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6501fb731e
Summary: When not useful bits, BitWidth becomes 0 and APInt will not be happy. See https://llvm.org/bugs/show_bug.cgi?id=25571 We can just mark the operand as IMPLICIT_DEF is none bits of it is used. Reviewers: t.p.northover, jmolloy Subscribers: gberry, jmolloy, mgrang, aemerson, llvm-commits, rengolin Differential Revision: http://reviews.llvm.org/D14803 llvm-svn: 254440
240 lines
7.1 KiB
LLVM
240 lines
7.1 KiB
LLVM
; RUN: llc -mtriple=aarch64-none-linux-gnu < %s | FileCheck %s --check-prefix=CHECK
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; First, a simple example from Clang. The registers could plausibly be
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; different, but probably won't be.
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%struct.foo = type { i8, [2 x i8], i8 }
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define [1 x i64] @from_clang([1 x i64] %f.coerce, i32 %n) nounwind readnone {
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; CHECK-LABEL: from_clang:
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; CHECK: bfi {{w[0-9]+}}, {{w[0-9]+}}, #3, #4
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entry:
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%f.coerce.fca.0.extract = extractvalue [1 x i64] %f.coerce, 0
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%tmp.sroa.0.0.extract.trunc = trunc i64 %f.coerce.fca.0.extract to i32
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%bf.value = shl i32 %n, 3
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%0 = and i32 %bf.value, 120
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%f.sroa.0.0.insert.ext.masked = and i32 %tmp.sroa.0.0.extract.trunc, 135
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%1 = or i32 %f.sroa.0.0.insert.ext.masked, %0
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%f.sroa.0.0.extract.trunc = zext i32 %1 to i64
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%tmp1.sroa.1.1.insert.insert = and i64 %f.coerce.fca.0.extract, 4294967040
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%tmp1.sroa.0.0.insert.insert = or i64 %f.sroa.0.0.extract.trunc, %tmp1.sroa.1.1.insert.insert
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%.fca.0.insert = insertvalue [1 x i64] undef, i64 %tmp1.sroa.0.0.insert.insert, 0
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ret [1 x i64] %.fca.0.insert
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}
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define void @test_whole32(i32* %existing, i32* %new) {
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; CHECK-LABEL: test_whole32:
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; CHECK: bfi {{w[0-9]+}}, {{w[0-9]+}}, #26, #5
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%oldval = load volatile i32, i32* %existing
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%oldval_keep = and i32 %oldval, 2214592511 ; =0x83ffffff
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%newval = load volatile i32, i32* %new
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%newval_shifted = shl i32 %newval, 26
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%newval_masked = and i32 %newval_shifted, 2080374784 ; = 0x7c000000
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%combined = or i32 %oldval_keep, %newval_masked
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store volatile i32 %combined, i32* %existing
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ret void
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}
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define void @test_whole64(i64* %existing, i64* %new) {
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; CHECK-LABEL: test_whole64:
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; CHECK: bfi {{x[0-9]+}}, {{x[0-9]+}}, #26, #14
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; CHECK-NOT: and
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; CHECK: ret
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%oldval = load volatile i64, i64* %existing
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%oldval_keep = and i64 %oldval, 18446742974265032703 ; = 0xffffff0003ffffffL
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%newval = load volatile i64, i64* %new
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%newval_shifted = shl i64 %newval, 26
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%newval_masked = and i64 %newval_shifted, 1099444518912 ; = 0xfffc000000
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%combined = or i64 %oldval_keep, %newval_masked
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store volatile i64 %combined, i64* %existing
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ret void
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}
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define void @test_whole32_from64(i64* %existing, i64* %new) {
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; CHECK-LABEL: test_whole32_from64:
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; CHECK: bfxil {{x[0-9]+}}, {{x[0-9]+}}, #0, #16
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; CHECK: ret
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%oldval = load volatile i64, i64* %existing
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%oldval_keep = and i64 %oldval, 4294901760 ; = 0xffff0000
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%newval = load volatile i64, i64* %new
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%newval_masked = and i64 %newval, 65535 ; = 0xffff
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%combined = or i64 %oldval_keep, %newval_masked
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store volatile i64 %combined, i64* %existing
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ret void
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}
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define void @test_32bit_masked(i32 *%existing, i32 *%new) {
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; CHECK-LABEL: test_32bit_masked:
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; CHECK: and
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; CHECK: bfi [[INSERT:w[0-9]+]], {{w[0-9]+}}, #3, #4
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%oldval = load volatile i32, i32* %existing
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%oldval_keep = and i32 %oldval, 135 ; = 0x87
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%newval = load volatile i32, i32* %new
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%newval_shifted = shl i32 %newval, 3
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%newval_masked = and i32 %newval_shifted, 120 ; = 0x78
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%combined = or i32 %oldval_keep, %newval_masked
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store volatile i32 %combined, i32* %existing
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ret void
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}
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define void @test_64bit_masked(i64 *%existing, i64 *%new) {
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; CHECK-LABEL: test_64bit_masked:
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; CHECK: and
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; CHECK: bfi [[INSERT:x[0-9]+]], {{x[0-9]+}}, #40, #8
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%oldval = load volatile i64, i64* %existing
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%oldval_keep = and i64 %oldval, 1095216660480 ; = 0xff_0000_0000
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%newval = load volatile i64, i64* %new
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%newval_shifted = shl i64 %newval, 40
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%newval_masked = and i64 %newval_shifted, 280375465082880 ; = 0xff00_0000_0000
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%combined = or i64 %newval_masked, %oldval_keep
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store volatile i64 %combined, i64* %existing
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ret void
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}
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; Mask is too complicated for literal ANDwwi, make sure other avenues are tried.
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define void @test_32bit_complexmask(i32 *%existing, i32 *%new) {
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; CHECK-LABEL: test_32bit_complexmask:
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; CHECK: and
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; CHECK: bfi {{w[0-9]+}}, {{w[0-9]+}}, #3, #4
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%oldval = load volatile i32, i32* %existing
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%oldval_keep = and i32 %oldval, 647 ; = 0x287
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%newval = load volatile i32, i32* %new
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%newval_shifted = shl i32 %newval, 3
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%newval_masked = and i32 %newval_shifted, 120 ; = 0x278
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%combined = or i32 %oldval_keep, %newval_masked
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store volatile i32 %combined, i32* %existing
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ret void
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}
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; Neither mask is is a contiguous set of 1s. BFI can't be used
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define void @test_32bit_badmask(i32 *%existing, i32 *%new) {
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; CHECK-LABEL: test_32bit_badmask:
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; CHECK-NOT: bfi
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; CHECK-NOT: bfm
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; CHECK: ret
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%oldval = load volatile i32, i32* %existing
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%oldval_keep = and i32 %oldval, 135 ; = 0x87
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%newval = load volatile i32, i32* %new
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%newval_shifted = shl i32 %newval, 3
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%newval_masked = and i32 %newval_shifted, 632 ; = 0x278
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%combined = or i32 %oldval_keep, %newval_masked
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store volatile i32 %combined, i32* %existing
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ret void
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}
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; Ditto
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define void @test_64bit_badmask(i64 *%existing, i64 *%new) {
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; CHECK-LABEL: test_64bit_badmask:
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; CHECK-NOT: bfi
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; CHECK-NOT: bfm
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; CHECK: ret
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%oldval = load volatile i64, i64* %existing
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%oldval_keep = and i64 %oldval, 135 ; = 0x87
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%newval = load volatile i64, i64* %new
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%newval_shifted = shl i64 %newval, 3
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%newval_masked = and i64 %newval_shifted, 664 ; = 0x278
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%combined = or i64 %oldval_keep, %newval_masked
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store volatile i64 %combined, i64* %existing
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ret void
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}
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; Bitfield insert where there's a left-over shr needed at the beginning
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; (e.g. result of str.bf1 = str.bf2)
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define void @test_32bit_with_shr(i32* %existing, i32* %new) {
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; CHECK-LABEL: test_32bit_with_shr:
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%oldval = load volatile i32, i32* %existing
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%oldval_keep = and i32 %oldval, 2214592511 ; =0x83ffffff
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%newval = load i32, i32* %new
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%newval_shifted = shl i32 %newval, 12
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%newval_masked = and i32 %newval_shifted, 2080374784 ; = 0x7c000000
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%combined = or i32 %oldval_keep, %newval_masked
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store volatile i32 %combined, i32* %existing
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; CHECK: lsr [[BIT:w[0-9]+]], {{w[0-9]+}}, #14
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; CHECK: bfi {{w[0-9]+}}, [[BIT]], #26, #5
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ret void
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}
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; Bitfield insert where the second or operand is a better match to be folded into the BFM
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define void @test_32bit_opnd1_better(i32* %existing, i32* %new) {
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; CHECK-LABEL: test_32bit_opnd1_better:
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%oldval = load volatile i32, i32* %existing
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%oldval_keep = and i32 %oldval, 65535 ; 0x0000ffff
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%newval = load i32, i32* %new
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%newval_shifted = shl i32 %newval, 16
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%newval_masked = and i32 %newval_shifted, 16711680 ; 0x00ff0000
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%combined = or i32 %oldval_keep, %newval_masked
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store volatile i32 %combined, i32* %existing
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; CHECK: and [[BIT:w[0-9]+]], {{w[0-9]+}}, #0xffff
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; CHECK: bfi [[BIT]], {{w[0-9]+}}, #16, #8
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ret void
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}
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; Tests when all the bits from one operand are not useful
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define i32 @test_nouseful_bits(i8 %a, i32 %b) {
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; CHECK-LABEL: test_nouseful_bits:
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; CHECK: bfi
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; CHECK: bfi
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; CHECK: bfi
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; CHECK-NOT: bfi
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; CHECK-NOT: or
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; CHECK: lsl
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%conv = zext i8 %a to i32 ; 0 0 0 A
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%shl = shl i32 %b, 8 ; B2 B1 B0 0
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%or = or i32 %conv, %shl ; B2 B1 B0 A
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%shl.1 = shl i32 %or, 8 ; B1 B0 A 0
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%or.1 = or i32 %conv, %shl.1 ; B1 B0 A A
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%shl.2 = shl i32 %or.1, 8 ; B0 A A 0
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%or.2 = or i32 %conv, %shl.2 ; B0 A A A
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%shl.3 = shl i32 %or.2, 8 ; A A A 0
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%or.3 = or i32 %conv, %shl.3 ; A A A A
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%shl.4 = shl i32 %or.3, 8 ; A A A 0
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ret i32 %shl.4
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}
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