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https://github.com/c64scene-ar/llvm-6502.git
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dcc9291851
Summary: As a starting step, we only use one simple heuristic: if the sign bits of both a and b are zero, we can prove "add a, b" do not unsigned overflow, and thus convert it to "add nuw a, b". Updated all affected tests and added two new tests (@zero_sign_bit and @zero_sign_bit2) in AddOverflow.ll Test Plan: make check-all Reviewers: eliben, rafael, meheff, chandlerc Reviewed By: chandlerc Subscribers: chandlerc, llvm-commits Differential Revision: http://reviews.llvm.org/D4144 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211084 91177308-0d34-0410-b5e6-96231b3b80d8
135 lines
3.7 KiB
LLVM
135 lines
3.7 KiB
LLVM
; Test that the ffs* library call simplifier works correctly.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; RUN: opt < %s -mtriple i386-pc-linux -instcombine -S | FileCheck %s -check-prefix=CHECK-LINUX
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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declare i32 @ffs(i32)
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declare i32 @ffsl(i32)
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declare i32 @ffsll(i64)
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; Check ffs(0) -> 0.
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define i32 @test_simplify1() {
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; CHECK-LABEL: @test_simplify1(
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%ret = call i32 @ffs(i32 0)
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ret i32 %ret
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; CHECK-NEXT: ret i32 0
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}
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define i32 @test_simplify2() {
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; CHECK-LINUX-LABEL: @test_simplify2(
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%ret = call i32 @ffsl(i32 0)
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ret i32 %ret
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; CHECK-LINUX-NEXT: ret i32 0
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}
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define i32 @test_simplify3() {
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; CHECK-LINUX-LABEL: @test_simplify3(
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%ret = call i32 @ffsll(i64 0)
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ret i32 %ret
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; CHECK-LINUX-NEXT: ret i32 0
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}
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; Check ffs(c) -> cttz(c) + 1, where 'c' is a constant.
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define i32 @test_simplify4() {
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; CHECK-LABEL: @test_simplify4(
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%ret = call i32 @ffs(i32 1)
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ret i32 %ret
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; CHECK-NEXT: ret i32 1
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}
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define i32 @test_simplify5() {
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; CHECK-LABEL: @test_simplify5(
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%ret = call i32 @ffs(i32 2048)
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ret i32 %ret
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; CHECK-NEXT: ret i32 12
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}
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define i32 @test_simplify6() {
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; CHECK-LABEL: @test_simplify6(
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%ret = call i32 @ffs(i32 65536)
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ret i32 %ret
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; CHECK-NEXT: ret i32 17
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}
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define i32 @test_simplify7() {
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; CHECK-LINUX-LABEL: @test_simplify7(
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%ret = call i32 @ffsl(i32 65536)
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ret i32 %ret
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; CHECK-LINUX-NEXT: ret i32 17
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}
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define i32 @test_simplify8() {
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; CHECK-LINUX-LABEL: @test_simplify8(
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%ret = call i32 @ffsll(i64 1024)
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ret i32 %ret
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; CHECK-LINUX-NEXT: ret i32 11
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}
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define i32 @test_simplify9() {
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; CHECK-LINUX-LABEL: @test_simplify9(
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%ret = call i32 @ffsll(i64 65536)
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ret i32 %ret
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; CHECK-LINUX-NEXT: ret i32 17
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}
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define i32 @test_simplify10() {
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; CHECK-LINUX-LABEL: @test_simplify10(
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%ret = call i32 @ffsll(i64 17179869184)
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ret i32 %ret
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; CHECK-LINUX-NEXT: ret i32 35
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}
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define i32 @test_simplify11() {
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; CHECK-LINUX-LABEL: @test_simplify11(
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%ret = call i32 @ffsll(i64 281474976710656)
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ret i32 %ret
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; CHECK-LINUX-NEXT: ret i32 49
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}
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define i32 @test_simplify12() {
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; CHECK-LINUX-LABEL: @test_simplify12(
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%ret = call i32 @ffsll(i64 1152921504606846976)
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ret i32 %ret
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; CHECK-LINUX-NEXT: ret i32 61
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}
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; Check ffs(x) -> x != 0 ? (i32)llvm.cttz(x) + 1 : 0.
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define i32 @test_simplify13(i32 %x) {
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; CHECK-LABEL: @test_simplify13(
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%ret = call i32 @ffs(i32 %x)
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; CHECK-NEXT: [[CTTZ:%[a-z0-9]+]] = call i32 @llvm.cttz.i32(i32 %x, i1 false)
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; CHECK-NEXT: [[INC:%[a-z0-9]+]] = add nuw nsw i32 [[CTTZ]], 1
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; CHECK-NEXT: [[CMP:%[a-z0-9]+]] = icmp ne i32 %x, 0
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; CHECK-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[CMP]], i32 [[INC]], i32 0
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ret i32 %ret
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; CHECK-NEXT: ret i32 [[RET]]
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}
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define i32 @test_simplify14(i32 %x) {
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; CHECK-LINUX-LABEL: @test_simplify14(
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%ret = call i32 @ffsl(i32 %x)
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; CHECK-LINUX-NEXT: [[CTTZ:%[a-z0-9]+]] = call i32 @llvm.cttz.i32(i32 %x, i1 false)
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; CHECK-LINUX-NEXT: [[INC:%[a-z0-9]+]] = add nuw nsw i32 [[CTTZ]], 1
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; CHECK-LINUX-NEXT: [[CMP:%[a-z0-9]+]] = icmp ne i32 %x, 0
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; CHECK-LINUX-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[CMP]], i32 [[INC]], i32 0
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ret i32 %ret
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; CHECK-LINUX-NEXT: ret i32 [[RET]]
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}
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define i32 @test_simplify15(i64 %x) {
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; CHECK-LINUX-LABEL: @test_simplify15(
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%ret = call i32 @ffsll(i64 %x)
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; CHECK-LINUX-NEXT: [[CTTZ:%[a-z0-9]+]] = call i64 @llvm.cttz.i64(i64 %x, i1 false)
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; CHECK-LINUX-NEXT: [[INC:%[a-z0-9]+]] = add nuw nsw i64 [[CTTZ]], 1
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; CHECK-LINUX-NEXT: [[TRUNC:%[a-z0-9]+]] = trunc i64 [[INC]] to i32
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; CHECK-LINUX-NEXT: [[CMP:%[a-z0-9]+]] = icmp ne i64 %x, 0
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; CHECK-LINUX-NEXT: [[RET:%[a-z0-9]+]] = select i1 [[CMP]], i32 [[TRUNC]], i32 0
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ret i32 %ret
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; CHECK-LINUX-NEXT: ret i32 [[RET]]
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}
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