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llvm-mirror/test/CodeGen/WebAssembly/umulo-128-legalisation-lowering.ll

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[WebAssembly] Added default stack-only instruction mode for MC. Summary: Made it convert from register to stack based instructions, and removed the registers. Fixes to related code that was expecting register based instructions. Added the correct testing flag to all tests, depending on what the format they were expecting so far. Translated one test to stack format as example: reg-stackify-stack.ll tested: llvm-lit -v `find test -name WebAssembly` unittests/MC/* Reviewers: dschuff, sunfish Subscribers: sbc100, jgravelle-google, eraman, aheejin, llvm-commits, jfb Differential Revision: https://reviews.llvm.org/D51241 llvm-svn: 340750
2018-08-27 17:45:51 +02:00
; RUN: llc < %s -mtriple=wasm32 -wasm-keep-registers | FileCheck %s --check-prefixes=WASM32
[SelectionDAG] Improve the legalisation lowering of UMULO. There is no way in the universe, that doing a full-width division in software will be faster than doing overflowing multiplication in software in the first place, especially given that this same full-width multiplication needs to be done anyway. This patch replaces the previous implementation with a direct lowering into an overflowing multiplication algorithm based on half-width operations. Correctness of the algorithm was verified by exhaustively checking the output of this algorithm for overflowing multiplication of 16 bit integers against an obviously correct widening multiplication. Baring any oversights introduced by porting the algorithm to DAG, confidence in correctness of this algorithm is extremely high. Following table shows the change in both t = runtime and s = space. The change is expressed as a multiplier of original, so anything under 1 is “better” and anything above 1 is worse. +-------+-----------+-----------+-------------+-------------+ | Arch | u64*u64 t | u64*u64 s | u128*u128 t | u128*u128 s | +-------+-----------+-----------+-------------+-------------+ | X64 | - | - | ~0.5 | ~0.64 | | i686 | ~0.5 | ~0.6666 | ~0.05 | ~0.9 | | armv7 | - | ~0.75 | - | ~1.4 | +-------+-----------+-----------+-------------+-------------+ Performance numbers have been collected by running overflowing multiplication in a loop under `perf` on two x86_64 (one Intel Haswell, other AMD Ryzen) based machines. Size numbers have been collected by looking at the size of function containing an overflowing multiply in a loop. All in all, it can be seen that both performance and size has improved except in the case of armv7 where code size has regressed for 128-bit multiply. u128*u128 overflowing multiply on 32-bit platforms seem to benefit from this change a lot, taking only 5% of the time compared to original algorithm to calculate the same thing. The final benefit of this change is that LLVM is now capable of lowering the overflowing unsigned multiply for integers of any bit-width as long as the target is capable of lowering regular multiplication for the same bit-width. Previously, 128-bit overflowing multiply was the widest possible. Patch by Simonas Kazlauskas! Differential Revision: https://reviews.llvm.org/D50310 llvm-svn: 339922
2018-08-16 20:39:39 +02:00
; NOTE: did not compile on wasm64 at the time the test was created!
define { i128, i8 } @muloti_test(i128 %l, i128 %r) unnamed_addr #0 {
; WASM32-LABEL: muloti_test
; WASM32: get_global $push18=, __stack_pointer@GLOBAL
; WASM32: i32.const $push19=, 48
; WASM32: i32.sub $push40=, $pop18, $pop19
; WASM32: tee_local $push39=, 5, $pop40
; WASM32: set_global __stack_pointer@GLOBAL, $pop39
; WASM32: get_local $push41=, 5
; WASM32: i32.const $push22=, 32
; WASM32: i32.add $push23=, $pop41, $pop22
; WASM32: get_local $push43=, 1
; WASM32: i64.const $push0=, 0
; WASM32: get_local $push42=, 3
; WASM32: i64.const $push38=, 0
; WASM32: call __multi3@FUNCTION, $pop23, $pop43, $pop0, $pop42, $pop38
; WASM32: get_local $push44=, 5
; WASM32: i32.const $push24=, 16
; WASM32: i32.add $push25=, $pop44, $pop24
; WASM32: get_local $push46=, 4
; WASM32: i64.const $push37=, 0
; WASM32: get_local $push45=, 1
; WASM32: i64.const $push36=, 0
; WASM32: call __multi3@FUNCTION, $pop25, $pop46, $pop37, $pop45, $pop36
; WASM32: get_local $push49=, 5
; WASM32: get_local $push48=, 2
; WASM32: i64.const $push35=, 0
; WASM32: get_local $push47=, 3
; WASM32: i64.const $push34=, 0
; WASM32: call __multi3@FUNCTION, $pop49, $pop48, $pop35, $pop47, $pop34
; WASM32: get_local $push51=, 0
; WASM32: get_local $push50=, 5
; WASM32: i64.load $push1=, 32($pop50)
; WASM32: i64.store 0($pop51), $pop1
; WASM32: get_local $push55=, 0
; WASM32: get_local $push52=, 5
; WASM32: i32.const $push5=, 40
; WASM32: i32.add $push6=, $pop52, $pop5
; WASM32: i64.load $push33=, 0($pop6)
; WASM32: tee_local $push32=, 1, $pop33
; WASM32: get_local $push53=, 5
; WASM32: i64.load $push3=, 0($pop53)
; WASM32: get_local $push54=, 5
; WASM32: i64.load $push2=, 16($pop54)
; WASM32: i64.add $push4=, $pop3, $pop2
; WASM32: i64.add $push31=, $pop32, $pop4
; WASM32: tee_local $push30=, 3, $pop31
; WASM32: i64.store 8($pop55), $pop30
; WASM32: get_local $push62=, 0
; WASM32: get_local $push56=, 2
; WASM32: i64.const $push29=, 0
; WASM32: i64.ne $push8=, $pop56, $pop29
; WASM32: get_local $push57=, 4
; WASM32: i64.const $push28=, 0
; WASM32: i64.ne $push7=, $pop57, $pop28
; WASM32: i32.and $push9=, $pop8, $pop7
; WASM32: get_local $push58=, 5
; WASM32: i64.load $push10=, 8($pop58)
; WASM32: i64.const $push27=, 0
; WASM32: i64.ne $push11=, $pop10, $pop27
; WASM32: i32.or $push12=, $pop9, $pop11
; WASM32: get_local $push59=, 5
; WASM32: i64.load $push13=, 24($pop59)
; WASM32: i64.const $push26=, 0
; WASM32: i64.ne $push14=, $pop13, $pop26
; WASM32: i32.or $push15=, $pop12, $pop14
; WASM32: get_local $push61=, 3
; WASM32: get_local $push60=, 1
; WASM32: i64.lt_u $push16=, $pop61, $pop60
; WASM32: i32.or $push17=, $pop15, $pop16
; WASM32: i32.store8 16($pop62), $pop17
; WASM32: get_local $push63=, 5
; WASM32: i32.const $push20=, 48
; WASM32: i32.add $push21=, $pop63, $pop20
; WASM32: set_global __stack_pointer@GLOBAL, $pop21
start:
%0 = tail call { i128, i1 } @llvm.umul.with.overflow.i128(i128 %l, i128 %r) #2
%1 = extractvalue { i128, i1 } %0, 0
%2 = extractvalue { i128, i1 } %0, 1
%3 = zext i1 %2 to i8
%4 = insertvalue { i128, i8 } undef, i128 %1, 0
%5 = insertvalue { i128, i8 } %4, i8 %3, 1
ret { i128, i8 } %5
}
; Function Attrs: nounwind readnone speculatable
declare { i128, i1 } @llvm.umul.with.overflow.i128(i128, i128) #1
attributes #0 = { nounwind readnone uwtable }
attributes #1 = { nounwind readnone speculatable }
attributes #2 = { nounwind }
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