forked from OSchip/llvm-project
[NFC][InstCombine] Tests for bit test via highest sign-bit extract (w/ trunc) (PR43564)
https://rise4fun.com/Alive/x5IS llvm-svn: 373798
This commit is contained in:
Roman Lebedev
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6a954748c8
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3c56cc920f
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define i1 @highest_bit_test_via_lshr(i32 %data, i32 %nbits) {
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; CHECK-LABEL: @highest_bit_test_via_lshr(
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; CHECK-NEXT: [[ISNEG:%.*]] = icmp slt i32 [[DATA:%.*]], 0
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; CHECK-NEXT: ret i1 [[ISNEG]]
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;
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%num_low_bits_to_skip = sub i32 32, %nbits
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%high_bits_extracted = lshr i32 %data, %num_low_bits_to_skip
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%skip_all_bits_till_signbit = sub i32 %nbits, 1
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%signbit = lshr i32 %high_bits_extracted, %skip_all_bits_till_signbit
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%isneg = icmp ne i32 %signbit, 0
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ret i1 %isneg
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}
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define i1 @highest_bit_test_via_lshr_with_truncation(i64 %data, i32 %nbits) {
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; CHECK-LABEL: @highest_bit_test_via_lshr_with_truncation(
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; CHECK-NEXT: [[NUM_LOW_BITS_TO_SKIP:%.*]] = sub i32 64, [[NBITS:%.*]]
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; CHECK-NEXT: [[NUM_LOW_BITS_TO_SKIP_WIDE:%.*]] = zext i32 [[NUM_LOW_BITS_TO_SKIP]] to i64
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; CHECK-NEXT: [[HIGH_BITS_EXTRACTED:%.*]] = lshr i64 [[DATA:%.*]], [[NUM_LOW_BITS_TO_SKIP_WIDE]]
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; CHECK-NEXT: [[HIGH_BITS_EXTRACTED_NARROW:%.*]] = trunc i64 [[HIGH_BITS_EXTRACTED]] to i32
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; CHECK-NEXT: [[SKIP_ALL_BITS_TILL_SIGNBIT:%.*]] = add i32 [[NBITS]], -1
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; CHECK-NEXT: [[SIGNBIT:%.*]] = lshr i32 [[HIGH_BITS_EXTRACTED_NARROW]], [[SKIP_ALL_BITS_TILL_SIGNBIT]]
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; CHECK-NEXT: [[ISNEG:%.*]] = icmp ne i32 [[SIGNBIT]], 0
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; CHECK-NEXT: ret i1 [[ISNEG]]
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;
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%num_low_bits_to_skip = sub i32 64, %nbits
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%num_low_bits_to_skip_wide = zext i32 %num_low_bits_to_skip to i64
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%high_bits_extracted = lshr i64 %data, %num_low_bits_to_skip_wide
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%high_bits_extracted_narrow = trunc i64 %high_bits_extracted to i32
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%skip_all_bits_till_signbit = sub i32 %nbits, 1
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%signbit = lshr i32 %high_bits_extracted_narrow, %skip_all_bits_till_signbit
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%isneg = icmp ne i32 %signbit, 0
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ret i1 %isneg
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}
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define i1 @highest_bit_test_via_ashr(i32 %data, i32 %nbits) {
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; CHECK-LABEL: @highest_bit_test_via_ashr(
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; CHECK-NEXT: [[ISNEG:%.*]] = icmp slt i32 [[DATA:%.*]], 0
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; CHECK-NEXT: ret i1 [[ISNEG]]
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;
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%num_low_bits_to_skip = sub i32 32, %nbits
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%high_bits_extracted = ashr i32 %data, %num_low_bits_to_skip
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%skip_all_bits_till_signbit = sub i32 %nbits, 1
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%signbit = ashr i32 %high_bits_extracted, %skip_all_bits_till_signbit
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%isneg = icmp ne i32 %signbit, 0
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ret i1 %isneg
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}
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define i1 @highest_bit_test_via_ashr_with_truncation(i64 %data, i32 %nbits) {
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; CHECK-LABEL: @highest_bit_test_via_ashr_with_truncation(
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; CHECK-NEXT: [[NUM_LOW_BITS_TO_SKIP:%.*]] = sub i32 64, [[NBITS:%.*]]
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; CHECK-NEXT: [[NUM_LOW_BITS_TO_SKIP_WIDE:%.*]] = zext i32 [[NUM_LOW_BITS_TO_SKIP]] to i64
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; CHECK-NEXT: [[HIGH_BITS_EXTRACTED:%.*]] = ashr i64 [[DATA:%.*]], [[NUM_LOW_BITS_TO_SKIP_WIDE]]
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; CHECK-NEXT: [[HIGH_BITS_EXTRACTED_NARROW:%.*]] = trunc i64 [[HIGH_BITS_EXTRACTED]] to i32
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; CHECK-NEXT: [[SKIP_ALL_BITS_TILL_SIGNBIT:%.*]] = add i32 [[NBITS]], -1
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; CHECK-NEXT: [[SIGNBIT:%.*]] = ashr i32 [[HIGH_BITS_EXTRACTED_NARROW]], [[SKIP_ALL_BITS_TILL_SIGNBIT]]
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; CHECK-NEXT: [[ISNEG:%.*]] = icmp ne i32 [[SIGNBIT]], 0
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; CHECK-NEXT: ret i1 [[ISNEG]]
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;
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%num_low_bits_to_skip = sub i32 64, %nbits
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%num_low_bits_to_skip_wide = zext i32 %num_low_bits_to_skip to i64
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%high_bits_extracted = ashr i64 %data, %num_low_bits_to_skip_wide
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%high_bits_extracted_narrow = trunc i64 %high_bits_extracted to i32
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%skip_all_bits_till_signbit = sub i32 %nbits, 1
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%signbit = ashr i32 %high_bits_extracted_narrow, %skip_all_bits_till_signbit
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%isneg = icmp ne i32 %signbit, 0
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ret i1 %isneg
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}
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declare void @use32(i32)
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declare void @use64(i64)
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define i1 @unsigned_sign_bit_extract(i32 %x) {
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; CHECK-LABEL: @unsigned_sign_bit_extract(
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; CHECK-NEXT: [[ISNEG:%.*]] = icmp slt i32 [[X:%.*]], 0
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; CHECK-NEXT: ret i1 [[ISNEG]]
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;
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%signbit = lshr i32 %x, 31
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%isneg = icmp ne i32 %signbit, 0
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ret i1 %isneg
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}
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define i1 @unsigned_sign_bit_extract_extrause(i32 %x) {
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; CHECK-LABEL: @unsigned_sign_bit_extract_extrause(
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; CHECK-NEXT: [[SIGNBIT:%.*]] = lshr i32 [[X:%.*]], 31
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; CHECK-NEXT: call void @use32(i32 [[SIGNBIT]])
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; CHECK-NEXT: [[ISNEG:%.*]] = icmp ne i32 [[SIGNBIT]], 0
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; CHECK-NEXT: ret i1 [[ISNEG]]
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;
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%signbit = lshr i32 %x, 31
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call void @use32(i32 %signbit)
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%isneg = icmp ne i32 %signbit, 0
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ret i1 %isneg
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}
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define i1 @unsigned_sign_bit_extract_extrause__ispositive(i32 %x) {
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; CHECK-LABEL: @unsigned_sign_bit_extract_extrause__ispositive(
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; CHECK-NEXT: [[SIGNBIT:%.*]] = lshr i32 [[X:%.*]], 31
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; CHECK-NEXT: call void @use32(i32 [[SIGNBIT]])
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; CHECK-NEXT: [[ISNEG:%.*]] = icmp eq i32 [[SIGNBIT]], 0
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; CHECK-NEXT: ret i1 [[ISNEG]]
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;
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%signbit = lshr i32 %x, 31
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call void @use32(i32 %signbit)
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%isneg = icmp eq i32 %signbit, 0
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ret i1 %isneg
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}
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define i1 @signed_sign_bit_extract(i32 %x) {
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; CHECK-LABEL: @signed_sign_bit_extract(
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; CHECK-NEXT: [[ISNEG:%.*]] = icmp slt i32 [[X:%.*]], 0
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; CHECK-NEXT: ret i1 [[ISNEG]]
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;
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%signsmear = ashr i32 %x, 31
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%isneg = icmp ne i32 %signsmear, 0
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ret i1 %isneg
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}
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define i1 @signed_sign_bit_extract_extrause(i32 %x) {
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; CHECK-LABEL: @signed_sign_bit_extract_extrause(
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; CHECK-NEXT: [[SIGNSMEAR:%.*]] = ashr i32 [[X:%.*]], 31
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; CHECK-NEXT: call void @use32(i32 [[SIGNSMEAR]])
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; CHECK-NEXT: [[ISNEG:%.*]] = icmp ne i32 [[SIGNSMEAR]], 0
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; CHECK-NEXT: ret i1 [[ISNEG]]
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;
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%signsmear = ashr i32 %x, 31
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call void @use32(i32 %signsmear)
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%isneg = icmp ne i32 %signsmear, 0
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ret i1 %isneg
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}
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define i1 @unsigned_sign_bit_extract_with_trunc(i64 %x) {
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; CHECK-LABEL: @unsigned_sign_bit_extract_with_trunc(
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; CHECK-NEXT: [[ISNEG:%.*]] = icmp slt i64 [[X:%.*]], 0
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; CHECK-NEXT: ret i1 [[ISNEG]]
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;
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%signbit = lshr i64 %x, 63
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%signbit_narrow = trunc i64 %signbit to i32
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%isneg = icmp ne i32 %signbit_narrow, 0
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ret i1 %isneg
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}
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define i1 @unsigned_sign_bit_extract_with_trunc_extrause(i64 %x) {
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; CHECK-LABEL: @unsigned_sign_bit_extract_with_trunc_extrause(
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; CHECK-NEXT: [[SIGNBIT:%.*]] = lshr i64 [[X:%.*]], 63
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; CHECK-NEXT: call void @use64(i64 [[SIGNBIT]])
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; CHECK-NEXT: [[SIGNBIT_NARROW:%.*]] = trunc i64 [[SIGNBIT]] to i32
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; CHECK-NEXT: call void @use32(i32 [[SIGNBIT_NARROW]])
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; CHECK-NEXT: [[ISNEG:%.*]] = icmp ne i32 [[SIGNBIT_NARROW]], 0
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; CHECK-NEXT: ret i1 [[ISNEG]]
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;
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%signbit = lshr i64 %x, 63
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call void @use64(i64 %signbit)
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%signbit_narrow = trunc i64 %signbit to i32
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call void @use32(i32 %signbit_narrow)
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%isneg = icmp ne i32 %signbit_narrow, 0
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ret i1 %isneg
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}
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define i1 @signed_sign_bit_extract_trunc(i64 %x) {
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; CHECK-LABEL: @signed_sign_bit_extract_trunc(
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; CHECK-NEXT: [[SIGNSMEAR:%.*]] = ashr i64 [[X:%.*]], 63
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; CHECK-NEXT: [[SIGNSMEAR_NARROW:%.*]] = trunc i64 [[SIGNSMEAR]] to i32
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; CHECK-NEXT: [[ISNEG:%.*]] = icmp ne i32 [[SIGNSMEAR_NARROW]], 0
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; CHECK-NEXT: ret i1 [[ISNEG]]
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;
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%signsmear = ashr i64 %x, 63
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%signsmear_narrow = trunc i64 %signsmear to i32
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%isneg = icmp ne i32 %signsmear_narrow, 0
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ret i1 %isneg
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}
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define i1 @signed_sign_bit_extract_trunc_extrause(i64 %x) {
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; CHECK-LABEL: @signed_sign_bit_extract_trunc_extrause(
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; CHECK-NEXT: [[SIGNSMEAR:%.*]] = ashr i64 [[X:%.*]], 63
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; CHECK-NEXT: call void @use64(i64 [[SIGNSMEAR]])
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; CHECK-NEXT: [[SIGNSMEAR_NARROW:%.*]] = trunc i64 [[SIGNSMEAR]] to i32
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; CHECK-NEXT: call void @use32(i32 [[SIGNSMEAR_NARROW]])
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; CHECK-NEXT: [[ISNEG:%.*]] = icmp ne i32 [[SIGNSMEAR_NARROW]], 0
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; CHECK-NEXT: ret i1 [[ISNEG]]
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;
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%signsmear = ashr i64 %x, 63
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call void @use64(i64 %signsmear)
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%signsmear_narrow = trunc i64 %signsmear to i32
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call void @use32(i32 %signsmear_narrow)
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%isneg = icmp ne i32 %signsmear_narrow, 0
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ret i1 %isneg
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}
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