M]], 15
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; CHECK-NEXT: ret i32 [[T]]
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;
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%m = mul nuw i32 %x, 65537
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%t = lshr i32 %m, 15
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ret i32 %t
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}
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; Negative test
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define i32 @mul_splat_fold_no_nuw(i32 %x) {
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; CHECK-LABEL: @mul_splat_fold_no_nuw(
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; CHECK-NEXT: [[M:%.*]] = mul nsw i32 [[X:%.*]], 65537
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; CHECK-NEXT: [[T:%.*]] = lshr i32 [[M]], 16
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; CHECK-NEXT: ret i32 [[T]]
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;
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%m = mul nsw i32 %x, 65537
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%t = lshr i32 %m, 16
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ret i32 %t
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}
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define i32 @negative_and_odd(i32 %x) {
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; CHECK-LABEL: @negative_and_odd(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr i32 [[X:%.*]], 31
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; CHECK-NEXT: [[R:%.*]] = and i32 [[TMP1]], [[X]]
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; CHECK-NEXT: ret i32 [[R]]
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;
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%s = srem i32 %x, 2
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%r = lshr i32 %s, 31
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ret i32 %r
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}
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define <2 x i7> @negative_and_odd_vec(<2 x i7> %x) {
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; CHECK-LABEL: @negative_and_odd_vec(
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; CHECK-NEXT: [[TMP1:%.*]] = lshr <2 x i7> [[X:%.*]], <i7 6, i7 6>
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; CHECK-NEXT: [[R:%.*]] = and <2 x i7> [[TMP1]], [[X]]
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; CHECK-NEXT: ret <2 x i7> [[R]]
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;
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%s = srem <2 x i7> %x, <i7 2, i7 2>
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%r = lshr <2 x i7> %s, <i7 6, i7 6>
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ret <2 x i7> %r
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}
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; Negative test - this is still worth trying to avoid srem?
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define i32 @negative_and_odd_uses(i32 %x, i32* %p) {
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; CHECK-LABEL: @negative_and_odd_uses(
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; CHECK-NEXT: [[S:%.*]] = srem i32 [[X:%.*]], 2
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; CHECK-NEXT: store i32 [[S]], i32* [[P:%.*]], align 4
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; CHECK-NEXT: [[R:%.*]] = lshr i32 [[S]], 31
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; CHECK-NEXT: ret i32 [[R]]
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;
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%s = srem i32 %x, 2
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store i32 %s, i32* %p
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%r = lshr i32 %s, 31
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ret i32 %r
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}
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; Negative test - wrong divisor
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define i32 @srem3(i32 %x) {
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; CHECK-LABEL: @srem3(
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; CHECK-NEXT: [[S:%.*]] = srem i32 [[X:%.*]], 3
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; CHECK-NEXT: [[R:%.*]] = lshr i32 [[S]], 31
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; CHECK-NEXT: ret i32 [[R]]
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;
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%s = srem i32 %x, 3
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%r = lshr i32 %s, 31
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ret i32 %r
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}
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; Negative test - wrong shift amount
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define i32 @srem2_lshr30(i32 %x) {
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; CHECK-LABEL: @srem2_lshr30(
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; CHECK-NEXT: [[S:%.*]] = srem i32 [[X:%.*]], 2
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; CHECK-NEXT: [[R:%.*]] = lshr i32 [[S]], 30
|
|
; CHECK-NEXT: ret i32 [[R]]
|
|
;
|
|
%s = srem i32 %x, 2
|
|
%r = lshr i32 %s, 30
|
|
ret i32 %r
|
|
}
|